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 Russian patent published in 2018 - IPC C10L10/16 C10L1/196 C10L1/236 F17D1/17 C08F255/02 C08F263/02 C08L51/06 

FIELD: chemistry.

SUBSTANCE: invention relates to polymer compositions which are obtained by radical polymerisation. Polymer composition having pour point depressant properties is obtained by radical polymerisation of monoethylenically unsaturated monomers (A) in the presence of at least one copolymer of ethylene with a vinyl ester (B), wherein: monomers (A) comprise at least 70 wt% alkyl(meth)acrylates (A1), based on the amount of all monomers (A), copolymers of ethylene with a vinyl ester (B) contain from 55 to 85 wt% monomer units of ethylene and from 15 to 45 wt% monomer units of the vinyl ester of general formula H₂C=CH-O-(O)C-R¹ (III), in which R¹ is a hydrocarbon residue having 1 to 4 carbon atoms and the amount of monomers (A) is from 70 to 90 wt%, and the amount of copolymers of ethylene with vinyl ester (B) is from 10 to 30 wt%, respectively, based on the total amount of monomers (A) and copolymers of ethylene with vinyl ester (B). Process is characterised in that alkyl(meth)acrylates (A1) are a mixture of: (A1a) – 50 to 99 mol% of at least one alkyl(meth)acrylate (A1a) of general formula H₂C=C(R²)-COOR³, in which R² is hydrogen or a methyl group and R³ is an unbranched alkyl radical having from 16 to 30 carbon atoms, and (A1b) represents from 1 to 50 mol% of at least one alkyl(meth)acrylate (A1b) of general formula H₂C=C(R²)-COOR⁴, in which R² is as indicated above, and R⁴ is a hydrocarbon residue selected from the group consisting of the radicals R^4a, R^4b and R^4c, respectively, denoting: R^4a unbranched alkyl radicals having 1 to 11 carbon atoms, R^4b branched alkyl residues with 4–60 carbon atoms and R^4c cyclic alkyl residues with 5–20 carbon atoms, provided that the total amount of alkyl(meth)acrylates (A1a) and (A1b) is 100 mol%. Use of polymer compositions as pour point depressant additives for crude oils, petroleum fuels or petroleum products is disclosed.

EFFECT: resulting polymer composition reduces pour point of crude oils, petroleum fuels or petroleum products.

21 cl, 2 tbl