Patent ID: 6767374
Filing Date: 2004-07-27
Classification: C10L

Abstract:
A method of improving the cold flow characteristics of a fuel oil, the method comprising adding to the fuel oil as a wax crystal modifier an additive composition comprising:(i) an oil soluble hydrogenated block butadiene polymer, the polymer comprising at least one crystallizable block, obtainable by end-to-end polymerization of a linear butadiene and at least one non-crystallizable block, the non-crystallizable block being obtainable by 1,2-configuration polymerization of a linear butadiene, and (ii) a fuel oil cold flow improver other than the hydrogenated block butadiene polymer as defined in (i), and said cold flow improver is a fuel oil cold flow improver selected from: (A) ethylene-unsaturated ester compounds, (B) comb polymers, (C) polar nitrogen compounds, (D) compounds comprising a ring system having at least two substituents comprising a linear or branched aliphatic hydrocarbylene group optionally interrupted by one or more hetero atoms and carrying a secondary amino group, the substituents on the amino groups each being a hydrocarbyl group containing 9 to 40 carbons, (E) polyoxyalkylene compounds, and (F) hydrocarbon polymers.