Olefin polymer viscosity index improver additive useful in oil compositions
US4749505A · kind A · utility
43Cited by
44References
44Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1985 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Jul 8, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2810/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Olefin polymers are degraded in molecular weight in the presence of a free radical initiator under an inert blanket. The degradation preferably is carried out under high shearing stress and/or a high temperature in order to increase the degradation. The degradation may be separate from, overlap, or occur simultaneously with further derivatization of the polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.