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

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 HC=CH-O-(O)C-R(III), in which Ris 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 HC=C(R)-COOR, in which Ris hydrogen or a methyl group and Ris 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 HC=C(R)-COOR, in which Ris as indicated above, and Ris a hydrocarbon residue selected from the group consisting of the radicals R, Rand R, respectively, denoting: Runbranched alkyl radicals having 1 to 11 carbon atoms, Rbranched alkyl residues with 4-60 carbon atoms and Rcyclic 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 Изобретение относится к полимерным составам, которые получают радикальной полимеризацией. Полимерный состав, обладающий свойствами понижающей температуру застывания депрессантной присадки, получают радикальной полимеризацией моноэтиленненасыщенных мономеров (А) в присутствии по меньшей мере одного сополимера этилена со сложным виниловым эфиром (В), причем: мономеры (А) содержат по меньшей мере 70% масс. алкил(мет)акрилатов (А1) в пересчете на количество всех мономеров (А), сополимеры этилена со сложным ви