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US 2013/0281340 A1Published application
Lubricant Compositions Comprising Ethylene Propylene Copolymers and Methods for Making Them
AssigneeExxonMobil Chemical Patents Inc.
InventorRainer Kolb
Life of this patent
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Abstract
Lubricant compositions, as well as processes for their formulation, are provided. The lubricant compositions comprise an oil basestock and one or more blocky ethylene propylene copolymers. The copolymers are preferably prepared using metallocene catalyst systems but without using a chain shuttling agent.
Claims25
A lubricant composition comprising:
- a. an oil basestock;
- and
- b. from about 0.5 to about 2.5 wt. %, based on the total weight of the lubricant composition, of a copolymer of propylene and ethylene, wherein the copolymer comprises from about 50 to about 95 wt. % ethylene, the copolymer has a melting point greater than about 90° C., and less than about 5 wt. % of the copolymer, based upon the total weight of the copolymer, is soluble in xylene or ortho-dichlorobenzene.
A lubricant composition comprising:
- a. an oil basestock;
- and
- b. from about 7.5 to about 15.0 wt. %, based on the total weight of the lubricant composition, of a copolymer of propylene and ethylene, wherein the copolymer comprises from about 50 to about 95 wt. % ethylene, the copolymer has a melting point greater than about 90° C., and less than about 5 wt. % of the copolymer, based upon the total weight of the copolymer, is soluble in xylene or ortho-dichlorobenzene.
A process for making a lubricant composition comprising:
- combining (a) an oil basestock, and (b) from about 0.5 to about 2.5 wt. %, based on the total weight of the lubricant composition, of a copolymer of propylene and ethylene, wherein the copolymer comprises from about 50 to about 95 wt. % ethylene, the copolymer has a melting point greater than about 90° C., and less than about 5 wt. % of the copolymer, based upon the total weight of the copolymer, is soluble in xylene or ortho-dichlorobenzene.
Dependencies are inferred from the claim text.