COPOLYMER AND USE THEREOF TO IMPROVE FLOW PROPERTIES AT LOW TEMPERATURES OF MIDDLE-DISTILLATE FUELS Russian patent published in 2016 - IPC C08F222/12 C08F220/12 C08F220/16 C08F220/68 C10L1/196 

FIELD: chemistry.

SUBSTANCE: invention relates to copolymer, which is used to improve flow properties of middle-distillate fuels at low temperatures. Copolymer consists of (i) from 10 to 90 mol% repeating units with structure W1: where variables values of R¹ and R² denote hydrogen, alkyl with 1-4 carbon atoms or carboxylic ester groups of formula -COOR⁹, wherein R⁹ denotes hydrocarbon residue with 6-30 carbon atoms, and one of variables values R¹ or R² represents hydrogen or alkyl with 1-4 carbon atoms and other is carboxyl ester group of formula -COOR⁹ and variable values of R³ and R⁴ represent hydrogen, alkyl with 1-4 carbon atoms, carboxyl an ester group of formula -COOR⁹, where R⁹ denotes hydrocarbon residue with 6-30 carbon atoms, or carboxyl group, which can be in form of salts thereof with alkali and alkali-earth metals or in form of ammonium salts. At that, one of variables values R³ or R⁴ is hydrogen or alkyl with 1-4 carbon atoms, and other is carboxyl ester group of formula -COOR⁹ and/or carboxyl group, which can also be in form of its salts with alkaline metal, alkali-earth metal or in form of ammonium salt, and (ii) from 90 to 10 mol% repeating units structure W2: in which variable value R⁵ is residue of carboxylic ester of formula -A-CO-O-R¹⁰, in which variable value A is an alkylene group with 1-20 carbon atoms, and variable value R¹⁰ is hydrocarbon residue with 1-30 carbon atoms and variable values of R⁶, R⁷ and R⁸, independently represent hydrogen or alkyl with 1-8 carbon atoms. At that, sum of repeating units W1 and W2 is equal to 100 mol%. Also disclosed is method of producing copolymer, middle-distillate fuel containing copolymer, use of copolymer.

EFFECT: copolymer is used to improve flow properties at low temperatures middle-distillate fuels, particularly consisting of biogenic fuel oils or compositions containing them.

11 cl, 1 tbl, 6 ex