Block copolymers of dienes, vinylarenes, and alkylmethacrylates as modified viscosity index improvers
US5272211A · kind A · utility
9Cited by
16References
10Claims
0Family size
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Key dates
| Filing date | Dec 21, 1992 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Dec 21, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/94
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Polymers comprising blocks of a hydrogenated conjugated diene (B), a vinylarene (A), and an alkyl methacrylate (M), are readily prepared as a mixture of molecules having the structures B-A-M and B-A-M-A-B wherein both structures are effective as viscosity index improvers for oil compositions. Reaction of the polymers with a primary or secondary amine results in a dispersant viscosity index improver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.