| abstract |
(57) [Summary] [Purpose] To obtain a fluidity improver for fuel oil, which has cloud point depressing ability, pour point depressing ability, and clogging point depressing ability and which can disperse precipitated wax and prevent sedimentation. [Structure] (A): Polymers 2 to 9 containing an imidized product or an amidated product of an unsaturated polycarboxylic acid, an acid anhydride or ester thereof and a primary amine as a monomer unit. 5% by weight, and (B): ethylene / monoolefin copolymer, ethylene / vinyl carboxylate copolymer, ethylene / alkyl (meth) acrylate copolymer, ethylene / styrene or its derivative copolymer, vinyl carboxylate / Alkyl (meth) acrylate copolymer, alkyl (meth) acrylate homopolymer, styrene / alkyl (meth) acrylate copolymer, vinyl naphthalene / alkyl (meth) acrylate copolymer, styrene or its derivative / vinyl carboxylate A fluidity improver for fuel oil, which comprises 98 to 5% by weight of a copolymer such as a copolymer. |