| 摘要 |
<p>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 wit h one or more monohydric alcohols having 1 to 18 carbon atoms; (b) copolymers of one or more alkylacrylates or alkylmethacrylates, where th e 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) homopolymersof 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 tw o 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.</p> |
