| 摘要 |
PURPOSE:To produce the titled polymer of a high water absorption rate and a high gel strength upon absorption of water, by treating a highly water- absorptive polymer containing carboxyl and/or carboxylate groups with a specified silane coupling agent in the presence of water. CONSTITUTION:A dried highly water-absorptive polymer containing carboxyl and/or carboxylate groups, such as a (meth)acrylic acid (salt) polymer or a saponificate of starch/acrylonitrile graft polymer, is mixed with a mixture of 0.5-300wt% water and 0.001-10.0wt% silane coupling agent of the formula: XRSiYn (wherein X is a functional group reactive with the functional group of the highly water-absorptive polymer, R is an organic group, Y is a hydrolyzable group and n is 1-3), and the resulting mixture is heated to 20-180 deg.C to evaporate water.
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