POLYMERIC COMPOSITIONS COMPOSED OF ETHYLENE-VINYL ESTER COPOLYMERS ALKYL (METH)ACRYLATES, PROCESSES FOR PRODUCTION THEREOF AND USE THEREOF AS POUR POINT DEPRESSANTS FOR CRUDE OILS, MINERAL OILS OR MINERAL OIL PRODUCTS

摘要

Polymeric compositions obtainable by free-radical polymerization of at least two different alkyl (meth)acrylates in the presence of at least one ethylene-vinyl ester copolymer, the alkyl (meth)acrylates used being a mixture comprising alkyl (meth)acrylates having linear C12- to C60-alkyl radicals and different alkyl (meth)acrylates having linear C1- to C11-alkyl radicals and/or branched C4- to C60-alkyl radicals and/or cyclic C5- to C20-alkyl radicals. The use of such polymeric compositions as pour point depressants for crude oils, mineral oils or mineral oil products.

主权项

1. A polymeric composition obtainable by free-radical polymerization of monoethylenically unsaturated monomers (A) in the presence of at least one ethylene-vinyl ester copolymer (B),
the monomers (A) comprising at least 70% by weight of alkyl (meth)acrylates (A1) based on the amount of all monomers (A), the ethylene-vinyl ester copolymers (B) comprising 55 to 85% by weight of ethylene and 15 to 45% by weight of vinyl esters of the general formula H2C═CH—O—(O)C—R1 (III) where R1 is H or a C1- to C4 hydrocarbyl radical, and the amount of the monomers (A) being 70 to 90% by weight and that of the ethylene-vinyl ester copolymers (B) 10 to 30% by weight based on the sum of the monomers (A) and the ethylene-vinyl ester copolymers (B) together, wherein the alkyl (meth)acrylates (A1) are a mixture of (A1a) 50 to 99 mol % of at least one alkyl (meth)acrylate (A1a) of the general formula H2C═C(R2)—COOR3 where R2 is H or a methyl group and R3 is a linear alkyl radical having 12 to 60 carbon atoms, and (A1b) 1 to 49 mol % of at least one alkyl (meth)acrylate (A1b) of the general formula H2C═C(R2)—COOR4 where R2 is as already defined and R4 is a hydrocarbyl radical selected from the group of R4a, R4b and R4c radicals and the radicals are each defined as follows:
R4a: linear alkyl radicals having 1 to 11 carbon atoms,R4b: branched alkyl radicals having 4 to 60 carbon atoms, andR4c: cyclic alkyl radicals having 5 to 20 carbon atoms,with the proviso that the sum of the amounts of (A1a) and (A1b) adds up to 100 mol %.