| 摘要 |
<p>PCT No. PCT/FR96/01309 Sec. 371 Date Sep. 18, 1998 Sec. 102(e) Date Sep. 18, 1998 PCT Filed Aug. 22, 1996 PCT Pub. No. WO97/08217 PCT Pub. Date Mar. 6, 1997(Meth)acrylic copolymers of general formula in which: the M+ are monovalent cations arising from the neutralization of the -COOH groups, it being possible, however, for this neutralization to have been only partial; R1 and R2 are chosen from: hydrogen, long-chain linear or branched cycloalkyl or alkyl radicals and aryl radicals having from 8 to approximately 22 carbon atoms, with the condition that at least one of R1 and R2 is not hydrogen; R3 and R4 are independently chosen from: the hydrogen atom, short-chain cycloalkyl or alkyl radicals having from 1 to 7 carbon atoms and aryl radicals having from 6 to 7 carbon atoms; R5, R6, and R7 are each, independently of one another, chosen from the hydrogen atom and the methyl radical; tau 1 is the molar level of long-chain amide units in the copolymer; and tau 2 is the molar level of short-chain amide units optionally present in the copolymer. Their weight-average molar mass does not exceed 30,000 and tau 1 is between 0.01 and 0.30.</p> |
