Poly(meth)acrylate-based viscosity index improver, lubricant additive and lubricant composition containing viscosity index improver

  • US 9,783,757 B2
  • Filed: 07/24/2013
  • Issued: 10/10/2017
  • Est. Priority Date: 07/24/2012
  • Status: Active Grant
First Claim
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1. A lubricating oil composition comprising:

  • a lubricating base oil; and

    a poly(meth)acrylate-based viscosity index improver comprising;

    a core portion derived from a compound having three or more functional groups that react with a carbon-carbon double bond of an acryloyl group chosen from the group consisting of 1,1,1-tris(2-bromoisobutyloxymethylene)ethane, pentaerythritoltetrakis(2-bromoisobutyrate), and dipentaerythritolhexakis(2-bromoisobutyrate); and

    three or more arm portions,wherein each of the arm portions consists of a polymer chain consisting of structural units represented by formula (1) shown below, and one end of the polymer chain is bonded to the core portion,

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