unless indicated otherwise , the amounts and the percentages indicated in the examples below are values by mass . 5 lubricant compositions were prepared by mixing at room temperature a hydrocarbon mineral oil ( distillation range : 250 - 335 ° c . ( iso 3405 ); kinematic viscosity @ 40 ° c . : 3 . 7 ( en iso 3104 ); aromatic level : & lt ; 100 ppm ( hplc ); flash point : 115 ° c . ( en iso 2719 )) marketed by total fluides under the name of edc - 11 with one of the 5 additives below in the proportions indicated in table 1 . add 1 : pc 32 : mixture of fatty acids and of resin acids from tofa ( tall oil fatty acid ) marketed by total additifs & amp ; carburants spéciaux ( containing less than 10 % of resin acids ) add 2 : mixtures of tofa glycerol esters ( comprising in majority monoesters ) a hfrr ( high frequency reciprocating rig ) test is conducted in order to evaluate the lubricity of the compositions by resuming the operating conditions of the iso 12156 standard except for the duration of the test which is set to 120 minutes of friction and the temperature of the test which is room temperature ( 25 ° c .). the results are grouped in table 1 . it is noticed that the additives add 2 ( according to the invention ), add 3 and add 4 ( comparative additives ) have a rather similar behavior : with rapid decrease in the diameter of the imprint when the treatment rate increases , so as to obtain a plateau of the order of 200 μm . the preferred additive add 1 ( according to the invention ) is differentiated from the 4 other ones , since its efficiency is much greater for a low treatment level ( of the order of 100 ppm ). as for example 1 , lubricant compositions are prepared , one containing the additive add1 at 1 % ( according to the invention ), or the additive add 5 at 1 % or 3 % ( comparatives ) and a hydrocarbon mineral oil ( distillation range : 220 - 240 ° c . ( iso 3405 ); kinematic viscosity @ 40 ° c . : 1 . 9 ( en iso 3104 ); aromatic level : 100 ppm ( hplc ); flash point : 92 ° c . ( en iso 2719 ) marketed by total fluides under the name of edc - pearl , a drilling mud is prepared from this composition . a tribometer with a ring - plane configuration is immersed in the drilling mud , in which tribometer a planar specimen ( 18 * 30 * 7 mm ) performing an alternating linear movement at low speed and a cylindrical specimen ( radius 35 mm ) performing a rotary movement ( 0 . 6 m / s ), are put into contact , both specimens are in cement steel of the 42 cd4 type and have a mechanical strength comprised between 900 and 1 , 100 mpa . the muds are tested at 20 ° c ., 50 ° c . and then 100 ° c . they remain in the tribometer during a same series of measurements at these 3 temperatures . during the test , the friction coefficient is recorded versus time , over a period of 250 s . 3 repeatability tests are carried out each time . * at 20 ° c . : 5 minutes of grinding at 514 mpa ; 5 minutes of coefficient measurement at 152 mpa ; * 7 minutes for attaining 50 ° c . at 54 mpa ; 5 minutes of coefficient measurement at 512 mpa ; * 10 minutes for attaining 100 ° c . at 54 mpa ; 5 minutes of coefficient measurement at 512 mpa . the results are grouped in table 2 . it is noticed that with add1 it is possible to significantly reduce the friction coefficient of the muds than with add 5 . aerobic biodegradability tests were only conducted on add 1 to 3 and on the hydrocarbon oil edc 95 - 11 following the oecd 306 protocol for 7 days and 28 days . the biodegradability results are gathered in table 3 . it is noticed that the results are excellent for add1 and add2 : the measured biodegradability percentages are considerably larger than certain regulatory requirements of 20 %, which is not the case of add 3 after 7 days . the flash point ( nf en iso 2719 ), the pour point ( astm d 7346 ) and kinematic viscosity @ 40 ° c . ( nf en iso 3104 ) of lubricant compositions containing 500 ppm , 1 % or 3 % of additive addi are measured and compared with those of the corresponding non - additived hydrocarbon oil . the results are grouped in table 4 . repeatabilities of the measurements : for the flash point , the repeatability r is 8 - 10 ° c . ( r = 0 . 071 × the value found during the measurement ); for the pour point : the repeatability is 6 ° c . regardless of the measured value ; for the viscosity r = 0 . 082 ×( value of the measurement + 1 ). it is seen that by incorporating an additive it is possible to slightly increase the value of the flash point of the oil ; the pour point is lowered in the presence of add 1 and this from the treatment level of 500 ppm . for lubricant compositions additived with 1 % of add 1 and add 2 of table 4 , the changes in the kinematic viscosity are evaluated depending on the temperature ( nf en iso 3104 ), as well as for a composition additived with 1 % add3 . the results are grouped in table 5 as well as those of the non - additived corresponding oil . it is seen that the presence of a lubrication additive , in an amount of 1 % by mass of the fluid , does not have any impact on the change in viscosity . lubricant compositions are prepared with 1 % of the add 1 to add 3 and a hydrocarbon mineral oil ( distillation range : 230 - 270 ° c . ( iso 3405 ); kinematic viscosity @ 40 ° c . : 2 . 3 ( en iso 3104 ); aromatic content & lt ; 10 ppm ( hplc ); flash point : 100 ° c . ( en iso 2719 ) marketed by total fluides under the name of edc - 99 w . the results are grouped in table 6 as well as those of the non - additived corresponding oil . it is seen that that at high temperatures , the viscosity is not influenced by the presence of a lubrication additive while at lower temperatures , the difference in viscosity between the virgin oil and the additived oil may attain 8 %. in order to evaluate the stability over time of the lubricant compositions containing 1 % of add 1 and either the oil edc 95 - 11 or the oil edc 99 dww , each lubricant composition is placed in a 50 ml frusto - conical vial which is left closed at room temperature for several weeks in the laboratory exposed to light . it is checked that the lubricant composition remains stable , homogeneous and does not demix . the observations are grouped in table 7 . the lubricant compositions are tested for friction on a bench dedicated to oil drilling applications , the fan lubricity tester , so as to appreciate the quality of the different systems in terms of lubricity . drilling muds are formulated from the lubricant compositions and are then tested on a fann lubricity tester . the results are grouped in table 8 below . it is noticed that the additive add 3 is not as efficient as add 1 and add 2 .