Stabilized imide graft of ethylene copolymeric additives for lub

Details Stabilized imide graft of ethylene copolymeric additives for lub Stabilized imide graft of ethylene copolymeric additives for lub

1977-07-28

1979-01-30

Vaughn, Irving

Compositions

Electrolytes for electrical devices

252 515A, 252402, 252403, C10M 140, C10M 334, C10M 132, C10M 326

Patent

active

041371852

ABSTRACT:
Oil-soluble, derivatized ethylene copolymers derived from about 2 to 98 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, e.g. an alkylene polyamine such as diethylene triamine, to form carboxyl-grafted polymeric imide, usually maleimide, derivatives are reacted with an anhydride of a C.sub.1 -C.sub.30 hydrocarbyl substituted acid, preferably acetic anhydride, to yield an oil-soluble stable amide of said polyamine whereby oil solutions of said amide derivative are characterized by minimal viscosity change over an extended period of time. Useful number average molecular weight (M.sub.n) of said copolymers range from about 700 to 500,000; however, if the molecular weight is from 10,000 to 500,000 then these copolymers are also useful as multifunctional viscosity index improvers.

REFERENCES:
patent: 3216936 (1965-11-01), Le Suer
patent: 3326804 (1967-06-01), Roselle
patent: 3415750 (1968-12-01), Anzenberger
patent: 4051050 (1977-09-01), Elliott et al.

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