Ethylene copolymer viscosity index improver-dispersant additive

Details Ethylene copolymer viscosity index improver-dispersant additive Ethylene copolymer viscosity index improver-dispersant additive

1983-11-21

1985-12-10

Howard, Jacqueline V.

Compositions

Electrolytes for electrical devices

5253317, 252 56D, 252 56R, C10M 136

Patent

active

045578478

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 thereby inhibit haze formation, particularly when preparing oil concentrates of the V.I.-dispersant additive for later addition to lubricating oils.

REFERENCES:
patent: 3316177 (1967-04-01), Dorer, Jr.
patent: 3326804 (1967-06-01), Hu
patent: 4089794 (1978-05-01), Engel et al.
patent: 4137185 (1979-01-01), Gardiner et al.
patent: 4144181 (1979-03-01), Elliott et al.
patent: 4160739 (1979-07-01), Stambaugh et al.
patent: 4161452 (1979-07-01), Stambaugh et al.

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