Process for producing water-absorbent resin

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United States of America Patent

PATENT NO 10065173
APP PUB NO 20160030919A1
SERIAL NO

14759762

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Abstract

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The present invention provides a process for producing a water-absorbent resin, characterized in that a reverse-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer is carried out in a hydrocarbon dispersion medium comprising a dispersion stabilizer while an azo-based compound and a peroxide are combined in the presence of an internal-crosslinking agent, in that the following formulae are satisfied,

description='In-line Formulae' end='lead'0.10≤B/(A+B)  (1), anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'0.055≤B+9×C≤0.120  (2),description='In-line Formulae' end='tail'

    wherein A mol, B mol and C mol represent used amounts of the azo-based compound, the peroxide and the internal-crosslinking agent, respectively, relative to 100 mol of the water-soluble ethylenically unsaturated monomer used in the polymerization, and in that a post-crosslinking reaction is carried out by adding a post-crosslinking agent after the polymerization. The present invention also relates to a water-absorbent resin having specific performance and produced by the process.

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Patent Owner(s)

  • SUMITOMO SEIKA CHEMICALS CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hinayama, Tetsuhiro Hyogo, JP 15 52
Murakami, Masahiro Hyogo, JP 132 769
Takatori, Junichi Hyogo, JP 31 122

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