Ethylene copolymer viscosity index improver dispersant additive useful in oil compositions
A composition useful as an oil additive is described comprising reaction product of: (i) reaction product of (a) oil soluble ethylene copolymer comprising from about 15 to 90 wt. % ethylene and about 10 to 85 wt. % of at least one C/sub 3/ to C/sub 28/ alpha-olefin, the copolymer having a number average molecular weight within a range of about 10,000 to 500,000, grafted with ethylenically unsaturated carboxylic acid material having 1 to 2 carboxylic acid groups or anhydride group, (b) at least one polyamine selected from the group consisting of poly(alkylene amines) and poly(oxyalkylene amines) having at least two primary amine groups, and (c) at least one carboxylic acid material selected from long chain hydrocarbyl substituted succinic anhydride or acid having about 50 to 400 carbons in the hydrocarbyl; and (ii) a viscosity stabilizing effective amount of at least one C/sub 12/ to about C/sub 16/ aliphatic hydrocarbyl substituted succinic anhydride.
- Assignee:
- Exxon Chemical Patents Inc., Linden, NJ
- Patent Number(s):
- US 4803003
- OSTI ID:
- 6058741
- Country of Publication:
- United States
- Language:
- English
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