FIELD: chemistry.
SUBSTANCE: invention pertains to perfection of the method of obtaining alkylsalicylic acids. The method involves reaction of salicylic acid with an olefin, containing at least four carbon atoms, at high temperature in the presence of alkylsulfonic acid as a catalyst. The invention also pertains to a composition for obtaining additives to lubrication oils, containing alkylsalicylic acid obtained using the above mentioned method. The obtained product has low content of alkylphenols and good colour. Its acid number is 60-95% of the theoretical value. The values of the results of PDSC testing (pressure differential scanning calorimetry) and "panel coker" test are comparable with or surpass the corresponding values for the control salicylic detergents produced in the industries.
EFFECT: obtaining a product of alkylation of salicylic acid with low content of alkylphenols and good colour.
20 cl, 12 ex
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