Lubricating oil compositions containing graft copolymer as viscosity index improver-dispersant
US4505834A · kind A · utility
42Cited by
10References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 27, 1980 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Oct 27, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2010/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Lubricating oil dispersant VI improvers are made by grafting maleic anhydride to an ethylene/.alpha.-olefin-non-conjugated diene terpolymer in a hydrogen-treated mineral oil solvent using a free radical and then reacting the grafted intermediate with an amine containing only one primary amine group, 1-6 amino nitrogen atoms and 20-36 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.