摘要 |
PURPOSE:To obtain the titled substance having improved absorption of a salt- containing aqueous solution, and the water-absorption after heat-treatment, by graft-polymerizing acrylonitrile to decomposed starch in the presence of a specific monomer, and saponifying the copolymer containing a specific amount of said monomer with an alkali. CONSTITUTION:The objective substance can be produced by (1) copolymerizing (A) acrylonitrile to (B) decomposed starch (e.g. cyclodextrin, etc. preferably having a polymerization degree of 6-800) using cerric ammonium nitrate as a catalyst, in the presence of a monomer of formula (X is H or methyl; Y is acetoxyl or alkoxycarbonyl) (preferably methyl methacrylate, etc.) to obtain a copolymer containing <=15mol% said monomer based on the sum of acrylonitrile and said monomer, and (2) saponifying the obtained copolymer with an alkali. USE:Paper diaper, wet napkin, etc.
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