| 摘要 |
PURPOSE:To obtain the title material excellent in water absorptivity, water absorption, gel strength and safety, and suitable for paper diapers, sanitary articles, etc., by reacting a polymeric compound having a COOH group in a side chain with a polyalcohol by heating. CONSTITUTION:A water-soluble polycarboxylic acid (salt) (A) of an average degree of polymerization of 1,000-100,000, which is a water-soluble polymeric compound having a COOH group in a side chain such as polyacrylic acid, alginic acid and/or salts thereof, is dissolved in water and 0.01-30pts.wt., per pt.wt. said polymeric compound, polyalcohol (e.g., glycerol or pentaerythritol) is dissolved homogeneously in the above obtained solution. An acid catalyst such as hydrochloric acid or p-toluenesulfonic acid is added to this solution, and the resulting solution is heated to 50-100 deg.C at a reduced pressure in a hermetically sealed vessel to effect the esterification, crosslinking and water- insolubilization of the compound.
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