| 摘要 |
The invention relates to organic copolymers in free acid or salt form with recurring units of formula I <IMAGE> I in which R is an alkylene radical with 2 to 6 carbon atoms, R1 is a C1-20 alkyl-, cycloalkyl- or phenyl group, x, y and z are numbers from 0.01 to 100, m is a number from 1 to 100 and n is a number from 10 to 100, with the provisos, that i) the ratio of x to (y+z) is from 1:10 to 10:1 inclusive, ii) the ratio of z to y is from 3:1 to 100:1, and iii) m+n=15-100. The products of the invention are excellent superplasticizers and can be used as additives to cementitious mixes.
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