Patent ID: 8288327
Filing Date: 2012-10-16
Classification: C08F,C10M,C10N

Abstract:
1. A lubricant composition having good frictional properties, comprising: a base oil and at least one additive having friction-modifying properties, wherein the additive having friction-modifying properties is a block copolymer comprising: hydrophobic segments P and polar segments D, wherein the hydrophobic segments are obtained by polymerization of monomer compositions which comprises a) from 0.5 to 40% by weight, based on the weight of the monomer compositions for preparing the hydrophobic segments, of one or more ethylenically unsaturated ester compounds of the formula (I): wherein R is hydrogen or methyl, R R b) from 50 to 99.5% by weight, based on the weight of the monomer compositions for preparing the hydrophobic segments, of one or more ethylenically unsaturated ester compounds of the formula (II): wherein R is hydrogen or methyl, R R c) from 0 to 50% by weight, based on the weight of the monomer compositions for preparing the hydrophobic segments, of comonomers, and the polar segments are represented by the formula (III): wherein R is independently hydrogen or methyl, R X is independently a sulfur or oxygen atom or a group of the formula NR R n is an integer greater than or equal to 3, and further wherein a ratio of the length of the hydrophobic segments to the polar segments of the block copolymer is in the range of from 5:1 to 1:2.