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US 10,968,413 B2Granted
Vinyl-based comb polymer
AssigneeKaneka Corporation
InventorYoshihiro Ikari
Life of this patent
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Abstract
A vinyl-based comb copolymer includes a polyisobutylene-based macromonomer unit and a vinyl-based monomer unit. A polyisobutylene-based macromonomer has at least 0.8 (meth)acryloyl groups represented by a specific formula at one end of a main chain per molecule, and is copolymerized with a vinyl-based monomer. A method for producing the vinyl-based comb copolymer includes copolymerizing the polyisobutylene-based macromonomer with the vinyl-based monomer. A viscosity index improver includes the comb copolymer. A lubricating oil composition includes the comb copolymer.
Claims11
A vinyl-based comb copolymer that is a polymer of:
- a polyisobutylene-based macromonomer;
- and
- a vinyl-based monomer,
- wherein the polyisobutylene-based macromonomer comprises at least 0.8 (meth)acryloyl groups represented by general formula (1) at one end of a main chain per molecule,
- wherein R1 is hydrogen or a methyl group, R2 is a divalent saturated hydrocarbon group having 2 to 6 carbon atoms and having no hetero atoms, and R3 and R4 each are hydrogen, a monovalent hydrocarbon group having 1 to 20 carbon atoms, or an alkoxy group.
2 more elements
Dependencies are inferred from the claim text.