| 摘要 |
A bifunctional anti-settling and dispersant additive for middle distillates from 150-450 DEG C petroleum fractions, characterised in that it consists of at least one modified copolymer with a weight-average molecular weight of 500-5000. In a first step, a first carboxylic acid is copolymerised with an alkylated ester of a second carboxylic acid which is the same as or different from the first, and in a second step, the carboxylic groupings of the resulting copolymer are amidified at a temperature of 100-200 DEG C using a polyamine of formula (II), wherein n and m are from 1 to 8, and R and R' are preferably alkyl groupings.
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