Copolymers comprising ethylene, vinyl esters and esters of (meth) acrylic acid, their formulations and use as a pour point depressant, wax inhibitor and flow enhancer for crude oils

摘要

Copolymer (A) comprising at least ethylene, a vinyl ester and a (meth) acrylate, in which the copolymer (A) comprises at least (M1) 83.5 mol% to 96.5 mol% ethylene, (M2) 3 mol% to 11.5 mol% of at least one vinyl ester of the general formula H2C = CH-O- (O) C-R1 (I) in which R1 is H or an alkyl moiety C1 to C4, and (M3) 0.5 mol% to 5 mol% of a (meth) acrylate of the general formula H2C = C (R2) -COOR3 in which R2 is H or methyl, and R3 is selected from the group of R3a: branched alkyl moieties having 4 to 18 carbon atoms, R3b: cyclic alkyl moieties having 5 to 12 carbon atoms, and R3c: aryl moieties optionally substituted with alkyl having 6 to 12 carbon atoms, and wherein the weight average molecular weight Mw of the copolymer (A) is 35,000 g / mol to 150,000 g / mol.