Ethylene copolymer viscosity index improver-dispersant additive useful in oil compositions
US4557847A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1983 |
| Grant date | Dec 10, 1985 |
| Priority date | — |
| Expiry date | Nov 21, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M2217/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Oil soluble viscosity index improving ethylene copolymers, such as copolymers of ethylene and propylene; and ethylene, propylene and diolefin; etc., are reacted or grafted with ethylenically unsaturated carboxylic acid moieties, preferably maleic anhydride moieties, and reacted with polyamines having two or more primary amine groups and a branched carboxylic acid component, preferably alkylene polyamine and branched monocarboxylic acid having 2 to 6 aliphatic hydrocarbon branches of 8 to 24 carbons each. Or the grafted ethylene copolymer can be reacted with already formed salts, and amides, etc. of said polyamine and branched acid component. These reactions can permit the incorporation of varnish inhibition and dispersancy into the ethylene copolymer while inhibiting cross-linking with resulting viscosity increase, haze or gelling. The aforesaid grafting reaction may be carried out thermally, or more preferably with a free radical initiator such as a peroxide in a mineral lubricating oil, in which case the branched acid component, preferably also acts to solubilize insoluble compounds formed by side reactions, such as maleic anhydride grafted oil molecules reacted with amine, to th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.