FIELD: lubrication materials. SUBSTANCE: additives are prepared by reaction of alkylsalicylic acids having 16-18 carbon atoms in alkyl chains with calcium hydroxide (12-32% of the weight of reaction mixture) and carbon dioxide (4- 14%) in presence of mineral oil at 40 to 90 C using 5 to 24% water as reaction promoter. EFFECT: reduced power consumption and simplified process. 1 tbl
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