FIELD: chemistry.
SUBSTANCE: invention relates to a copolymer, a method for production thereof, use thereof, as well as to an oil fuel containing such a copolymer. Method of producing copolymer involves polymerising at least one maleic acid or derivatives thereof (A), at least one α-olefin, having at least 6 to inclusive 20 carbon atoms (B), at least one of C3- up to C20-alkyl ether of acrylic acid or methacrylic acid or a mixture of such alkyl esters (C) and optionally one or more additional copolymerisable monomers (D). Monomers (D) differ from monomers (A), (B) and (C). Polymerisation is carried out in solution at temperature from 50 to 250 °C in continuous mode. Further, reacting with at least one dialkylamine (E), wherein two alkyl radicals of at least one dialkylamine (E) are independently alkyl radicals having at least 17 to 30 carbon atoms. Dialkylamine used is di-n-octadecylamine, di-n-nonadecylamine or di-n-eicosylamine. Molar ratio of dialkylamine (E) and maleic acid or its derivative (A) in the copolymer is at least 1.2:1 and up to 2.0:1. Copolymer is used to reduce crystallisation of paraffin crystals in fuels, to improve flow properties at low temperature of oil fuels and to improve filtrability of oil fuels containing additives for improving fluidity at low temperatures. Oil fuel contains from 10 to 5,000 wt. parts per million of at least one said copolymer and optionally an additive. Additives are selected from a group comprising low-flow additives at low temperature, paraffin dispersants, additives for conductivity, additives for corrosion protection, lubricating additives, antioxidants, metal deactivators, antifoaming agents, demulsifiers, detergents, cetane number increasing additives, solvents, diluents, dyes and flavoring agents.
EFFECT: invention reduces crystallisation of paraffin crystals in fuel, improves flow properties at low temperature of oil fuels, and improves filterability of oil fuels.
11 cl, 6 tbl, 16 ex
