Patent ID: 8937035
Filing Date: 2015-01-20
Classification: C10M,C10N

Abstract:
1. A lubricating composition comprising an oil of lubricating viscosity and a star polymer, wherein the star polymer comprises a core bonded to at least two inner blocks, at least one of which in turn is bonded to one or more outer blocks, wherein at least one inner block consists essentially of: wherein the (meth)acrylate alkyl group of the inner block has a number average number of carbons of 5.6-7.7; and wherein at least one outer block consists essentially of: wherein the (meth)acrylate alkyl group of the outer block has a number average number of carbons of 8.2 to 11.9; and wherein the difference in the number average number of carbon atoms between the alkyl groups of the inner block and the alkyl groups of the outer block is between 2 and 5; wherein the number average number of carbon atoms in the alkyl groups of the inner block is less than the average number of carbon atoms in the alkyl groups of the outer block, and wherein the star the ratio of the inner block to the outer block is 20:80 to 80:20 by weight.