| abstract |
According to the present invention, there is provided a process for producing a copolymer by copolymerizing a 1-alkene having 5 to 80 carbon atoms with maleic anhydride to obtain a copolymer, an esterification reaction of the copolymer and an alcohol having 5 to 25 carbon atoms in the presence of trifluoromethanesulfonic acid , And a step of obtaining a reaction mixture containing an esterified product containing at least one repeating unit selected from the formulas (c) to (f), wherein the formulas (c) to f), R represents an aliphatic hydrocarbon group having 3 to 78 carbon atoms, R 2 represents a hydrocarbon group having 5 to 25 carbon atoms, m represents a copolymerization molar ratio X (X) of the 1-alkene (X) / Y, 1/2 to 10/1, and n is an integer of 1 or more. |