| 摘要 |
Novel polymeric compounds having a number-average molecular weight in the range 2000 to 10,000 are produced by the condensation of one or more primary amine compounds of formula R-Z[-(CH2)n-NH-]m-H (I> and/or HO-CH2-R''-NH2 (II> where, in formula (I), R represents a univalent saturated C1-30 aliphatic radical, Z is an oxygen atom, an imino group or a bivalent group =NR', in which R' is a univalent C1-30 aliphatic radical, preferably straight chain and preferably containing from 12 to 24 carbon atoms; n is 2, 3 or 4 and m is 0, 1, 2, 3 or 4, provided that m is not 0 unless Z is imino; and, in Formula II, R'' is a bivalent saturated C1-18 aliphatic radical, preferably straight-chain, on a copolymer formed between: (A) vinyl acetate, and (B) at least one unsaturated alpha , beta - dicarboxylic compound that may be a dicarboxylic acid, a diester of such an acid or an anhydride. Alternatively, such copolymers may be prepared by pre-reacting (B) with the amino compound and then polymerising the product with vinyl acetate. Such compounds are added to middle hydrocarbon distillates, especially gas oils, to lower their cloud point. The compounds also have other effects on such distillates. |
