Viscosity additive for lubricating oils, process for its preparation and lubricating compositions based on the said additive
US5108635A · kind A · utility
13Cited by
13References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1990 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Jan 26, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition of matter, particularly useful as a viscosity additive comprising: PA0 6 to 15 parts by weight of a 60/40-54/46 ethylene/propylene copolymer of Mw 155,000-250,000 (OCP), PA0 2 to 8 parts by weight of a poly(C.sub.1 -C.sub.20 alkyl methacrylate) of Mw 30,000-150,000 (PMA) with a PMA/OCP ratio of 1/5 to 1/1, and PA0 the complement to 100 parts by weight of diluent oil. Also disclosed are lubricating compositions comprising the above additive composition, preferably in an amount of from 0.1 to 10% by weight based on the weight of lubricating oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.