| 摘要 |
PCT No. PCT/FR96/00893 Sec. 371 Date Feb. 20, 1998 Sec. 102(e) Date Feb. 20, 1998 PCT Filed Jun. 12, 1996 PCT Pub. No. WO96/41850 PCT Pub. Date Dec. 27, 1996A bifunctional anti-settling and dispersant additive for middle distillates from 150-450 DEG C. petroleum fractions, characterized in that consists of at least one modified copolymer with a weight-average molecular weight of 500-5000 prepared as follows: in a first step, a first carboxylic acid is copolymerized 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 re amidified at a temperature of 100-200 DEG C. wherein n and m are from 1 to 8, and R and R' are preferably alkyl groupings.
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