Viscosity index improver with high thickening power
US4412087A · kind A · utility
32Cited by
20References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1981 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Dec 16, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M2205/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Hydrogenated random block conjugated diene/monovinylarene copolymers with a terminal monovinylarene block having a diene content in the range of 44 to 70 weight percent, normalized vinyl in the range 30.2-51.3 percent, percent vinyl based on copolymer plus percent styrene in the range 59.8-71.5 percent, and molecular weight M.sub.n in the range 94,000-199,000, used as viscosity index improver in lubricating oil, exhibits unusually high thickening power, yet provides viscosity index, pour point, and shear loss at very desirable levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.