Quaternary salts of dialkylaminobenzamides
This application is a continuation-in-part of Ser. No. 08/111,690, filed Aug. 25, 1993. 
    
    
     In one aspect the present invention relates to novel substantive compounds for skin, hair, paints, textiles and fibers of wool, cotton, silk and synthetics which provide protection from the undesirable affects of sunlight. In another aspect the invention relates to the use of such compounds as sunscreens in personal care or in other formulations. 
     BACKGROUND OF THE INVENTION 
     In addition to the recognized detrimental affects of sunlight on printed or colored fabrics and painted surfaces, human hair damage caused by sunlight in the ultraviolet spectrum is more severe than that resulting from all other factors such as weather, wind, atmospheric pollution, salt water, chlorinated water, perming, coloring, bleaching and improperly applied or repetitive treatments. Notwithstanding the need for effective sunscreens, none have been developed which provide desired hair substantivity while avoiding other deleterious changes in structure, brittleness, hair softness and the like. Prior attempts to remedy these problems have proven unsatisfactory. For example, U.S. Pat. Nos. 3,879,443; 3,878,229; 4,069,309 and 4,680,144 disclose various sunscreens dependent on an ester functionality. However, these compounds tend to be hydrolytically unstable to the extent that the formulator must avoid conditions conducive to hydrolysis during formulation. Also, since these esters lack hydrogen bonding capability with skin protein or hair keratin, their hair substantivity are not satisfactory. 
     U.S. Pat. No. 4,256,664 pertains to quaternized salicylamides; however, these compounds have poor dispersibility and have shown skin irritation. Further, the primary amines of this patent oxidize rapidly in air, thereby altering desired hair color and, in some instances, form nitroso amines some of which are known carcinogens. Finally, these amine compounds are subject to intermolecular and solvent hydrogen bonding which characteristic causes a significant shift in UV maxima absorption and reduces absorption in the desired spectrum range. 
     M. F. Saettone et al. in THE INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 8, 9-25, 1986, describes types of amido quaternaries based on salicyclic and cinnamic acids. The salicylamides are ortho substituted with spatial arrangements permitting internal molecular hydrogen bonding. The ortho relationship of the phenolic group to the bulky amide group causes steric hindrance and stress within the molecule. To counter this steric effect, the groups which deviate slightly from planarity are present. However, any minor deviation from planarity causes a reduction in the extinction coefficient and hence a corresponding reduction in the efficacy of protection against harmful sun rays. On the other hand, cinnamoylamides have additional unsaturation and conjugation with respect to both the aromatic ring and the carbonyl group. This structure permits electron delocalization to take place within the molecule; but, although the energy corresponding to this electron transition corresponds to a desired wavelength of about 305 nm, the molar extinction coefficient is materially lower than that for the corresponding para-dimethylamino carbonyl analog. Finally, the cinnamoyl compounds are subject to cis-trans isomerization as well as to oxidative cleavage and polymerization, i.e. characteristics to be avoided for effective sunscreens. 
     Still another patent, U.S. Pat. No. 4,061,730, seeks to remedy the above problems by the use of quaternized benzylidene camphor sunscreens. However, since quaternization eliminates conjugation in the compound, the sun protection efficiency is significantly reduced. 
     From the above discussion, it will be appreciated that the discovery of a commercially viable and hair substantive sunscreen is remote. 
     Accordingly, it is an object of the present invention to provide an effective, non-irritating sunscreening agent which is not subject to hydrolysis, and which has high substrate substantivity 
     Another object of the invention resides in the synthesis of said sunscreening agent. 
     Still another object is to provide a novel water insoluble sunscreening agent for extended use in hair care. 
     These and other objects will become apparent from the following description and disclosure. 
     THE INVENTION 
     In accordance with the present invention, a substantially water insoluble, non-irritating and hydrolysis resistant cationic sunscreening agent is provided which possesses high molecular planarity and which is easily incorporated into commercial formulations to provide stable compositions. 
     The present benzamide derivatives can be employed to prevent color alteration in paints or painted substrates, e.g. automotive vehicles and mono or multi colored textile fabrics, and the like. Because of their high hair, skin and wool substantivity, the present compounds are particularly useful in cosmetic applications, as in hair conditioning shampoos, silicone containing softeners, hair conditioners and rinses, styling mousses, gels or lotions, hair sprays, hair dyes and bleaching compositions. Since the present compounds interact with hair protein, they provide UV protection and conditioning properties long after hair treatment. Beneficial cosmetic applications also include their compatability with and easy incorporation into skin care compositions, such as sun protection creams and lotions to inhibit skin ageing, wrinkle formation, erythema and carcinogenesis as well as in nail polish, lipstick, rouge or make-up bases. The benzamide derivatives of this invention also reduce fading of natural and synthetic dyes and minimize or eliminate photodegradation in dyed and undyed cotton, linen, silk and wool fabrics as well as color alteration in paints and painted surfaces exposed to climatic conditions as in automotive and house paints. 
     The non-hydrolyzable, non-irritating, substantive derivatives of this invention are quaternary ammonium salts of a para-dialkylamino aminobenzamide compound having the formula ##STR2## wherein R&#39; and R&#34; are each selected from the group of C 1  to C 2  alkyl; n is an integer having a value of from 2 to 4; R is a linear, branched or cyclic alkyl radical having from 10 to 18 carbon atoms and R 1  and R 2  are each selected from the group of C 1  to C 2  alkyl. It is to be understood that mixtures of the present benzamides can be employed in a composition to provide combined UV protection. 
     Of the above benzamide compounds, most preferred are those wherein R is alkyl having 12 carbon atoms and R&#39;, R&#34;, R 1  and R 2  are each methyl. 
     The present compounds are unique in that they absorb UV in wavelengths of from about 280 to about 330 nm and possess a molecular extinction coefficient of up to about 30,000. The present compounds are generally compatible with any composition requiring UV protection and can be added in an effective amount of between about 0.5 and about 10 wt. %, preferably between about 1 and about 3 wt. %, based on total composition. 
     Solutions of the present compounds are also usefully applied as a separate coating over a treated substrate. For example, a vehicle or aircraft can be sprayed or brushed, with a 2 to 10% solution of the present compound dissolved in a suitable solvent such as fatty alcohols, e.g. octyldodecanol, isocetyl alcohol, alkyl lactates containing 12 to 18 carbon atoms, 2-ethylhexyl p-dimethylamino benzoate (Padimate O), etc. The compound can also be pressed into a cosmetic cake as in a cake powder for application to the skin. 
     The benzamides of the present invention are easily synthesized according to the following two-stage reaction ##STR3## wherein A is C 1  to C 8  alkyl and the quaternizing agent is halogen, an anion forming organic moiety, e.g. alkyl tosylate, alkyl sulfonate, etc. 
     Stage 1 of the reaction is carried out at a temperature of between about 90° and about 180° C., preferably under reflux conditions for continuous removal of the alkanol by-product. The reaction of the aminobenzoate with diamine is conducted in the presence of a base catalyst such as dimethyl formamide, triethanol amine, N-methyl-morpholine, hexamethylene tetraamine, dimethylamino-2-hydroxy propane, 2,4,6-tris(dimethylaminomethyl)phenol, potassium t-butoxide, KOH, NaOH, NaOCH 3 , NaOC 2  H 5  and the like. Between about 0.5 and about 24 hours, in the presence of from about 0.1 to about 2 weight % of the base catalyst, is sufficient to complete the reaction to the aminobenzamide product in a high yield greater than 96%. Preferred conditions for this stage of the reaction include a temperature of from about 120° to about 170° C. for a period of between about 1 and about 5 hours. The aminobenzoate and diamine can be reacted as a melt or in a 15-50%, preferably a 20-30%, solids solution or emulsion in a suitable liquid medium provided by, e.g. acetone, methyl ethyl ketone, ethyl acetate, cyclohexane, octane, xylene, toluene, etc. and mixtures thereof. Also, the reaction can be effected under a pressure sufficient to maintain a liquid phase when needed. 
     The quaternization stage is carried out at a temperature of between about 70° and about 140° C., preferably between 100° and 130° C., and is completed within a period of from about 10 minutes to about 24 hours, more often 1 to 6 hours, after which the product can be recovered by crystallization, from ethyl acetate or a similar solvent. Although the product can be recovered in crystalline form, these crystals may contain up to 10 wt. % water, more desirably between about 1 and about 8 wt. % water. 
     The quaternizing agents employed in the present invention include C 10  to C 18  alkyl- halide, sulfate, sulfonate, acetal and aryl sulfonates, e.g. p-tolyl sulfonate. The alkyl moiety of the quaternizing agent can be branched or linear. Preferred quaternizing agents are those containing from 12 to 14 carbon atoms in the alkyl moiety. 
     In the above reactions, equimolar amounts of the reacting species are preferred; however, ratios of from about 1:2 to about 2:1 may be employed in the second stage reaction. 
     Advantages of the present sunscreening agents are derived from the aromatic --N(R) 2  group, which unlike HO--C 6  H 4  -- or --NH 2 , is stable, is not sensitive to pH changes present in various formulations, and is not oxidized in air. The substitution of --N(R) 2  in the para-position on the phenyl ring also eliminates H bonding with protic solvents which characterize the ortho --OH and --NH 2  phenyl substitutions of other sunscreens while the replacement of the ester linkage found in prior compounds with an amide linkage provides an additional binding site for the hair protein (keratin) through H-bonding. The presence of the quaternary amine group provides the salt linkage through the electrovalent union of the side chain acid keratin residues thereby imparting conditioning properties. All of the above factors in combination provide the synergistic effects and benefits of the present sunscreens. 
     Formulations containing the present quaternized amino-benzamide compounds can be used in pump or aerosol sprays. 
     The cosmetic formulations incorporating the present sunscreens generally include between about 40 and about 90 wt. % of a carrier or propellant such as deionized water, alcohol, isobutane or propane, etc., between about 10 and about 40 wt. % of a surfactant or surfactant mixture such as sodium and/or ammonium, lauryl sulfate, sodium laureth sulfate etc., and fragrance and/or coloring agent as desired. 
     These formulations may optionally contain between about 5 and about 50 % of one or more inert components including a film forming polymer such as a C 1  to C 4  ester of a methyl vinyl ether/maleic anhydride copolymer, a vinyl pyrrolidone/vinyl acetate copolymer, etc.; a preservative such as bronopol, an ester of p-hydroxybenzoic acid, 2-methyl-3(2H) isothiazolone, a mixture of methyl and propyl paraben, dimethyl-5,5-dimethylhydantoin, Germall® 115, imidazolidinyl urea, etc.; a sequestrant, and an antistatic agent. 
     Following compilation of formulations serves to illustrate the diversity of formula types currently available in the marketplace. In each of the formulations the sunscreen of the present invention is employed. 
     
         ______________________________________                                    
    Ingredients                 % w/w                                     
______________________________________                                    
A.  Formula type: FACE CREAM                                              
    Phase A                                                               
    Benzophenone-3              8.0                                       
    Sunscreen                   6.0                                       
    Cyclomethicone              10.0                                      
    Glyceryl stearate SE        5.0                                       
    Phenyldimethicone           2.0                                       
    Cetearyl alcohol (and) ceteareth-20                                   
                                2.0                                       
    Cetyl alcohol               1.0                                       
    Octyl palmitate             10.0                                      
    Phase B                                                               
    Water                       QS                                        
    Preservative                QS                                        
    Glycerine                   5.0                                       
    Diethanolamine p-methoxycinnamate                                     
                                8.0                                       
    Titanium dioxide            3.0                                       
    Xanthan                     0.2                                       
    Hydroxyethylcellulose       0.1                                       
    Phase C                                                               
    Fragrance                   0.3                                       
B.  Formula type: w/o WATER-RESISTANT                                     
    CREAM                                                                 
    Phase A                                                               
    Mineral oil (and) lanolin alcohol                                     
                                5.0                                       
    Isopropyl palmitate         10.0                                      
    Beeswax                     8.0                                       
    Sorbitan sesquioleate       2.0                                       
    Mineral oil                 25.0                                      
    Sunscreen                   6.0                                       
    Benzophenone-3              4.0                                       
    Phase B                                                               
    Water                       QS                                        
    Borax                       0.4                                       
    Preservative                QS                                        
    Propylene glycol            5.0                                       
    Phase C                                                               
    Fragrance                   0.25                                      
______________________________________                                    
    Ingredient                  % w/w                                     
______________________________________                                    
C.  Formula type: SUN BLOCK CREAM                                         
    Phase A                                                               
    Isopropyl myristate         9.0                                       
    Sunscreen                   10.0                                      
    Benzophenone-3              5.0                                       
    Menthyl anthranilate        5.0                                       
    Stearic acid XXX            5.0                                       
    Glyceryl monostearate       6.0                                       
    Cetyl alcohol               5.0                                       
    PEG-40 stearate             2.0                                       
    Phase B                                                               
    Water                       QS                                        
    Xanthan                     0.3                                       
    DEA-cetyl phosphate         8.0                                       
    Preservative                QS                                        
    Glycerine                   3.5                                       
    Phase C                                                               
    Fragrance                    0.25                                     
D.  Formula type: WATER-PROOF LOTION                                      
    Expected SPF: 15                                                      
    Phase A                                                               
    Sunscreen                   8.0                                       
    Benzophenone-3              4.0                                       
    Myristyl myristate          1.0                                       
    Propylene glycol dipelargonate                                        
                                5.0                                       
    Steareth-20                 1.0                                       
    Phase B                                                               
    Water                       QS                                        
    Carbomer 1342               0.2                                       
    Preservative                QS                                        
    Propylene glycol            5.0                                       
    Phase C                                                               
    PEG-15 cocamine             0.2                                       
    Phase D                                                               
    Fragrance                    0.25                                     
E.  Formula type: CATIONIC SUNSCREEN                                      
    LOTION                                                                
    Phase A                                                               
    Glycol stearate             5.0                                       
    C.sub.12 -15 alcohols benzoate                                        
                                3.5                                       
    Sunscreen                   5.0                                       
    PEG-40 stearate             1.5                                       
    Phase B                                                               
    Water                       QS                                        
    Preservative                QS                                        
    Stearamidopropyl PG-dimonium chloride                                 
    Phosphate                   3.5                                       
    Glycerine                   4.0                                       
    Phase C                                                               
    Fragrance                   0.3                                       
F.  Formula type: GREASELESS SUNSCREEN                                    
    OIL                                                                   
    Benzophenone-3              3.0                                       
    Sunscreen                   7.0                                       
    Mineral Oil                 QS                                        
    Octyl palmitate             15.0                                      
    Fragrance                   0.3                                       
    Sesame Oil                  1.0                                       
    BHA                         0.1                                       
G.  Formula type: SUNSCREEN OIL                                           
    Comments: Octyl palmitate reduces oiliness of                         
    mineral oil while minimizing UV curve shift                           
    Expected SPF: 3                                                       
    Sunscreen                   4.0                                       
    Octyl palmitate             QS                                        
    Lauryl lactate              15.0                                      
    Mineral oil                 35.0                                      
    Isocetyl alcohol            10.0                                      
    Fragrance                   1.0                                       
H.  Formula type: LIP BALM STICK                                          
    Sunscreen                   7.0                                       
    Benzophenone-3              3.0                                       
    Castor oil                  QS                                        
    Octyldodecanol              5.0                                       
    Beeswax                     15.0                                      
    Ozokerite                   6.0                                       
    Myristyl lactate            4.0                                       
    Candililla wax              6.0                                       
    Petrolatum                  5.0                                       
    Fragrance                   0.5                                       
I.  Formula type: Water-resistant sunscreen mousse                        
    Phase A                                                               
    Dimethicone                 10.0                                      
    Sunscreen                   3.5                                       
    Benzophenone-3              3.0                                       
    Glyceryl PABA               3.0                                       
    Stearic acid XXX            4.0                                       
    Cetyl alcohol               0.5                                       
    Vitamin E acetate           0.1                                       
    Phase B                                                               
    Water                       QS                                        
    Hydroxypropyl cellulose     0.5                                       
    Triethanolamine 99%         0.5                                       
    Ethanol                     20.0                                      
    Preservative                QS                                        
J.  Formula type: Sunscreen mousse                                        
    Water                       QS                                        
    Propylene glycol            5.0                                       
    Quaternium-26               3.0                                       
    Octyl methoxy cinnamate     3.0                                       
    Cetearyl alcohol (and) ceteareth-20                                   
                                1.0                                       
    Octyldodecanol              5.0                                       
    Preservative                QS                                        
K.  Formula type: MAKE-UP MOUSSE                                          
    Phase A                                                               
    Glyceryl dilaurate          2.5                                       
    Glyceryl stearate SE        3.0                                       
    Cetyl alcohol               1.5                                       
    Decyl oleate                2.5                                       
    Propylene glycol depelargonate                                        
                                3.0                                       
    Sunscreen                   3.5                                       
    Phase B                                                               
    Water                       QS                                        
    Hydroxyethylcellulose       0.5                                       
    Sorbitol 70%                5.0                                       
    Pigment                     15.0                                      
    Preservative                QS                                        
    Phase C                                                               
    Ethanol                     20.0                                      
L.  Formula type: SUNSCREEN GELEE                                         
    Myristyl lactate            5.0                                       
    Tridecylneopentanoate       10.0                                      
    Sunscreen                   4.0                                       
    Petrolatum                  QS                                        
    Paraffin                    5.0                                       
    Beeswax                     4.0                                       
    Calcium stearate            5.0                                       
    Cetearyl alcohol            2.0                                       
    Fragrance                   1.0                                       
    Preservative                QS                                        
M.  Shampoo                     Parts                                     
    Emersol 6400 (sodium lauryl sulfate)                                  
                                30.0                                      
    Rewomid DC-212/S (Cocamide DEA)                                       
                                5.0                                       
    Deionized water             60                                        
    Preservative                QS                                        
    Sunscreen                    4                                        
    Preparation: Heat all ingredients to 45-50° C.;                
    cool to room temperature                                              
N.  Hair Conditioner                                                      
    A.    Sunscreen                 2.0%                                  
          Cetyl Alcohol             2.0%                                  
          Ethoxylated Sorbitan Esters                                     
                                    4.0%                                  
    B.    Water                     92.0%                                 
    Preparation: Heat both phases to 80° C.; add A to              
    B with stirring and continue for 1 hour. Cool to                      
    room temperature.                                                     
______________________________________                                    
O.  Conditioning Shampoo Formulation,                                     
    taken from Example 7 of U.S. Pat. No. 5,078,990,                      
    which are incorporated herein as representative                       
    teachings of suitable formulations for addition of                    
    the present sunscreens.                                               
______________________________________                                    
ITEM    COMPONENT            WT. %                                        
______________________________________                                    
1       ammonium lauryl sulfate                                           
                             6.0                                          
2       ammonium laureth sulfate                                          
                              9.45                                        
        (1 mole EO)                                                       
3       sodium lauryl sulfate                                             
                             4.5                                          
4       distearyl dimethyl   0.3                                          
        ammonium chloride                                                 
        (AROSURF ®)                                                   
5       distearyl phthalamic acid                                         
                             3.5                                          
6       sodium hydroxide      0.085                                       
7       FD&amp;C Blue #1           0.00024                                    
8       D&amp;C yellow #10         0.0012                                     
9       tetrasodium EDTA/water softener                                   
                             0.2                                          
10      fragrance            0.5                                          
11      DMDM hydantoin       0.1                                          
        (GLYDANT ®) preservative                                      
12      methyl &amp; methylchloro                                             
                              0.05                                        
        isothiazolinone-preservatives                                     
13      33% SE-30 polysiloxane                                            
                             2.5                                          
        gum/67% SF96-350                                                  
        polysiloxane oil                                                  
14      sunscreen            0.8                                          
15      soft water           QS to 100                                    
Add items #1, #2, and #3 and begin heating batch to                       
180° F.-185° F.                                             
At 180° F. add item #4 and allow to completely mix in.             
Add items #5, allow to mix in.                                            
Add item #6, #7, and #8.                                                  
Allow to mix for 30 minutes at 180° F.-185° F.              
After this time, samples should be cooled with item #15.                  
______________________________________                                    
 
    
     The conditioning agent (item 13) and sunscreen (14) then are added and mixed at a temperature of at least 30° C. and preferably at 40° C. to 50° C. The composition at this point exhibits lower frequency stretching bands at the higher temperatures and the conditioning agent is easily dispersed or dissolved within the emulsion without separation. 
     
         ______________________________________                                    
Components              wt. %                                             
______________________________________                                    
Automotive Acrylic Enamel                                                 
TiO.sub.2 base containing 60% pigment                                     
                        220                                               
Color tinting base      40                                                
Acrylic polymer (with pendant                                             
                        350                                               
--OH and --COOH groups) 55% solids                                        
Butoxy methylol melamine-                                                 
                        230                                               
formaldehyde resin - 55% solids                                           
Butyl alcohol           37                                                
Toluene sulfonic acid 50% in xylene                                       
                        2.6                                               
Xylene                  75.0                                              
Sunscreen               5.4                                               
Propylene glycol methyl ether acetate                                     
                        40.0                                              
                        100.00                                            
Total solids            45 wt. %                                          
Pigment solids          25 wt. %                                          
Crosslinker of polymer  30%                                               
White Aircraft TopCoat                                                    
1:1 Aliphatic isocyanate-polyester                                        
                        20.0                                              
polyol resin                                                              
TiO.sub.2 (R960 Exterior grade)                                           
                        16.0                                              
Urethane catalyst       2.0                                               
Flow/leveling/flood and float additives                                   
                        2.0                                               
Sunscreen               10.0                                              
Mixture of methyl ethyl ketone, methyl                                    
                        50.0                                              
isobutyl ketone and methyl allyl ketone                                   
______________________________________                                    
 
    
     Having generally described the invention, reference is now had to the accompanying Examples which illustrate preferred embodiments but which are not to be construed as limiting to the scope of the invention as more broadly defined above and in the appended claims. 
    
    
     EXAMPLE 1 
     Preparation of N- (3-Dimethylaminopropyl)-p-dimethylamino benzamide 
     Ethyl-p-dimethylaminobenzoate (164.9 g, 0.85 mole), 3-dimethylaminopropylamine (95.9 g, 0.94 mole) and sodium methoxide (2.8 g, 0.054 mole) were introduced into a 4-neck, 500 ml glass reactor, equipped with stirrer, heater, nitrogen purge and deflegmator with a Dean-Stark device. The charged reactor was flushed with dry nitrogen for 15 minutes at ambient temperature and was then heated to 150° C. under vigorous stirring. After about 15 minutes accumulation of distillate, the reactor temperature was gradually increased to 170° C. in 5° increments over a period of 1 hour and was then maintained at 170° C. for an additional hour, whereupon a sample of the product, analyzed by glass chromatography (GC) indicated 99+% conversion of the ester. 
     The resulting mixture was then cooled to 95° C. and washed twice with 200 ml of hot water after which the aqueous phase was cooled to room temperature and precipitated crystals recovered by filtration. These crystals were then combined with the organic phase in the reactor. 
     A vacuum of about 10-20 mm Hg was then applied to the product in the reactor which was heated to 90°-95° C. for 30 minutes. The resulting distillate containing water and light products was discarded. The residue was cooled to room temperature and was identified by elemental analysis,  1  H and  13  NMR and FTIR spectra, as N-(3-dimethylamino- propyl)-p-dimethylaminobenzamide. The product yield was 205 g (96.9% of theoretical based on ethyl-p-dimethylamino-benzoate). 
     EXAMPLE 2 
     Preparation of Stearyl-[3- (p-dimethyaminobenzamido ) ethyl]-Dimethylammonium p-toluenesulfonate 
     N-(3-dimethylaminoethyl)-p-dimethylaminobenzamide (77 g, 0.31 mole) prepared as in Example 1, except that dimethylamino ethyl amine is substituted for dimethylamino propyl amine and 131.5 g of stearyl-p-toluenesulfonate (0.31 mole) was heated to 110° C. under a blanket of nitrogen with continuous stirring for 2 hours. The resulting melt was dissolved in 800 ml of hot ethylacetate and then crystallized by cooling to ambient temperature. The crystals were recovered by filtration, dried in air and then under vacuum at 50°°60° C. The resulting whitish crystals of stearyl-[3-(p-dimethylaminobenzamido)ethyl]dimethyl ammonium p-toluenesulfonate were found to have a melting point of 122°-125° C. and the yield 191.8 g, was 92% of theoretical. The structure and purity of the product were confirmed by elemental analysis, NMR, FTIR and UV spectra. 
     EXAMPLE 3 
     Preparation of Hexadecyl-[3-p-dimethylaminobenzamido)ethyl]-dimethylammonium p-toluenesulfonate 
     The synthesis as described in Example 2 was repeated except that 122.8 g of hexadecyl-p-toluene sulfonate (0.31 mole) was used as the quaternizing agent. The quaternized product yield was 181.8 g (91% of theoretical). 
     EXAMPLE 4 
     Preparation of Dodecyl-[3-(p-dimethylaminobenzamido)propyl]-dimethylammonium p-toluenesulfonate 
     The synthesis as described in Example 1 was repeated except that 105.4 g of dodecyl-p-toluene sulfonate (0.31 mole) was used as the quaternizing agent and the quaternized product was crystallized from 1000 ml of methylethylketone. The yield was 149.6 g (82% of theoretical). 
     EXAMPLE 5 
     Demonstration of Substantivity 
     In order to demonstrate the substantivity and effectiveness of the present compounds to human hair, the following tests were carried out on the compounds of Examples 2 and 4. These were compared with benzylidene camphor para-toluene sulfonate (A) and 4-[(2-oxo-3-bornylidene)methyl]-phenyldimethyldodecylammonium paratoluene sulfonate (b) as disclosed in U.S. Pat. No. 4,061,730 and octyl-para-dimethylamino benzoate (C). 
     The test samples were prepared with 1 gram of human hair in a solution of 0.01% in water or isopropanol-water and using 50 ml of total solution. After standing for 2 minutes the hair was removed from the solution. 
     The substantivity of a sunscreening agent is determined in mg. of sunscreen absorbed/gram of hair, by substracting the absorbance at the maximum peak between 300 and 320 nm before and after dipping the hair in the solution containing the sunscreen. The results are as shown in Table I. 
     
                       TABLE I                                                     
______________________________________                                    
             Amount (in mg) of                                            
                           Percentage of                                  
             Sunscreen     Sunscreen                                      
             Absorbed per gm                                              
                           Absorbed on                                    
Compound     of Hair       Hair                                           
______________________________________                                    
Comparative A                                                             
             0             0                                              
Comparative B                                                             
             0             0                                              
2            4.1           41                                             
4            6.2           62                                             
______________________________________                                    
 Comparative A is methoxy cinnamate diethanol amine salt.                 
 Comparative B is 2hydroxy-4-methoxy benzophenone5-sulfuric acid          
 neutralized with NaOH.                                                   
 
    
     EXAMPLE 6 
     Demonstration of Hair Fading Reduction/Elimination 
     In order to demonstrate the effectiveness of the present compounds in reducing or elimination of the fading of dyed human hair, the following tests were carried out. Compounds of Examples 2 and 4 were selected for this study and octyl-p-dimethylamino-benzoate (C) was used as a comparative sunscreen. The test samples were prepared with 1 gram of dyed human hair in a solution (50 ml) of 0.01% in water or isopropanol-water. After standing for 10 minutes the hair was removed from the solution, one half was air dried, and the other half was rinsed for 5 minutes in tap water and then dried. Untreated dyed human hair was used as a control. 
     All test samples were irradiated with a Hanovia Ultra Violet Lamp containing a Corex D filter. It was found that at 72 hours, significant fading in both the octyl-p-dimethylaminobenzoate and control samples occurred. No fading of hair in the samples containing the sunscreens of Examples 2 and 4 took place. 
     The rinsed samples containing 2 and 4 sunscreens also retained about 80% of their fade resistance. 
     EXAMPLE 7 
     Demonstration of Hair Protection Against Sun Damage 
     The purpose of this study was to assess the ability of the products of this invention (Examples 2 and 4) to reduce the amount of ultraviolet light-induced damage to the hair, as measured by the change in fluorescence of mercurochrome-dyed hair samples. For this study, the sunscreen compounds were each dissolved in lauryl lactate (Ceraphyl 31) at 1 and 2% (W/W) level concentration. 
     The procedure followed in this study involves forming a base stain solution 1% mercurochrome in 6M urea containing 0.5% of aqueous Triton X-100* (Q.S. to 100 ml). 
     Degreased hair swatches are taken from 10 female subjects, 7 of which are permed or colored hair and 3 of which are virgin hair. The hair is cut 1/4&#34; from the scalp and the proximal 3&#34; used for study. 
     A first portion of the hair strands from each subject is dipped into the base stain solution to which the sunscreen solution has been added. 
     A second equal portion of the hair strands from each subject is dipped into the base stain solution without addition of the sunscreen solution and the first and second portions are irradiated. Finally, a third equal portion of the hair strands from each subject is untreated and used as an absolute control to determine the amount of fluorescence inherent in the hair. 
     Measurement of fluoroescence is carried out by mounting three hair strands of a given sample on a microscope slide cross section. A fluorescence microscope Zeiss 2FL fitted with a photomultiplier tube (PMT) EM1#9798E and a filter measures fluorescence of the strands under -600 volts supplied by a Harrison 6515A DC supplier. 
     The results of these tests are reported in the following Table II. 
     
                       TABLE II                                                    
______________________________________                                    
             Fluorescence Units                                           
                         % Decrease in                                    
             (Average of 10                                               
                         Fluorescence                                     
             Sample Subjects)                                             
                         and Control                                      
______________________________________                                    
Hair samples treated with                                                 
               16.22         55.61                                        
Sunscreen of Example 2                                                    
(1% soln)                                                                 
Hair samples treated with                                                 
               18.30         51.92                                        
Sunscreen of Example 4                                                    
(1% soln)                                                                 
Hair samples treated with                                                 
               12.10         68.71                                        
Sunscreen of Example 2                                                    
(2% soln)                                                                 
Hair samples treated with                                                 
               13.55         64.91                                        
Sunscreen of Example 4                                                    
(2% soln)                                                                 
Hair samples in Ceraphyl                                                  
               44.89         30.46                                        
31 solution irradiated                                                    
without sunscreen                                                         
Hair samples irradiated in                                                
               38.71         25.0                                         
the absence of Ceraphyl 31                                                
and/or sunscreen                                                          
______________________________________                                    
 
    
     The following represent some other formulations using the sunscreen agents of this invention and illustrate their compatability with a variety of components conventionally employed in such compositions. 
     EXAMPLE 8 
     Formulation of Hair Styling Mousse with Sun Protection 
     
         ______________________________________                                    
1.     Water               85.5%                                          
2.     Gafquat 755N        2.0%                                           
3.     Ethoxylated Sorbitol Esters                                        
                           2.0%                                           
4.     Ethanol             5.0%                                           
5.     Preservative        1.0%                                           
6.     Sunscreen from Example 2 or 4                                      
                           1.5%                                           
7.     Propellant                                                         
       Dimethyl Ether      4.0%                                           
       n-Butane            4.0%                                           
______________________________________                                    
 
    
     Ingredient 2 above was added to water and heated to 55° C. with constant agitation until homogeneous, after which ingredients 3, 4 and 6, which had been mixed in a separate vessel until clear, were added with stirring for 1 hour and cooled. The preservative was then added and the resulting mixture introduced into an aerosol can with propellant. 
     EXAMPLE 9 
     Conditioning Hair Styling Gel and Sunscreen 
     A. Crosslinked methyl vinyl ether/maleic anhydride copolymer (6.0 wt. %) was dispersed in 80.2 wt. % of distilled water by mixing for about 45 minutes at about 87° C. The dispersion was then cooled to 60° C. and 0.4 wt. % of sodium hydroxyethyl glycinate followed by 7 wt. of deionized water was added while cooling to room temperature. 
     Hair Fixative 
     B. A separate mixture of 1 wt. % polyvinylpyrrolidone in 7 wt. % deionized water was prepared at room temperature and a dispersion consisting of 1.0 wt. % compound of Example 4 and 10.0 wt. % of polyethoxylated sorbitan monolaurate (Tween 20) was added with mixing to the aqueous polyvinylpyrrolidone phase at 70° C. The resulting mixture was then added to the crosslinked copolymer phase at 70° C. and mixing was continued while cooling to 25° C. 
     This formulation possesses excellent hair holding power while providing protection against sun damage. 
     EXAMPLE 10 
     Hair Conditioner for Dyed Hair 
     A dispersion of modified hydroxyethyl cellulose (0.75 wt. %) in 88.03 wt. % deionized water, 1.0 wt. % polyethoxylated sorbitan monolaurate and 0.50 wt. % phenoxyethanol was prepared at 85° C. To this dispersion was gradually added, at about 90° C. a premixed solution of 0.25 wt. % methylparaben, 0.25 wt. % propylparaben in 3.72 wt. % water. After mixing to uniformity, 2.0 wt. % glycol stearate, 1.0 wt. % mink amidopropyl dimethyl-2-hydroxyethyl ammonium chloride, 0.25 wt. % cetyl alcohol, 1.0 wt. % stearyl alcohol, and 1.0 wt. % of the compound of Example 2 were added in the above order and mixed for 10 minutes and then homogenized for 10 minutes at between about 80°-90° C. The resulting uniform mixture was then cooled to room temperature. This conditioning lotion when applied to dyed hair provides protection against hair surface damage due to exposure to the sun. 
     The hair substantivity of 1 g water wetted swatches European hair were subjected to spectrophotometric analysis which involved wetting the hair with 1.43 g of a saturated solutions of sunscreening agents shown in the table following Example 11 in 1,800 ml distilled water which was mixed and protected against light for 12 hours. The hair swatches were soaked in the solution for 1 minute and then dried, after which 5 ml of the remaining solution was transferred to a 100 ml volumetric flask, and diluted to volume with isopropyl alcohol. 
     Another 5 ml of solution into which no hair was soaked was then similarly prepared by dilution to volume with isopropyl alcohol in a 100 ml flask. The spectrophotometer was then set up to read absorbance of each solution in the 200-400 nm range using isopropyl alcohol as a blank. 
     EXAMPLE 11 
     Substantivity to Hair 
     The effectiveness of a sunscreening agent is also determined by its substantivity to hair and bears a strong relation to hydrogen bonding, salt linkages, Van der Wall&#39;s forces as well as hydrophobic-hydrophilic balance of the molecule. The following substantivity data shows the superiority of the products obtained by present invention over the previously described art. 
     
         ______________________________________                                    
                       SUBSTANTIVITY                                      
                       (mg. product/gm                                    
COMPOUND               of hair)                                           
______________________________________                                    
Dodecyl[(p-dimethyl-                                                      
              Present compd                                               
                           6.6                                            
aminobenzamido)propyl]                                                    
dimethylammonium                                                          
tosylate                                                                  
Octyldodecyl [(p-                                                         
              Present compd                                               
                           4.4                                            
dimethylaminobenz-                                                        
amido) propyl]                                                            
dimethylammonium                                                          
tosylate                                                                  
Lauryl 3-dimethyl-                                                        
              U.S. Pat. No.                                               
                           3.7                                            
aminoethyl p-dimethyl-                                                    
              4,680,144                                                   
aminobenzoyl tosylate                                                     
Stearyl 3-dimethyl-                                                       
              U.S. Pat. No.                                               
                           2.6                                            
aminoethyl p-dimethyl-                                                    
              4,680,144                                                   
aminobenzoyl tosylate                                                     
Lauryl 3-salicylamido                                                     
              U.S. Pat. No.                                               
                           2.4                                            
propyl dimethyl                                                           
              4,256,664                                                   
ammonium bromide                                                          
Lauryl [(p-aminobenz-                                                     
              U.S. Pat. No.                                               
                           2.2                                            
amido) propyl]                                                            
              4,256,664                                                   
dimethylammonium                                                          
bromide                                                                   
______________________________________                                    
 
    
     EXAMPLE 12 
     Organic sunscreens are generally unsuitable for application to human hair because of inadequate substantivity as they tend to rinse-out of the hair and are accordingly ineffective. Previous attempts to remedy these shortcomings and have not proved effective for the following reasons: 
     Sunscreen Efficacy 
     The effectiveness of a sunscreening agent is determined by dividing the absorbance at the maximum peak between 300 and 320 nm by the concentration in grams per liter. This is known as the &#34;K&#34; value of a sunscreening agent. The higher the &#34;K&#34; value, the better the sunscreening ability and the lower the amount of material needed for protection from sun. In other words, from the &#34;K&#34; value the amount of sunscreening agent necessary for protection from the sun ultraviolet radiation can be determined and used in any cosmetically acceptable base preparation. The following data shows the superiority of the products obtained by present invention over related compounds. 
     
         ______________________________________                                    
COMPOUND               K VALUES                                           
______________________________________                                    
Dodecyl [(p-   Present compd.                                             
                           47                                             
dimethylaminobenz                                                         
amido)propyl]                                                             
dimethylammonium                                                          
tosylate                                                                  
Octyldodecyl [(p-                                                         
               Present compd.                                             
                           41                                             
dimethylaminobenz                                                         
amido)propyl]                                                             
dimethylammonium                                                          
tosylate                                                                  
Lauryl 3-      U.S. Pat. No.                                              
                           44                                             
dimethylamino- 4,680,144                                                  
ethyl p-dimethyl-                                                         
aminobenzoyl                                                              
tosylate                                                                  
Stearyl 3-     U.S. Pat. No.                                              
                           37                                             
dimethylamino- 4,680,144                                                  
ethyl p-dimethyl-                                                         
aminobenzoyl                                                              
tosylate                                                                  
Lauryl 3-salicyl-                                                         
               U.S. Pat. No.                                              
                           19                                             
amidopropyl    4,256,664                                                  
dimethyl ammonium                                                         
bromide                                                                   
Lauryl [(p-amino-                                                         
               U.S. Pat. No.                                              
                           22                                             
benzamido)     4,256,664                                                  
propyl]dimethyl-                                                          
ammonium bromide                                                          
______________________________________                                    
 
    
     EXAMPLE 13 
     Hydrolytic Stability 
     The effectiveness of a sunscreening agent is also determined by its hydrolytic stability. We have found that the products developed in this inventive efforts are extremely stable in presence of fatty alcohols (common ingredients in hair conditioners) where as the products described in U.S. Pat. 4,680,144 are not. 10 to 25% product loss due to transesterification with fatty alcohols were observed when heated around 90 to 100° C. for 4 hours under acidic conditions pH 2 to 4). 
     The following is a summation showing the superiority of the present products over those described in related art. 
     
         __________________________________________________________________________
          p-Dimethylamino benzamides                                      
                        p-Dimethylamino benzoates                         
                                      Salicylamides                       
                                               p-Aminobenzamides          
__________________________________________________________________________
U.S. Pat. No.                                                             
          Present Invention                                               
                        4,680,144 and 3,878,229                           
                                      4,256,664                           
                                               4,256,664                  
Molar Extinction.sup.1                                                    
          ˜27,000 ˜27,000 ˜4,900                        
                                               ˜15,300              
Coefficient                                                               
Hair Substantivity                                                        
          6.6.sup.2     4.1           3.9      2.8                        
(mg/G of Hair)                                                            
Hydrolytic Stability                                                      
          Very stable in both basic                                       
                        Not stable in basic                               
                                      Not stable in basic                 
                                               Not stable in acidic       
          and acidic conditions                                           
                        conditions    conditions                          
                                               and basic conditions       
Dispersibility.sup.4                                                      
          Easily dispersible in                                           
                        Less dispersible                                  
                                      Poor dispersibility                 
                                               Poor dispersibility        
          formulation media                                               
Skin compability                                                          
          Substantially Nonirritant.sup.3                                 
                        Slightly irritant                                 
                                      Irritant Irritant                   
Solvent Shift in UV                                                       
          None          None          Large Shift                         
                                               Large Shift                
maxima                                                                    
__________________________________________________________________________
 .sup.1 Higher the value, the better the sunscreen protection ability and 
 the lower the amount of material needed for protection.                  
 .sup.2 Improved substantivity comes from a combination of hydrogen bondin
 capability with hair protein and the products water solubility.          
 .sup.3 Skin compatibility comes from a combination of resemblance of amid
 functionality with the peptide linkage of hair protein (Keratin) and the 
 absence of primary amine or phenolic hydroxyl functionalities.           
 .sup.4 Dispersibility of the product is key in determining how well the  
 product is going to spread on the substrate.                             
 
    
     EXAMPLE 14 
     Formulation of Hair Conditioner with Sun Protection 
     
         ______________________________________                                    
A.      Sunscreen of Example 4                                            
                          2.0%                                            
        Cetyl Alcohol     2.0%                                            
        Ethoxylated Sorbitan Esters                                       
                          4.0%                                            
        Dodecyl Pyrrolidone                                               
                          0.5%                                            
B.      Water             91.5%                                           
______________________________________                                    
 
    
     After adding phase A to B above, the resulting mixture was heated to 80° C., for 1 hour and then cooled to room temperature to produce a creme of relatively low viscosity. Shampooed hair treated with this product had a lustrous and silky appearance. 
     It will be understood that other formulations involving the compounds of this invention provide the benefits described herein and are within the scope of this invention.