Viscosity index improver for lubricants based on polyisobutylenephenyl acrylate comb copolymers
AssigneeBASF SE
InventorsIvette Garcia Castro, Rene Koschabek, Andrea Misske, Christoph Fleckenstein
Life of this patent
Estimating the term…
Abstract
The present invention relates to a comb copolymer comprising in polymerized form a PIB macromonomer of the formula (I) and an acrylate monomer of the formula (II). The invention further relates to a method of preparing the PIB macromonomer of the formula (I) where a polyisobutene phenol of the formula (III) is reacted with (meth)acrylic acid anhydride; and to a lubricant comprising a base oil, the comb copolymer, and further lubricant additives; and to a use of the comb copolymer for improving the viscosity index of a lubricating oil.
Claims15
A comb copolymer comprising in polymerized form
- (A) a PIB macromonomer of the formula (I)
- where
- R1 to R5 are selected independently from each other from the group comprising hydrogen, C1-C20-alkyl, C1-C20-alkyloxy, C8-C7500-polyisobutyl and C8-C7500-polyisobutenyl, where at least one of R1 to R5 is a C8-C7500-polyisobutyl or C8-C7500-polyiso-butenyl group, and
- R6 is hydrogen or methyl, and
- (B) an acrylate monomer of the formula (II)
- where
- R7 is hydrogen or methyl, and R8 is a C1-36 alkyl.
A method of preparing the PIB macromonomer of the formula (I)
- where
- R1 to R5 are selected—independently from each other—from the group comprising hydrogen, C1-C20-alkyl, C1-C20-alkyloxy und C8-C7500-polyisobutyl und C8-C7500-polyisobutenyl, where at least one of R1 to R5 is a C8-C7500-polyisobutyl or C8-C7500-polyiso-butenyl group, and
- R6 is hydrogen or methyl,
- where
- a polyisobutene phenol of the formula (III)
- is reacted with (meth)acrylic acid anhydride.
Dependencies are inferred from the claim text.