| 摘要 |
An alkaline mixture of a cross-linked carboxylic acid copolymer having improved performance under alkaline conditions, such as a pH of 10 or higher which is a copolymer of a monomeric mixture of 6.5 to 97 phr of a carboxylic acid and 0.5 to 30 phr of an N-substituted acrylamide, such as isopropyl acrylamide, diacetone acrylamide, t-octylacrylamide, or t-butylacrylamide, which copolymer is cross-linked with 0.05 to 5 percent by weight based upon the weight of the copolymer of a polyunsaturated cross-linking agent, and an alkali or alkaline earth hydroxide, carbonate, phosphate or amine.
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