(Meth)acrylate polymers for improving the viscosity index

摘要

The invention relates to a (meth)acrylate polymer for improving the viscosity index, which comprises a) from 5 to 60 wt % of repeating units that are derived from (meth)acrylates of formula (I), where R represents hydrogen or methyl and R1 is an alkyl radical having from 1 to 6 carbon atoms, b) from 5 to 80 wt % of repeating units that are derived from (meth)acrylates of formula (II), where R is hydrogen or methyl and R2 is an alkyl radical having from 7 to 30 carbon atoms, and c) from 15 to 90 wt % of repeating units that are derived from (meth)acrylates of formula (III), where R is hydrogen or methyl, n is an integer in the range of 2 to 500 and A is C2-C4 alkylene and R3 is a hydrogen atom or an alkyl radical having from 1 to 4 carbon atoms. The invention further relates to novel lubricating oil compositions, to a method for producing the above-mentioned (meth)acrylate polymers and to the use thereof for improving the viscosity index of lubricating oil compositions that comprise at least one polar base oil.

主权项

1. A (meth)acrylate polymer, comprising:
a) 5% to 60% by weight of a repeating unit derived from at least one (meth)acrylate of formula (I):wherein R represents hydrogen or methyl, and R1 represents an alkyl radical having 1 to 6 carbon atoms;
b) 5% to 65% by weight of a repeating unit derived from at least one (meth)acrylate of formula (II):wherein R represents hydrogen or methyl, and R2 represents an alkyl radical having 7 to 30 carbon atoms; and
c) 60% to 90% by weight of a repeating unit derived from at least one (meth)acrylate of formula (III):wherein R represents hydrogen or methyl, n represents a number in the range from 2 to 500, A represents C2-C4 alkylene, and R3 represents a hydrogen atom or an alkyl radical having 1 to 4 carbon atoms.