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Title:
METHOD FOR PRODUCING WATER ABSORBENT POLYACRYLIC ACID (SALT) RESIN POWDER, AND WATER ABSORBENT POLYACRYLIC ACID (SALT) RESIN POWDER
Document Type and Number:
WIPO Patent Application WO/2011/126079
Kind Code:
A1
Abstract:
Disclosed is a method for producing a water absorbent resin powder that is improved in liquid permeability (SFC), while maintaining appropriate water absorption rate (FSR). Specifically disclosed is a method for producing a water absorbent polyacrylic acid (salt) resin powder, which comprises: a polymerization step of an aqueous solution of an acrylic acid (salt) monomer; a gel grinding step of a hydrous gel-like crosslinked polymer during the polymerization or after the polymerization; and a drying step after the gel grinding. In the gel grinding step, a hydrous gel-like crosslinked polymer having a resin solid content of 10-80% by weight is subjected to gel grinding with a gel grinding energy (GGE) of 18-60 (J/g), and following that the resulting is dried at a drying temperature of 150-250°C and then subjected to a surface treatment.

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Inventors:
MACHIDA SAYAKA
TORII KAZUSHI
SHIRAI YOKO
IKEUCHI HIROYUKI
SAKAMOTO SHIGERU
TACHI KOJI
NAKATSURU REIKO
Application Number:
PCT/JP2011/058829
Publication Date:
October 13, 2011
Filing Date:
April 07, 2011
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
MACHIDA SAYAKA
TORII KAZUSHI
SHIRAI YOKO
IKEUCHI HIROYUKI
SAKAMOTO SHIGERU
TACHI KOJI
NAKATSURU REIKO
International Classes:
C08F6/00; B29C48/345; B29C48/395; B29C48/92; C08J3/12; B29C48/04; B29C48/05; C08F220/06
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Other References:
MODERN SUPERABSORBENT POLYMER TECHNOLOGY, 1998, pages 197 - 199
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (JP)
Patent business corporation Hara [Kenzo] international patent firm (JP)
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