Lubricant composition containing copolymers of polyisobutylenemethacrylate
AssigneeBASF SE
InventorsSzilard Csihony, Anja Thomas, Kevin J. Desantis, Philippe Rabbat, Andrea Misske, Johannes Barth, Meik Ranft, Peter Mueller, Wolfgang Grabarse, Christoph Fleckenstein
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Abstract
The present invention is directed to the use of poly(polyisobutylenemethacrylate) as viscosity index improving component in lubricating oil compositions. The invention is further related to lubricating oil compositions comprising poly(polyisobutylenemethacrylate) with enhanced shear stability.
Claims17
A lubricating oil composition comprising:
- (a) a base oil,
- (b) a poly(polyisobutylenemethacrylate) copolymer (polyPIBMA) comprising polyisobutylene macromonomers (PIBMA) of formula (I)
- wherein
- R1 to R5 independently from each other are selected from the group consisting of hydrogen, C1-C20-alkyl, C1-C20-alkyloxy and C8-C7500-polyisobutyl C8-C7500-polyisobutenyl,
- R is an alkylene group comprising 2 to 10 carbon atoms,
- R6 is hydrogen or methyl,
- R7 is hydrogen or methyl, or COOR8,
- R8 is hydrogen or C1-C20-alkyl and
- n is a number from 1 to 50,
- characterized in that at least one of R1 to R5 is a C8-C7500-polyisobutyl or C8-C7500-polyisobutenyl,
- and
- (c) additives.
A method for improving the shear stability of a lubricating oil composition, wherein said method comprises the step of adding to a base oil, and an additive, a poly(polyisobutylenemethacrylate) copolymer (polyPIBMA) of formula (I)
- wherein
- R1 to R5 independently from each other are selected from the group consisting of hydrogen, C1-C20-alkyl, C1-C20-alkyloxy and C8-C7500-polyisobutyl and C8-C7500-polyisobutenyl,
- R is an alkylene group comprising 2 to 10 carbon atoms,
- R6 is hydrogen or methyl,
- R7 is hydrogen or methyl, or COOR8,
- R8 is hydrogen or C1-C20-alkyl and
- n is a number from 1 to 50,
- characterized in that at least one of R1 to R5 is a C8-C7500-polyisobutyl or C8-C7500-polyisobutenyl.
Dependencies are inferred from the claim text.