Maleinsäure-Anhydrid-Copolymere.

摘要

A maleic anhydride copolymer comprising maleic anhydride units (I), conjugated diene units (II) and aliphatic monoolefin units (III) is provided. This copolymer has the weight-average molecular weight of from 500 to 50000. The molar ratio of unit (I)/(unit (II) + unit (III)) ranges from 30/70 to 90/10 and the molar ratio of unit (II)/unit (III) ranges from 5/95 to 90/10. A hydrolyzed prodcut of the copolymer or a water-soluble maleic acid copolymer is also provided. The hydrolyzed product is advantageously used as scale inhibitor , dispersant for calcium carbonate or additive for cement and concrete.