METHOD OF PREPARING ADDITIVE FOR LUBRICATING OIL Russian patent published in 1995 - IPC

FIELD: organic chemistry. SUBSTANCE: method involves interaction of α-b-unsaturated carboxylic acid and its active derivative with beam-like polymer being selectively hydrogenated. Said polymer has polyvinyl aromatic nucleus and at least 4 polymer beams on the base of diene (co)polymers, molecular weight of each beam being 5000-150000. Thus prepared product is then reacted with compound having common formula RO(AO)_nH where h=C₉-C₁₁, A=C₂H₂, C₃H₆ n is 3-7, molar ratio of said compound and hydroxyl groups in said polymer being (1:2):(2:1). The process is carried out at 150-170 C. EFFECT: improves efficiency of the method. 3 cl, 2 tbl