AGENT FOR IMPROVING FLUIDITY OF FUEL OIL AND FUEL OIL COMPOSITION

摘要

Provided is an agent for improving the fluidity of a fuel oil with which clogging, fluidity, and wax dispersibility can be sufficiently improved, even in a vehicle having a fine-mesh fuel filter in the fuel supply line. The agent for improving fluidity of a fuel oil comprises the following ester compound (A) and the following copolymer (B) wherein the mass ratio [(A)/(B)] of ester compound (A) and copolymer (B) is between 30/70 and 70/30. The ester compound (A) is represented by formula (I) where R1 is a C17-23 linear saturated alkyl group, (EO) is an oxyethylene group, and X, Y, and Z are integers of 1 or greater. Moreover, the average number of moles added of oxyethylene groups (n) satisfies n = (X+Y+Z)/3 and 1 = n = 3. (B) is a copolymer having a weight-average molecular weight between 5,000 and 50,000, which is obtained by polymerization of components (b1) through (b3) at a molar percentage of (b1)/(b2)/(b3) = 0.4 to 0.8/0.1 to 0.3/0.1 to 0.3. When the copolymer is determined by a differential scanning calorimeter, the exothermic peak temperature (Tp) obtained by cooling from 100ºC to -80ºC at a rate of 10ºC/minute is -40ºC = Tp = -15ºC. R2 is a C10-18 linear saturated alkyl group. R3 is a C8-16 linear saturated alkyl group. R4 is a C10-16 linear saturated alkyl group.