Star polymers of dienes, vinylarenes and alkyl methacrylates as modiied viscosity index improvers
US5344887A · kind A · utility
4Cited by
20References
7Claims
0Family size
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Key dates
| Filing date | Dec 21, 1992 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Dec 21, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Star polymers having first polymeric arms comprising a hydrogenated conjugated diene and smaller second polymeric arms of a methacrylate resist coupling of methacrylate blocks attached to different cores and have improved performance as viscosity index improvers. The polymerized methacrylate units are converted to amide or imide groups by reaction with a primary or secondary amine to give the viscosity index improver dispersant properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.