in the component ( a - 1 ), the component ( a - 1 - 1 ) is not particularly restricted providing it is a vinyl - based polymer containing in one molecule at least one radical - polymerizable unsaturated double bond and having a solubility parameter of 10 . 0 or less . preferably , a macromer having a polymerizable double bond in the end can be used . more preferably , a ( meth ) acrylic macromer having a polymerizable double bond in the end can be used . the component ( a - 1 - 1 ) exerts excellent effect by being grafted to the component ( a - 2 ). the method of this graft reaction is not particularly restricted . a macromer is a polymer having a molecular weight from several hundreds to dozens thousands which has a polymerizable reactive group at the end . the term macromer is originally a trade mark registered by ppg , however , it is a common noun now . the end is composed of a polymerizable functional group , and typical example thereof is a vinyl group . by using a macromer , a graft copolymer having clear structure can be obtained easily . descriptions of a macromer are found in “ polymer unabridged dictionary ”, polymer society ed ., published by asakura book store , and the like . a graft reaction is a reaction in which to a back bone polymer is bonded a branch polymer having different chemical structure from that of the back bone , to obtain a graft copolymer . descriptions thereof are found in “ polymer unabridged dictionary ”, polymer society ed ., published by asakura book store , and the like . the amount used of the component ( a - 1 - 1 ) is from 0 . 01 to 10 parts by weight , preferably from 0 . 1 to 5 parts by weight , further preferably from 0 . 5 to 2 parts by weight based on 100 parts by weight of the component ( a - 2 ) described later . when the use amount is less than 0 . 01 , effect for reducing the surface tension is not fully exerted and cissing - resistance and appearance properties deteriorate . further , effect to hydrophobitize a paint film also deteriorates leading to reduction of acid rain - resistance , and the effect thereof can not be fully exerted . when the use amount is over 10 parts by weight , decrease in crosslinking density of the paint film surface causes reductions of physical properties , chemical properties and the like . the solubility parameter is 10 . 0 or less , preferably 9 . 5 to less . further preferably , it is 9 . 0 or less . when the solubility parameter is over 10 . 0 , effect for reducing the surface tension is not fully exerted and cissing - resistance and appearance properties deteriorate . further , effect to hydrophobitize a paint film also deteriorates leading to reduction of acid rain - resistance , and the effect thereof can not be fully exerted . the solubility parameter is from 10 . 0 to 7 . 0 , preferably from 9 . 5 to 7 . 0 . further preferably , it is from 9 . 0 to 7 . 0 . when the solubility parameter is over 10 . 0 , effect for reducing the surface tension is not fully exerted and cissing - resistance and appearance properties deteriorate . further , effect to hydrophobitize a paint film also deteriorates leading to reduction of acid rain - resistance , and the effect thereof can not be fully exerted . the ( meth ) acrylic macromer having a polymerizable double bond at the end has usually a solubility parameter in the range from 7 . 0 to 14 . 0 . in the present invention , the solubility parameter is determined by the fedors method . this method is described in “ polymer engineering and science , vol . 14 , february , pp . 147 to 154 , 1974 ”. the number - average molecular weight is from 1000 to 20000 , further preferably from 3000 to 10000 . when the molecular weight is 1000 or less , physical properties , chemical properties and the like decrease , and also when 20000 or more , appearance properties deteriorate , and the effect thereof can not be fully exerted . in the present invention , the number - average molecular weight can be evaluated by gel permeation chromatography ( gpc ) using polystyrene as a standard . the number of the radical - polymerizable unsaturated double bond is one or more , and excellent effect thereof can be exerted by grafting with the component ( a - 2 ). since problems such as gelation and the like occur when the number is too large , it is desirable to select suitable number at suitable moment . the component ( a - 1 - 1 ) is not particularly restricted providing it contains in one molecule at least one radical - polymerizable unsaturated double bond and has a solubility parameter of 10 . 0 or less . typical examples thereof include an acrylic macromer , ab - 6 , aw - 6s ( manufactured by toagosei co ., ltd .) and the like . in the component ( a - 1 ), the component ( a - 1 - 2 ) is not particularly restricted providing it is a vinyl - based polymer containing in one molecule at least one non - radical - polymerizable functional group having reactivity with the component ( a - 2 ) and having a solubility parameter of 10 . 0 or less . the component ( a - 1 - 2 ) exerts excellent effect thereof by being grafted with the component ( a - 2 ). the grafting method is not particularly restricted . the amount used of the component ( a - 1 - 2 ) is from 0 . 01 to 10 parts by weight , preferably from 0 . 1 to 5 parts by weight , further preferably from 0 . 5 to 2 parts . when the use amount is less than 0 . 01 , effect for reducing the surface tension is not fully exerted and cissing - resistance and appearance properties deteriorate . further , effect to hydrophobitize a paint film also deteriorates leading to reduction of acid rain - resistance , and the effect thereof can not be fully exerted . when the use amount is over 10 parts by weight , decrease in crosslinking density of the paint film surface causes reductions of physical properties , chemical properties and the like . the number - average molecular weight is from 1000 to 20000 , further preferably from 3000 to 10000 . when the molecular weight is 1000 or less , physical properties , chemical properties and the like decrease , and the effect thereof can not be fully exerted . when it is over 20000 , appearance properties deteriorate . the number of the non - radical - polymerizable functional group is one or more , and excellent effect thereof can be exerted by grafting with the component ( a - 2 ). since problems such as gelation and the like occur when the number is too large , it is desirable to select suitable number at suitable moment . the component ( a - 1 - 2 ) is not particularly restricted providing it contains in one molecule at least one non - radical - polymerizable functional group having reactivity with the component ( a - 2 ) and has a solubility parameter of 10 . 0 or less , and a ( meth ) acrylic polymer can be preferably used . examples of the monomer constituting the component ( a - 1 - 2 ) include acrylate or methacrylate monomers carrying an alkyl group or a cyclohexyl group having 1 to 14 carbon atoms ; acrylic acid derivatives or methacrylic acid derivatives containing an acrylate or methacrylate of e . g . methyl -, ethyl -, n - propyl -, isoproppyl -, n - butyl -, isobutyl -, n - amyl -, isoamyl -, n - hexyl -, cyclohexyl -, 2 - ethylhexyl -, octyl -, 2 - ethyloctyl -, decyl -, dodecyl -, cyclohexyl - and the like ; ethylenically unsaturated monomers like aromatic vinyls such as styrene , α - methylstyrene , vinyltoluene and the like , esters of a dicarboxylic acid such as maleic acid , itaconic acid and the like , halogenated ethylenically unsaturated monomers such as vinyl chloride , vinylidene chloride , vinyl fluoride , monochlorotrifluoroethylene , tetrafluoroethylene , chloroprene and the like , nitriles such as acrylonitrile , methacrylonitrile and the like , vinyl esters such as vinyl acetate , vinyl propionate and the like , α - olefins such as ethylene , propylene , isoprene , butadiene , α - olefins having 4 to 20 carbon atoms , and the like , alkyl vinyl ethers such as lauryl vinyl ether and the like ; nitrogen - containing vinyls such as vinylpyrrolidone , 4 - vinylpyrrolidone and the like , amides such as vinylamide , acrylamide , methacrylamide and the like , hydroxyl group - containing vinyl monomers such as hydroxyethyl methacrylate , 2 - hydroxypropyl methacrylate and the like , glycidyl group - containing vinyl monomers such as glycidyl methacrylate , glycidyl acrylate , β - methylglycidyl methacrylate , β - methylglycidyl acrylate , acryl glycidyl ether and the like , carboxyl group - containing vinyl monomers such as acrylic acid , methacrylic acid and the like , amino group - containing vinyl monomers such as dimethylaminoethyl methacrylate , diethylaminoethyl mathacrylate and the like , and these may be used in admixture or combination . the term “ derivative ” used in the present invention includes those obtained by substitution of a hydrogen atom in a specific compound by other atom or atom group r . wherein , r represents a monovalent hydrocarbon group containing at least one carbon atom . more specifically , may be an aliphatic group , an alicyclic group having substantially low aromatic degree , a group including combination thereof , or a divalent residual group obtained by bonding them via nitrogen , sulfur , silicon , phosphorus and the like , and among them , those having aliphatic structures in narrow definition are preferable . r may also be a group obtained by substitution with , e . g ., an alkyl group , cycloalkyl group , allyl group , alkoxyl group , cycloalkoxyl group , allyloxy group , halogen group ( f , cl , br or the like ) and the like on the above - described groups . by suitably selecting these substituents , various properties of a paint film formed from a powder paint composition of the present invention can be controlled . in the vinyl - based polymer ( a - 2 ), the monomer constituting the component ( a - 2 - 1 ) is not particularly restricted providing it is a monomer containing in one molecule at least one radical - polymerizable unsaturated double bond and having no reactive functional group other than the radical - polymerizable unsaturated double bond . specific examples of the vinyl monomer constituting the component ( a - 2 - 1 ) include acrylate or methacrylate monomers carrying an alkyl group or a cyclohexyl group having 1 to 14 carbon atoms ; acrylic acid derivatives or methacrylic acid derivatives containing an acrylate or methacrylate of e . g . methyl -, ethyl -, n - propyl -, isoproppyl -, n - butyl -, isobutyl -, n - amyl -, isoamyl -, n - hexyl -, cyclohexyl -, 2 - ethylhexyl -, octyl -, 2 - ethyloctyl -, decyl -, dodecyl -, cyclohexyl - and the like ; as well as other monomers , and these may be used in admixture or combination . other specific examples of the vinyl monomer constituting the component ( a - 2 - 1 ) include aromatic vinyls such as styrene , α - methylstyrene , vinyltoluene and the like , esters of a dicarboxylic acid such as maleic acid , itaconic acid and the like , halogenated ethylenically unsaturated monomers such as vinyl chloride , vinylidene chloride , vinyl fluoride , monochlorotrifluoroethylene , tetrafluoroethylene , chloroprene and the like , nitrites such as acrylonitrile , methacrylonitrile and the like , vinyl esters such as vinyl acetate , vinyl propionate and the like , α - olefins such as ethylene , propylene , isoprene , butadiene , α - olefins having 4 to 20 carbon atoms and the like , alkyl vinyl ethers such as lauryl vinyl ether and the like , nitrogen - containing vinyls such as vinylpyrrolidone , 4 - vinylpyrrolidone and the like , as well as other monomers , and these may be used in admixture or combination . it is believed that the component ( a - 2 - l ) contributes to improvement of the weather - resistance , adhesion to a substrate and hardness of the resultant paint film . further , generally in the component ( a - 2 - 1 ), also when aromatic vinyls such as styrene and the like or conjugated dienes such as butadiene and the like are used in large amount ( for example , 40 wt % or more based on the total amount of ( a - 2 )), there may be a tendency that the weather - resistance of the resultant paint film decreases , therefore , such use in large amount is not preferable . in the component ( a - 2 - 1 ), when nitrites such as acrylonitrile and the like are used in large amount , there may be a tendency that coloring of a paint film increases , leading to undesirable appearance . in the vinyl - based polymer ( a - 2 ), the monomer constituting the component ( a - 2 - 2 ) is not particularly restricted providing it is at least one monomer containing in one molecule at least one radical - polymerizable unsaturated double bond and at least one non - radical - polymerizable reactive functional group together . the “ non - radical - polymerizable reactive functional group ” is not particularly restricted , and examples thereof include a glycidyl group , epoxy group , hydroxyl group , amino group and the like , and a glycidyl group is preferable . specific examples of the ethylenically unsaturated monomer containing in the molecule at least one glycidyl group and at least one unsaturated double bond include glycidyl methacrylate , glycidyl acrylate , β - methylglycidyl methacrylate , β - methylglycidyl acrylate , acryl glycidyl ether and the like , and these may be used alone or in combination of two or more . the amount used of the component ( a - 2 - 2 ) is from 20 to 60 wt %, preferably from 30 to 55 wt %, more preferably from 40 to 50 wt % based on the total amount of the component ( a - 2 - 1 ) and the component ( a - 2 - 2 ). when the use amount is less than 20 wt %, scratch - resistance , acid rain - resistance and the like deteriorate . on the other hand , when over 60 %, sufficient melting time can not be obtained causing deterioration of appearance properties . the glass transition temperature of the component ( a - 2 ) is from 30 to 120 ° c ., preferably from 40 to 110 ° c ., further preferably from 50 to 100 ° c . in view of the storage stability of a powder paint composition , paint film smoothness ascribed to reduction in the flowability of the paint composition in baking the powder paint , and the like . when the glass transition temperature is less than 30 ° c ., the storage stability deteriorates . on the other hand , when over 120 ° c ., preferable melt viscosity is not obtained leasing to decrease deterioration of appearance properties . the glass transition temperature of a polymer having specific monomer composition can be calculated according to the fox formula . the fox formula is used for calculating the glass transition temperature of a copolymer based on glass transition temperatures of homopolymers of respective monomers forming the copolymer , and details thereof are described in bulletin of the american physical society , series 2 , vol . 1 , no . 3 , p . 123 -, ( 1956 ). regarding the glass transition temperatures of ethylenically unsaturated monomers which are bases for evaluating the glass transition temperature of a copolymer according to the fox formula , there can be adopted , for example , numerical values described in novel polymer library ( shin kobunshi bunko ), vol . 7 , guide of synthetic resin for paint ( toryoyou goseijushi nyumon )( kyozo kitaoka ed ., published by polymer publishing institute ( kobunshi kanko kai ), kyoto , 1974 ), pp . 168 to 169 , table 10 - 2 ( main raw material monomers of acrylic resins for a paint ). the solubility parameter of the component ( a - 2 ) should be higher than that of the component ( a - 1 ). when the solubility parameter of the component ( a - 2 ) is lower than that of the component ( a - 1 ), the effect of the component ( a - 1 ) is disturbed leading to reduction in appearance properties , physical properties and chemical properties . the solubility parameter of the component ( a - 2 ) is usually 14 . 0 or less . the number - average molecular weight of the component ( a - 2 ) is in the range preferably from about 1000 to about 20000 , further preferably from about 2000 to about 10000 . when the number - average molecular weight is less than about 1000 , storage stabilities , physical properties , chemical properties and the like decrease , and when over 20000 , preferable melt viscosity is not obtained leading to deterioration of appearance properties . for controlling the molecular weight of the vinyl - based copolymer ( a - 2 ), there can be used means such as polymerization in the presence of mercaptans such as dodecylmercaptan and the like , disulfides such as dibenzoylsulfide and the like , alkyl esters having 1 to 18 carbon atoms of thioglycolic acid such as 2 - ethylhexyl thioglycolate and the like , chain transfer agents composed of halogenated hydrocarbons such as urea tetrabromide and the like , and organic solvents having chain transfer effect such as isopropyl alcohol , isopropylbenzene , toluene and the like , as well as other means . the method for synthesizing the component ( a - 2 ) is not particularly restricted provided that those having substantially desired properties are obtained , and a solution polymerization method is suitably used . the method for grafting the component ( a - 1 - 1 ) is not particularly restricted , and specifically , there can be adopted the following method regarding an acrylic and / or methacrylic copolymer . { circle around ( 1 )} a solution prepared by dissolving the component ( a - 1 - 1 ) in a solution comprising an acrylic and / or methacrylic monomer and a polymerization initiator is dropped into an organic solvent solution at given temperature , for conducting a graft reaction . { circle around ( 2 )} the component ( a - 1 - 1 ) is previously dissolved in an organic solvent solution , and an acrylic and / or methacrylic monomer and a polymerization initiator are dropped into the solution at given temperature , for conducting a graft reaction . the method for grafting the component ( a - 1 - 2 ) is not particularly restricted , and specifically , there can be adopted the following method other than the above - described methods { circle around ( 1 )} and { circle around ( 2 )} for grafting the component ( a - 1 - 1 ) regarding an acrylic and / or methacrylic copolymer . { circle around ( 3 )} the components ( a - 1 - 2 ) and ( a - 2 ) are uniformly mixed in an organic solvent and the mixture is kept at given temperature , for conducting a graft reaction . the organic solvents used in above - described methods { circle around ( 1 )}, { circle around ( 2 )} and { circle around ( 3 )} are not particularly restricted , and xylene , toluene and the like are preferably used . in the present invention , the hardener component ( b ) comprises a polyvalent carboxylic acid - based hardener . the hardener ( b ) used in the thermosetting powder paint of the present invention is at least one compound selected from the group consisting of polyvalent carboxylic acids and / or polyvalent carboxylic anhydrides . this compound is a hardener component which reacts with an epoxy group ( glycidyl group ) present in the molecule of the resin composition for a powder paint of the present invention . as the polyvalent carboxylic acid - based compound , any of aliphatic , aromatic and alicyclic compounds can be used . as specific examples of aromatic polyvalent carboxylic acid , there are listed , for example , isophthalic acid , trimellitic acid and the like , and these may be used alone or in combination . as specific examples of alicyclic polyvalent carboxylic acid , there are listed , for example , hexahydrophthalic acid , tetrahydrophthalic acid and the like , and these may be used alone or in combination . polyester resins having a carboxyl group , and the like can also be used . in the present invention , use of an aliphatic polyvalent carboxylic acid - based compound is preferable from the standpoints of paint film properties such as smoothness , weather - resistance and the like . the concept of the term “ aliphatic ” used in the specification of the instant application includes not only aliphatic compounds in a narrow meaning but also alicyclic compounds having substantially low aromatic degree . namely , the concept of the term aliphatic compound includes the group consisting of compounds having substantially low aromatic degree and containing in the molecule a divalent hydrocarbon group having at least one carbon atom , and specifically , also includes not only aliphatic compounds in a narrow meaning but also alicyclic compounds having substantially low aromatic degree , groups including combination thereof , or the group consisting of compounds having in the molecule a divalent residual group obtained by bonding them via a hydroxyl group , nitrogen , sulfur , silicon , phosphorus and the like , and more specifically , also includes the group consisting of compounds having in the molecule a group obtained by substitution with , e . g ., an alkyl group , cycloalkyl group , allyl group , alkoxyl group , cycloalkoxyl group , allyloxy group , halogen group ( f , cl , br or the like ) and the like on the above - described groups . by suitably selecting these substituents , various properties ( heat - resistance , toughness , degradability , strength property and the like ) of the copolymer of the present invention can be controlled . the concept of the term aliphatic compound used in the specification of the instant application includes not only one compound but also a combination of two or more . examples of this aliphatic polyvalent carboxylic acid - based compound will be described below . the aliphatic polyvalent carboxylic acid is not particularly restricted providing it is substantially an aliphatic compound containing in the molecule at least two carboxylic groups , and may be used alone or in combination . as the specific example of the aliphatic polyvalent carboxylic acid ( b - 1 ), aliphatic dicarboxylic acids and the like are listed . specific examples of the aliphatic dicarboxylic acid include succinic acid , glutaric acid , adipic acid , pimelic acid , suberic acid , azelaic acid , sebacic acid , citric acid , brassilic acid , undecanedioic acid , dodecanedioic acid , eicosanedioic acid , octadecanedioic acid and the like , and among them , dodecanedioic acid is preferable , and these may be used alone or in combination . regarding paint film properties such as smoothness , impact - resistance , weather - resistance and the like , when the aromatic degree of an alicyclic polyvalent carboxylic acid increases , the paint film properties deteriorate . the polyvalent carboxylic anhydride ( b - 2 ) in the present invention is not particularly restricted providing it is a linear oligo - or poly - aliphatic acid anhydride which is a dimer or higher multimer , containing in the molecule a carboxyl group or no carboxyl group and it is a compound having at least two carboxyl groups and / or acid anhydride groups substantially present in the molecule , and can be used alone or in combination . a certain species of liner polycondensates obtained by dehydration - condensation of one kind of aliphatic polyvalent carboxylic acid , which can be used as the aliphatic polyvalent carboxylic anhydride ( b - 2 ), can be represented by the following general formula ( 1 ): wherein , m represents - a natural number of 1 or more and n represents a natural number of 2 or more , and preferably , m is 30 or less . dehydration - condensates of the aliphatic polyvalent carboxylic acid ( b - 1 ) are listed , and among them , dehydration - condensates of adipic acid , azelaic acid , sebacic acid , eicosanedioic acid , dodecanedioic acid and the like are listed , and a linear dehydration - condensate of dodecanedioic acid is further preferable . typical examples thereof include additol xvl1381 ( manufactured by vianovaledine ) and the like . the aliphatic polyvalent carboxylic anhydride ( b - 2 ) is preferably controlled so that the melting point is in the range from 40 to 150 ° c . the amount of a carboxyl group in the polyvalent carboxylic acid ( b ) is desirably from 0 . 3 to 1 . 2 equivalent , preferably from 0 . 5 to 1 . 1 equivalent , more preferably from 0 . 7 to 1 . 0 equivalent per one equivalent of a glycidyl group in the copolymer ( a - 2 ). then the carboxyl group equivalent is less than 0 . 3 , scratch - resistance , acid - resistance and the like deteriorate , and when over 1 . 2 , appearance properties such as smoothness , sharpness and the like deteriorate . in the method of the present invention , various additives usually added to a paint are added . in the thermosetting powder paint composition of the present invention , appearance or physical properties of a paint film can be improved by appropriately compounding a synthetic resin composition comprising an epoxy resin , polyester resin , polyamide and the like , or a natural resin or semi - synthetic resin composition comprising fibrin , fibrin derivative or the like , according to the intention . in the thermosetting powder paint composition of the present invention , additives such as a hardening catalyst , pigment , flow controlling agent , thixotropy controlling agent , charge controlling agent , surface controlling agent , brightener , blocking preventing agent , plasticizer , ultraviolet ray absorber , boil preventing agent , antioxidant and the like may be appropriately compounded , according to the intention . when used as a clear coat , a small amount of a pigment may also be compounded for coloring to an extent wherein masking property is not exhibited completely . the temperature of a material to be kneaded in mechanically kneading a composition containing ( a ) and ( b ) is not particularly restricted provided that a substantially uniform powder paint composition can be prepared . as the melt kneading apparatus , a heat roll , heat kneader , extruder and the like are usually used . specific examples of the method for compounding the thermosetting powder paint composition of the present invention may include , but are not limited to , methods in which kneading machines and blending machines such as rolls , kneaders , mixers ( banbury type , transfer type and the like ), calender apparatuses , extruders and the like are appropriately combined , conditions for each process ( temperature , melting or non - melting , revolution , vacuum atmosphere , inert gas atmosphere and the like ) are appropriately set , materials are mixed uniformly , then , a uniform powder paint composition in the form of a fine powder is obtained by a grinding apparatus . a massive paint obtained by kneading is cooled before being ground to obtain an average particle size of about 10 to 90 μm . as the grinding apparatus used , a hammer mill and the like are listed . a powder of thermosetting powder paint composition obtained by grinding is allowed to adhere to a painting subject by a painting method such as an electrostatic painting method , flow immersion method and the like , and heated to thermoset to form a paint film . the thermosetting powder paint composition of the present invention can be usually baked at a temperature from about 100 ° c . to about 180 ° c ., preferably from about 120 ° c . to about 160 ° c ., for usually about 10 minutes to about 60 minutes , to conduct the crosslinking reaction of the resin composition ( a ) with the hardener ( b ). after baking , the composition is cooled to room temperature to obtain a paint film having excellent properties . when the thermosetting powder paint composition of the present invention is used as a top coat paint , even if not only a conventional solvent type paint but also an aqueous paint is used as a primer paint thereof , a paint film obtained by baking the paint of the present invention shows excellent properties like the case wherein a solvent type paint is used . namely , an aqueous primer paint ( including pigment - containing paint and / or metal powder - containing paint ) is painted , dried to given time , then , the thermosetting powder paint composition of the present invention is allowed to adhere onto the primer paint by the above - described method , and heated to thermoset to form a paint film . the method for painting the thermosetting powder paint composition of the present invention can also be applied to bodies or parts ( aluminum wheel , wiper , center pillar and the like ) of automobiles . a paint film formed by a suitable or public - known and used painting method using the thermosetting powder paint composition of the present invention has excellent storage stabilities ( blocking - resistance and the like ), appearance properties ( cissing , smoothness , sharpness and the like ), physical properties ( hardness , scratch - resistance and the like ) and chemical properties ( weather - resistance , acid - resistance , solvent - resistance and the like . in the specification of the instant application , production examples , examples and embodiments are used for helping understanding of the content of the invention according to the instant application and descriptions thereof do not limit the scope of the present invention at all . in the descriptions , “ parts ” and “%” are by weight unless otherwise stated . a black paint containing polyester - melamine crosslinking was painted to obtain a thickness of 20 μm on a 0 . 8 mm thick bonderizing steel plate on which zinc phosphating treatment had been performed , then , the paint was baked at 170 ° c . for 30 minutes , to prepared a primer - treated steel plate . ability evaluations were conducted as follows . ( i ) blocking test of powder paint a cylindrical vessel having an internal diameter of 20 mm was charged with 6 . 0 g of a powder paint , and after storage at 30 ° c . for 7 days , the powder was removed , and blocking condition of the powder paint was checked by visual observation and finger touch , and evaluated by ⊚ to ×. appearances of a paint film were observed visually and evaluated by ⊚ to ×. cissing of a paint film was visually observed and evaluated by ◯, ×. its was evaluated by the pencil scratch test ( according to jis k 5400 6 . 14 ). mark was represented by pencil hardness . a scratch test was conducted in which the surface of a paint film was rubbed with a brush using a 3 % abrasive suspension , and gloss ( 20 ° gloss ) was evaluated before and after the rubbing , and gloss retention was calculated . the gloss retention was evaluated by ⊚, ◯ and ×. a 10 vol % sulfuric acid solution was dropped on the surface of a paint film , and left for 1 day at room temperature . then , the sulfuric acid drop was wiped off , and appearance was observed and evaluated by ⊚, ◯ and ×. the surface of a paint film was rubbed back and forth 50 times with a gauze impregnated with xylene , and the paint film was observed and evaluated by ⊚, ◯ and ×. a promotion test was conducted by a quv tester for 2000 hours , and glossiness of a paint film before and after the promotion test was measured , and the gloss remaining rate (%) was obtained . the gloss remaining rate was calculated according to the numerical formula ( vi ). gloss   remaining   rate  [ % ] = 60  °   glossiness   after   promotion   test 60  °   glossiness   before   promotion   test × 100 ( vi ) a four - necked flask equipped with a stirrer , thermometer , reflux condenser and nitrogen inlet tube was charged with 66 . 7 parts of xylene and was heated to the reflux temperature . into monomers shown in table 1 were dissolved 1 . 0 part of n , n ′- azobisisobutyronitrile as a polymerization initiator , and the mixed solutions were dropped over 5 hours , then , the mixtures were kept at 100 ° c . for 5 hours . by removing solvents from the resultant polymerization solutions , vinyl - based copolymers were obtained ( production examples 1 , 2 ). physical properties of the resulted copolymers were described together in table 1 . monomer compositions shown in table 2 were subjected to the same procedure as in the above - described production example of ( a - 1 - 2 ) to obtain vinyl - based copolymers ( comparative production examples 1 , 2 , 3 ). physical properties of the resulted copolymers were described together in table 2 . a four - necked flask equipped with a stirrer , thermometer , reflux condenser and nitrogen inlet tube was charged with 66 . 7 parts of xylene and was heated to the reflux temperature . into monomers and the component ( a - 1 - l )( aw - 6s and ab - 6 ) shown in table 3 were dissolved 3 . 5 part of n , n ′- azobisisobutyronitrile as a polymerization initiator , and the mixed solutions were dropped over 5 hours , then , the mixtures were kept at 100 ° c . for 5 hours . by removing solvents from the resultant polymerization solutions , vinyl - based copolymers were obtained ( production examples 1 , 2 ). physical properties of the resulted copolymers are described together in table 3 . production examples 3 , 4 , 5 , 6 , 7 , 8 of vinyl - based polymer ( a ) a four - necked flask equipped with a stirrer , thermometer , reflux condenser and nitrogen inlet tube was charged with 66 . 7 parts of xylene and was heated to the reflux temperature . into monomers shown in table 3 were dissolved 3 . 5 part of n , n ′- azobisisobutyronitrile as a polymerization initiator , and the mixed solutions were dropped over 5 hours , then , the mixtures were kept at 100 ° c . for 5 hours . by adding the component ( a - 1 - 2 ) shown in table 3 to the resultant polymerization solution and removing solvents from the solutions , vinyl - based copolymers were obtained ( production examples 3 , 4 , 5 , 6 , 7 , 8 ). physical properties of the resulted copolymers are described together in table 3 . a four - necked flask equipped with a stirrer , thermometer , reflux condenser and nitrogen inlet tube was charged with 66 . 7 parts of xylene and was heated to the reflux temperature . into a monomer and the component ( a - 1 - l )( aa - 6 ) shown in table 4 was dissolved 3 . 5 part of n , n ′- azobisisobutyronitrile as a polymerization initiator , and the mixed solution was dropped over 5 hours , then , the mixture was kept at 100 ° c . for 5 hours . by removing a solvent from the polymerization solution , a vinyl - based copolymer was obtained ( comparative production example 1 ). physical properties of the resulted copolymer are described together in table 4 . comparative production examples 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 of vinyl - based polymer ( a ) a four - necked flask equipped with a stirrer , thermometer , reflux condenser and nitrogen inlet tube was charged with 66 . 7 parts of xylene and was heated to the reflux temperature . into a monomer shown in table 4 was dissolved 3 . 5 part of n , n ′- azobisisobutyronitrile as a polymerization initiator , and the mixed solution was dropped over 5 hours , then , the mixture was kept at 100 ° c . for 5 hours . by adding the products of production example 1 of the component ( a - 1 - 2 ) and comparative production examples 1 , 2 , 3 of the component ( a - 1 - 2 ) shown in table 4 to the resultant polymerization solution and removing solvents from the polymerization solutions , vinyl - based copolymers were obtained ( comparative production examples 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ). physical properties of the resulted copolymers are described together in table 4 . acrylic copolymers ( a ) ( production examples 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ) and the component ( b ) were compounded in proportions ( parts ) shown in table 5 , each 1 part of tinuvin 144 ( manufactured by ciba geigy , light stabilizer ) and benzoin ( boil preventing agent ) and 2 parts of tinuvin 900 ( manufactured by ciba geigy , ultraviolet ray absorber ) were added based on 100 parts by weight of the total amount of ( a ) and ( b ), the mixtures were melted and kneaded under the condition of 90 ° c . by a heat roll , and cooled , then , finely ground by a grinder , and fractions passed through a 150 mesh sieve were collected to obtain powder paints . the resulted powder paints were painted on primer - treated steel plates by an electrostatic spray to obtain a thickness of 60 to 70 μm , then , heated at 150 ° c . for 30 minutes to obtain test plates . a test plate was obtained in the same manner as in example 1 except that 72 parts of the acrylic copolymer ( a ) produced in production example 1 , 28 . 0 parts of additol vxl1381 ( manufactured by hechst ), a commercially available aliphatic polyacid anhydride hardener as a polyvalent carboxylic acid - based hardener ( b ), and 0 . 2 parts of tin octoate ( neostan u - 28 , manufactured by nitto kasei co ., ltd .) as a hardening catalyst were used . test plates were obtained in the same manner as in example 1 except that the acrylic copolymers ( comparative production examples 1 to 6 and 8 to 9 of ( a )) and the component ( b ) were compounded in proportions ( parts ) shown in table 6 . test plates were obtained in the same manner as in example 1 except that 79 . 3 parts of the acrylic copolymer produced in comparative production example 7 of ( a ), 20 . 7 parts of dodecanedioic acid , and 1 . 0 part of the products of comparative production example 3 of the component ( a - 1 - 2 ) or production example 2 of the component ( a - 1 - 2 ) were used . results of evaluation of the powder paints and paint films formed in examples 1 to 9 are shown in table 7 . further , results of evaluation of the powder paints and paint films formed in comparative examples 1 to 10 correlating to them are shown in table 8 . the powder paint compositions of examples 1 to 8 shown in table 7 satisfy the numerical ranges according to the present invention , and these results show that the present invention provides a thermosetting powder paint composition which can give a paint film having excellent storage stabilites ( blocking property and the like ), appearance properties ( cissing , smoothness , sharpness and the like ), physical properties ( hardness , scratch - resistance and the like ) and chemical properties ( weather - resistance , acid - resistance , solvent - resistance and the like ). in comparative examples 1 , 2 , 3 , the solubility parameter of the component ( a - 1 ) was over 10 , and cissing - resistance , acid - resistance and the like were poor . in comparative examples 4 , 5 , the use amount of the component ( a - 1 ) was out of the range defined in claims , and when this amount was less than the range defined in claims , appearances , cissing - resistance and acid - resistance were poor . on the other hand , when this amount was over than the range defined in claims , acid - resistance and the like were poor . in comparative examples 6 , 7 , 8 , the component ( a - 1 ) was not grafted to the component ( a - 2 ), and blocking property , cissing - resistance and the like were poor . in comparative examples 9 , 10 , the use amount of the component ( a - 2 - 2 ) was out of the range defined in claims , and in this case , when this amount was less than the range defined in claims , scratch - resistance and solvent - resistance were poor . on the other hand , when this amount was over than the range defined in claims , appearance was poor . the evaluation results of examples 1 to 9 are shown in table 7 . the evaluation results of comparative examples 1 to 10 are shown in table 8 .