COPOLYMER HAVING NITROGEN-CONTAINING FUNCTIONAL GROUP HYDROCARBON INTERMEDIATE FRACTION COMPOSITION CONTAINING SAME AS CLOUDING POINT LOWERING AGENT

摘要

Copolymers with nitrogen groups are used as additives to lower the cloud point and improve the filterability limit temperature and the pour point of middle distillates such as gas oils. They are obtained by reacting a compound having a primary amine group with a copolymer comprising 15 to 40% of recurrent units form a linear alpha -olefin, 20 to 70% of recurrent units form and alpha , beta -unsaturated dicarboxylic compound and 15 to 45% of recurrent units form an alkyl ester of unsaturated monocarboxylic acid.