Cold flow improver compositions for fuels

C - Chemistry – Metallurgy – 10 – M

Patent

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C10M 157/10 (2006.01) C10L 1/14 (2006.01) C10L 1/196 (2006.01) C10L 1/197 (2006.01) C10L 10/04 (2006.01) C10M 143/00 (2006.01) C10M 145/10 (2006.01) C10M 145/14 (2006.01) C10L 1/16 (2006.01) C10L 1/18 (2006.01) C10L 1/22 (2006.01)

Patent

CA 2490424

A fuel oil composition having improved low temperature properties comprising a fuel oil and a polymeric substance selected from the group consisting of: (a) (i) copolymers of one or more monoesters of maleic acid, itaconic acid or citraconic acid with one or more branched monohydric alcohols having 1 to 18 carbon atoms and more than a single methyl branch, or one or more straight-chain monohydric alcohols having less than 10 carbon atoms; and one or more vinyl esters of carboxylic acids having 2 to 18 carbon atoms; or (ii) copolymers of a C4 to C6 dicarboxylic acid anhydride and one or more vinyl esters of carboxylic acids having 2 to 18 carbon atoms, esterified with one or more monohydric alcohols having 1 to 18 carbon atoms; (b) copolymers of one or more alkylacrylates or alkylmethacrylates, where the alkyl groups have 1 to 18 carbon atoms, and acrylic or methacrylic acid; (c) copolymers of one or more acrylic acids or methacrylic acids and one or more vinyl esters of carboxylic acids having 2 to 18 carbon atoms; and, (d) (i) homopolymers of one or more monoesters of an unsaturated C4 to C6 dicarboxylic acid with a branched monohydric alcohol having 1 to 18 carbon atoms and more than a single methyl branch, or a straight-chain monohydric alcohol having less than 10 carbon atoms, or (ii) homopolymers of an C4 to C6 dicarboxylic acid anhydride, followed by esterification with one or more monohydric alcohols having 1 to 18 carbon atoms, the polymeric substance being present in the fuel oil in combination with two or more cold flow additives selected from the group consisting of: ethylene- unsaturated monomer copolymers; comb polymers; polar nitrogen compounds; polyoxyalkylene compounds and di-block hydrocarbon polymers.

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