| abstract |
Products useful as additives for lowering the cloud point of middle distillates have a molecular weight from 1,000 to 50,000, and are obtained by reacting a compound of the formula R-Z-(CH2)nNH]mH(I) or HO-CH2-R'-NH2(II) where R is a monovalent saturated aliphatic radical of 1-30 carbon atoms, Z is -NH- or oxygen, n is 2 to 4, m is zero or 1 to 4 and R' is a saturated divalent aliphatic radical of 1-18 carbon atoms, with a copolymer comprising recurrent units (A) from an alkyl ester of an unsaturated monocarboxylic acid and/or a vinyl ester of a saturated monocarboxylic acid, recurrent units (B) from diisobutylene and recurrent units (C) from an unsaturated alpha , beta -dicarboxylic compound. |