ACRYLATE POLYMER FOR INCREASING VISCOSITY INDEX Russian patent published in 2015 - IPC C08F220/18 C08F220/28 C10M145/10 

FIELD: chemistry.

SUBSTANCE: invention relates to (meth)acrylate polymers used to increase viscosity index and to lubricating oil compositions containing said polymers. Disclosed (meth)acrylate polymer for increasing viscosity index, which contains: a) 5-60 wt % repeating links of (meth)acrylate derivatives of formula (I) wherein R is hydrogen or methyl and R¹ is methyl, b) 15-70 wt % repeating links of (meth)acrylate derivatives of formula (II) wherein R is hydrogen or methyl, R² is an alkyl residue with 7-30 carbon atoms, and c) 25-70 wt % repeating links of (meth)acrylate derivatives of formula (III) wherein R is hydrogen or methyl, n is a number from 2 to 500, A is an alkylene with 2-4 carbon atoms and R³ is a hydrogen atom or an alkyl residue with 1-4 carbon atoms. The invention also discloses a novel lubricating oil composition, a method of producing the disclosed (meth)acrylate polymers and versions of use thereof.

EFFECT: disclosed polymer provides extremely high efficiency in optimising viscosity indices of lubricating oils without adversely affecting the environmental safety of the base oil.

14 cl, 5 tbl, 11 ex