Clear high-performance multifunction VI improvers
AssigneeTexaco Inc.
InventorsMaria M. Kapuscinski, Larry D. Grina, Lee A. Brugger
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Abstract
This invention is a method of producing a clear, high-performance dispersant/antioxidant VII. The method comprising admixing a polar modifier to a VI improver during preparation process or to final product at a sufficiently high temperature to produce the desired clear, high performance VI improver.
Claims19
A method for making a clear, high-performing dispersant/antioxidant viscosity index improver comprising:
- (a) mixing about 1-40 parts of a dispersant monomer and about 0.2 to about 10 parts of a free-radical initiator with about 100 parts of a heated polymer solution and performing a grafting reaction of monomer onto polymer, said reaction being carried out at a temperature of about 50.degree. C. to about 200.degree. C. for a period of about 5 to about 120 minutes;
- (b) adding about 1-40 parts of an antioxidant monomer, about 0.2 to about 10 parts of a free radical initiator and about 0.5 to about 10 parts of a polar modifier to said reaction mixture to perform grafting reaction to produce a clear, high-performance dispersant/antioxidant viscosity index improver and recovering;
- and
- (c) recovering the dispersant/antioxidant viscosity index improver product.
A method of producing a clear, high performance dispersant/antioxidant viscosity index improver comprising:
- (a) reaction 100 parts of a polymer base, 1-40 parts of a dispersant monomer, 1-40 parts of an anti-oxidant monomer in the presence of about 0.2 to about 10 parts of a free radical initiator and about 0.5 to about 10 parts of a prior modifier to provide a clear, high performance dispersant/antioxidant viscosity index improver, said reaction being carried out at a temperature of about 50.degree. C. to about 200.degree. C. for a period of about 5 to about 120 minutes;
- and
- (b) recovering the viscosity index improver product.
A method of making a clear, high-performance dispersant/anti-oxidant viscosity index improver comprising:
- (a) heating a dispersant/anti-oxidant viscosity index improver with about 0.5 to about 10 parts of a polar modifier to produce a clear high-performance dispersant/anti-oxidant viscosity index improver product said reaction being carried out at a temperature of about 50.degree. C. to about 200.degree. C. for a period of about 5 to about 20 minutes;
- and
- (b) recovering said viscosity index improver product.
A method of producing a clear, high-performance dispersant/antioxidant viscosity index improver comprising admixing a polar modifier to a viscosity index improver which is based on a oil-soluble, substantially linear carbon-carbon backbone polymer grafted with a dispersant monomer and an antioxidant monomer containing at least one of sulfur, nitrogen or oxygen in a heterocyclic ring.
Dependencies are inferred from the claim text.