Ethylene copolymer viscosity index improver dispersant additive

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

1987-06-16

1989-02-07

Dixon, Jr., William R.

Compositions

Electrolytes for electrical devices

252 56R, C10M10522

Patent

active

048030031

ABSTRACT:
Oil-soluble, derivatized ethylene copolymers derived from about 15 to 90 wt. % ethylene, and one or more C.sub.3 to C.sub.28 alpha-olefins, e.g. propylene, which are grafted, preferably solution-grafted under an inert atmosphere and at elevated temperatures and in the presence of a high-temperature decomposable free-radical initiator, with an ethylenically-unsaturated dicarboxylic acid material and thereafter reacted with a polyamine having at least two primary amine groups, and a carboxylic acid to form carboxyl-grafted polymeric imide, usually maleimide, derivatives are subsequently reacted with a C.sub.12 to C.sub.18 hydrocarbyl substituted dicarboxylic acid anhydride, preferably a C.sub.12 to C.sub.18 hydrocarbyl substituted succinic anhydride, to yield an oil-soluble stable imide of said carboxyl-grafted copolymeric imide whereby oil solutions thereof are characterized by minimal viscosity change over an extended period of time.

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patent: 4637886 (1987-01-01), Brois
patent: 4670173 (1987-06-01), Hayashi et al.
patent: 4686054 (1987-08-01), Wisotsky et al.

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