Asymmetric triblock copolymer viscosity index improver for oil compositions
US5458792A · kind A · utility
6Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1994 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Aug 11, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L53/025
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention includes asymmetric triblock copolymers which are used as viscosity index improvers in oil compositions formulated for high performance engines. The triblock copolymers have the block structure hydrogenated polyisoprene-polystyrene-hydrogenated polyisoprene wherein the ratio of the number average molecular weights of the first and second hydrogenated polyisoprene blocks is at least 4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.