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US 7,067,599 B2Granted
Fuel oil additives and compositions
AssigneeInfineum International Limited
InventorsRobert Dryden Tack, Brid Dilworth, Dennis George Peiffer
Life of this patent
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Abstract
A copolymer comprising units derivable from (A) one or more olefins of defined chain length; and (B) one or more ethylenically unsaturated compounds different from (A). The copolymers are useful as cold flow improvers in fuel oils.
Claims9
A middle distillate fuel oil composition comprising fuel oil boiling in the range of from 100° C. to 500° C. and a copolymer comprising:
- (A) either:
- (i) an olefin;
- or
- (ii) a mixture of olefins;
- and
- (B) an ethylenically unsaturated compound selected from the group consisting of acrylic acid, methylacrylic acid, fumaric acid, maleic acid and maleic anhydride;
- wherein the olefin or mixture of olefins carry hydrocarbyl substituents containing a continuous chain of carbon atoms, and optionally oxygen and/or nitrogen and/or sulfur atoms;
- the average length of the chains being at least 22 atoms;
- and wherein the copolymer is derivatized with an amine selected from the group consisting of n-octyl amine, n-hexyl amine, n-butyl amine and n-propyl amine, said derivatization being carried out after preparation of the copolymer.
6 more elements
Dependencies are inferred from the claim text.