Back to results
US 5,328,960 AGranted
Oil soluble ionic graft copolymers
AssigneeMobil Oil Corporation
InventorFrederick C. Loveless
Life of this patent
Estimating the term…
Abstract
A lubricant additive which is the reaction product of polyvinylpyridine and sulfonated polyisobutylene is oil soluble and provides clear solutions in oil. These reaction products are ionic graft copolymers. The reaction products of the invention form solutions with lubricant base stocks, such as mineral oil, and are excellent Viscosity Index enhancers. Moreover, the reaction products of the invention act as thickening agents for the oil or grease of the lubricant composition of the invention, at very low levels of reaction product content.
Claims9
An oil soluble ionic graft copolymer comprising
- 5 to 35 weight percent polyvinylpyridine consisting essentially of vinylpyridine and
- 65 to 95 weight percent a sulfonated polyisobutylene or salts thereof,
- wherein the sulfonated polyisobutylene is sulfonated only once at most on each molecule and wherein the copolymer is characterized by a molar ratio of nitrogen, provided by said polyvinylpyridine, to sulfur, provided by said sulfonated polyisobutylene or salts thereof, which ranges from 20:1 to 1:1 wherein the sulfonated polyisobutylene contains 0.85 to 1.0 double bonds per molecule, and each molecule is sulfonated once at most.
Dependencies are inferred from the claim text.