Patent ID: 6391071
Filing Date: 2002-05-21
Classification: C10L

Abstract:
A method for improving the lubricity of a low-sulfur middle distillate oil having a sulfur content less than 0.5 wt-% sulfur, said process comprising combining the low-sulfur middle distillate oil with less than 0.5 weight percent of an oil-soluble copolymer comprising:A) from 5 to 80 mol-% of structural units derived from olefinically unsaturated compounds containing at least one free hydroxyl group, B) from 5 to 95 mol-% of structural units derived from olefinically unsaturated compounds carrying a hydrocarbon radical having at least 6 carbon atoms, and, if desired, C) from 0 to 40 mol-% of further structural units selected from the group consisting of acrylic acid, acrylates, vinyl esters, vinylethane and alkenes, with the proviso that the structural units mentioned under C) are different from the structural units mentioned under A) and B), and have a mean molecular weight Mw of from 500 to 100,000 g/mol and an OH number of from 10 to 300 mg of KOH/g.