Patent ID: 8642521

Claim:
A method for improving a cold flow property of a fuel oil, the method comprising: adding a cold flow improver additive to a fuel oil in need thereof, wherein the cold flow improver additive comprises a polymer that comprises, in copolymerized form, monomers M1, M2, and M3 of formulae: wherein R 1 is H or C 1 -C 40 -hydrocarbyl; R 2 , R 3 , and R 4 are each independently H or C 1 -C 4 -alkyl; R 5 is C 4 -C 10 -hydrocarbyl; R 6 , R 7 , and R 8 are each independently H or C 1 -C 4 -alkyl; R 9 is C 1 -C 20 -hydrocarbyl; a molar proportion of M1 in the polymer is from 0.60 to 0.98; a molar proportion of M2 in the polymer is from 0.01 to 0.20; a molar proportion of M3 in the polymer is from 0.01 to 0.20; M2 and M3 are in the polymer in random distribution; and a viscosity of the polymer is from 10 to 1000 m 2 /s at a temperature of 120° C. as determined according to DIN 51562.