| 摘要 |
PURPOSE:To obtain a polymer having remarkably excellent rate of water- absorption and gel strength, and useful as a water-absorbing material for paper diaper, etc., by crosslinking the surface of a highly water-absorbing polymer with a specific crosslinking agent in the presence of water, and at the same time, introducing OH group to the surface of the polymer. CONSTITUTION:The surface of a highly water-absorbing polymer containing carboxyl group and/or carboxylate group as a constituent component of the (co)polymer (e.g. acrylic acid, alkali metal methacrylate, etc.) is treated with one or more crosslinking agents selected from trimethylolpropane diglycidyl ether, diglycerol diglycidyl ether, diglycerol triglycidyl ether, and sorbitol di(or tri or tetra)glycidyl ether, in the presence of water. The surface is crosslinked and at the same time, OH group is introduced to the surface of the polymer by this process.
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