MULTIPURPOSE MOTOR OIL COMPOSITION, LUBRICATING COMPOSITION, AND LUBRICATING COMPOSITION ADDITIVE SET Russian patent published in 2000 - IPC

FIELD: lubricants. SUBSTANCE: composition contains 1.5 to 55 wt.% of additive set, which consists of components A and B and, in some cases, component C. Component A contains: (i) 10 to 100% of multifunctional ashless surfactant and dispersant additive or its oil solution, containing polymer ingredients based on substituted derivatives of polyolefins with number-average molecular weight at least 800, preferably polyisobutylene, prepared by grafting one or several carboxylic acids and/or their anhydrides and one or several nonacid ethylenically-unsaturated comonomers followed by reaction of grafted product with compounds bearing amino and/or imino, and/or hydroxy groups so that, in additive, there is 1.6 to 20 acid derivative motifs per one polyolefin chain, while number of molecules with more than one acid derivative moieties is at least 25%, said acid derivatives being imides and/or amides and/or ester-amides; and (ii) 0 to 90% of alkenylsuccinic acid derivatives of the above-indicated type. Component B contains one or several additives such as metal-containing surfactants and dispersants characterized by different saponification numbers and containing different percentages of metal, antioxidants, antifriction agents, corrosion inhibitors, foam suppressors, and freezing point depressant. Component C can contain one or several conventional thickeners. A/B/C weight ratio should be (15-85):)(15-85): (0-70). EFFECT: extended application area. 18 cl, 2 dwg, 11 tbl, 4 ex