Viscosity index improver--dispersant additive useful in oil compositions
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United States of America Patent
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Oct 25, 1988
Issued Date -
N/A
app pub date -
Jun 18, 1987
filing date -
Jul 6, 1984
priority date (Note) -
Expired
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Abstract
Hydrocarbon polymers such as ethylene copolymers may be reacted with unsaturated nitrogen-containing monomers or unsaturated carboxylic acids in the presence of a free radical catalyst such as a peroxide or azo free radical initiator and a chain stopping agent, e.g. a mercaptan to inhibit excessive cross-linking and branching. The copolymer grafted directly with the nitrogen-containing monomers may be utilized as an additive for oil and fuel compositions, particularly lubricating oil compositions as a V.I.-dispersant additive. The polymer reacted with carboxylic acid may be further reacted with amines, polyols, amino-alcohols, etc. to also form a V.I.-dispersant additive.
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