LOW-TEMPERATURE FLUIDITY MODIFIER FOR MEDIUM FRACTION PETROLEUM FUEL AND MEDIUM FRACTION PETROLEUM FUEL COMPOSITION CONTAINING SAME

摘要

PURPOSE:The titled composition with excellent low-temp. fluidity characteristics and low-temp. shelf stability, prepd. by incorporating an esterified material obtd. by esterifying a specified olefin/maleic anhydride copolymer. CONSTITUTION:An olefin/maleic anhydride copolymer of average MW 500- 50,000 obtd. by reacting an 8-19C straight-chain alpha-olefin such as 1-octene with maleic anhydride in a molar ratio of 1:0.5-2 at 50-250 deg.C is esterified with a 16-30C long-chain alcohol to obtain a low-temp. fluidity modifier (B) consisting of an esterified material in which m/n, a ratio of the number of structural units of formula I to that of formula II (wherein m and n are each an integer; R1, R2, R4 and R5 are each H or alkyl; R3, R6 and R7 are each alkyl) is 0.25-4. Then to a medium petroleum distillate fuel (A) of a b.p. ranging from 120 to 500 deg.C, such as diesel fuel oil, is added 0.005-5wt% component B.