FUEL OIL HAVING IMPROVED COLD FLUIDITY

摘要

PROBLEM TO BE SOLVED: To provide an additive that shows excellent performance to a mineral oil and a middle distillate with improved cold fluidity as well as providing cold fluidity improvement, and excellently dissolves in a middle distillate having a small content of sulfur and aromatic compounds even at a low mixing temperature.SOLUTION: In a fuel oil obtained by adding a copolymer of a small quantity of ethylene and vinyl ester to a middle distillate having a sulfur content of 350 ppm at the maximum and an aromatic compound content of 22 wt.% at the maximum, the copolymer has (a) a divalent structural unit induced from ethylene, (b) a 5-12 mol% divalent structural unit induced from vinyl ester of carboxylic acid having a branched saturated alkyl group with the number of carbon atoms of 5-18 and (c) a 4-13 mol% divalent structural unit induced from vinyl acetate, and the total mole ratio of the structural units of (b) and (c) is 12-16 mol%.