Viscosity index improvers for lubricating oil compositions
US7163913B2 · kind B2 · utility
7Cited by
16References
14Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 1, 2003 |
| Grant date | Jan 16, 2007 |
| Priority date | — |
| Expiry date | Mar 23, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/25
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A polymer suitable for use as a viscosity index improver for lubricating oil compositions, which is at least one, at least partially hydrogenated linear or star-shaped random copolymer of isoprene and butadiene, in which at least 70 wt. % of the butadiene is incorporated into the polymer as 1,4 units and the weight ratio of isoprene addition product to butadiene addition product in the copolymer is in a range of from about 90:10 to about 70:30.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.