Combinations of oil-soluble aliphatic copolymers with nitrogen derivatives of hydrocarbon substituted succinic acids are flow improvers for middle distillate fuel oils

摘要

Combinations of an oil-soluble aliphatic copolymer having the property of a nucleator for wax crystallization e.g., an ethylene-vinyl acetate copolymer having a number average molecular weight within the range of 500-50,000, in combination with an oil-soluble hydrocarbyl substituted succinic acid which has been reacted with a nitrogen material to form either an amine salt or an amide or a mixture thereof wherein the hydrocarbyl groups contain 8 to 28, preferably 12 to 22, carbon atoms are useful in improving the cold flow properties of distillate hydrocarbon oils.