Viscosity index improver and lube oil containing the same
US6746993B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2002 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Aug 7, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Viscosity index improvers, are disclosed, comprising the following polymer (A1) or (A0).Polymer (A1) has a solubility parameter of 8.6-9.4, a crystallizing initiation temperature of −15° C. or less and a steric hindrance factor (F) of 0-13, and comprises units of at least one of (a) C1-40alkyl group-containing (meth)acrylates, (b) alkyl alkenyl ethers, (c) alkenyl carboxylates and (d) nitrogen-containing unsaturated monomers.Polymer (A0) comprises units of a branched C20-40alkyl group-containing (meth)acrylate (a0) capable of providing a homopolymer having a Tc of 5° C. or less and units of another alkyl (meth)acrylate.Monomers, 2-decyl-tetradecyl methacrylate and 2-decyl-tetradecyl acrylate, are also described, suitable for producing polymers for viscosity index improvers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.