C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/6559
C08L 33/02 (2006.01) A61L 15/60 (2006.01) C08F 8/32 (2006.01) C08F 8/44 (2006.01) C08F 20/06 (2006.01) C08F 261/04 (2006.01) C08L 29/04 (2006.01)
Patent
CA 1134977
ABSTRACT OF THE DISCLOSURE A process is provided herein for producing highly water-absorbent hydrophilic gels. The process comprises polymerizing acrylic acid and/or methacrylic acid in the presence of polyvinyl alcohol to obtain a polymer (A). Polymer (A) is then subjected to neutralization followed by heat treatment or to heat treatment followed by neutralization. Alternatively a neutralized product of acrylic acid and/or methacrylic acid may be poly- merized in the presence of polyvinyl alcohol to obtain a polymer (B). Polymer (B) is then subjected to heat treatment. According to this inven- tion, the polymerization is carried out in an aqueous solution having a total concentration of acrylic acid and/or methacrylic acid or its neutra- lized product (the weight of the neutralized product is converted to the acid basis) and polyvinyl alcohol of 10 to 60% by weight, the heat treat- ment temperature is 50° to 150°C, and the weight ratio of polyvinyl- alcohol to acrylic acid and/or methacrylic acid or its salt (the weight of the neutralized product is converted to the acid basis) is 5 to 95: 95 to 5. The polymers are hydrophilic gels which can preferably be used as water-absorbent materials or gel materials used in a hydrated swollen state.
334966
Fujita Fumio
Kitamura Shuji
Nagase Tsuneyuki
Tamura Toshifumi
Marcus & Associates
Sumitomo Chemical Co. Ltd.
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