Process for preparing highly water-absorbent resin
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United States of America Patent
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Mar 3, 1987
Grant Date -
N/A
app pub date -
Sep 11, 1985
filing date -
Sep 19, 1984
priority date (Note) -
Expired
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Abstract
A process for preparing a highly water-absorbent resin by a reversed-phase suspension polymerization method using an aqueous solution of a monomer containing an alkali metal salt of acrylic or methacrylic acid, water-soluble polymerization initiator, protective colloid, hydrophobic organic solvent and if required, dispersing agent, the process being characterized in that the protective colloid is a copolymer comprising: (A) about 50 to about 97 mole % of styrene and/or alkyl-substituted derivative thereof, (B) 0 to about 50 mole % of dialkylaminoalkyl acrylate or methacrylate and/or dialkylaminoalkyl acrylamide or methacrylamide, (C) about 3 to about 15 mole % of glycidyl acrylate and/or glycidyl methacrylate and (D) 0 to about 30 mole % of an unsaturated monomer which can be copolymerized with the component A, B or C.
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