Copolymers comprising alpha olefins and olefinindicarboxylic acid esters, their preparation and use as pour point depressants for crude oils, mineral oils or mineral oil products

摘要

Copolymer (X) comprising as monomer (A) at least 40 to 60% molar, based on the amount of all monomers, of at least one α-olefin (A) of the general formula H2C = CH-R1, in which R1 represents at least one linear, cyclic or branched, aliphatic and / or aromatic hydrocarbon radical with 14 to 50 carbon atoms, as well as (B) 60 to 40 mol%, based on the amount of all monomers , dicarboxylic acids with an ethylenic unsaturation or derivatives thereof, characterized in that the monomers (B) are (B1) at least one monomer (R2OOC) R5C = CR6 (COOR4), (B2) at least one monomer (R3OOC) R5C = CR6 (COOR4) as well as (B3) optionally at least one monomer chosen from the group of (HOOC) R5C = CR6 (COOH) (B3a) and ** (See formula) ** where - R2 represents a radical linear alkyl with 16 to 36 carbon atoms, - R3 represents a radical chosen from the group of R3a: linear 1-alkyl radicals with 1 to 10 carbon atoms, R3b: alkyl radicals branched and / or secondary with 4 to 36 carbon atoms, R3c: cyclic alkyl radicals with 5 to 18 carbon atoms unsubstituted or substituted with alkyl, or R3d: hydrocarbon radicals with 6 to 36 aromatic unsubstituted or substituted with carbon atoms alkyl, - R4 represents in each case a radical chosen from the group of H, R2 and R3, provided that in each case at least 50 mol% of the radicals R4 is H, - R5 and R6 represent in each case H or methyl, - the fraction of the radicals R3 with respect to the sum of the radicals R2 and R3 is from 1 mol% to 49 mol%, - the fraction of the monomers (B1) + (B2), with respect to to the sum of all the monomers (B), it is at least 50 mol%, and - the weight average molecular weight Mw of the copolymers (X) is from 2,000 g / mol to 25,000 g / mol.