COPOLYMER AND USE THEREOF TO REDUCE CRYSTALLISATION OF PARAFFIN CRYSTALS IN FUELS Russian patent published in 2021 - IPC C08F222/04 C08F222/06 C08F8/32 C10L1/14 C10L1/16 C08F220/00 

FIELD: oil and gas industry.

SUBSTANCE: present invention relates to oil fuel. Oil fuel contains from 10 to 5,000 parts per million of at least one copolymer. Said copolymer is obtained by copolymerisation of: (A) at least one unsaturated dicarboxylic acid or derivative thereof; (B) of at least one α-olefin, having at least 6 to 20 carbon atoms, inclusive; and (C) optionally, at least one complex, having from 3 to 20 carbon atoms in alkyl, alkyl ester of acrylic acid or methacrylic acid or a mixture of such alkyl esters; followed by reaction with at least one dialkylamine (E), where alkyl residues of at least one dialkylamine (E) independently from each other are alkyl residues, having at least 17 to 30 carbon atoms. Molar ratio (A):(B):(C) is 1: 0.5 to 2.0: 0 to less than 0.5. Additionally, it may contain other additives selected from a group, consisting of cold flow improvers, paraffin dispersants, conductivity improvers, anticorrosive additives, lubricating additives, antioxidants, metal deactivators, antifoaming agents, demulsifiers, detergents, cetane number improvers, solvents or diluents, dyes and odorants.

EFFECT: technical result is the creation of a copolymer which reduces the undesirable tendency of middle distillate propellants to precipitate paraffin.

11 cl, 4 tbl, 7 ex