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Superabsorbent resin composition
| Details |
Inventors: Hosokawa, Yasunori; Igarashi, Tadashi; Tsuru, Isao; Hanada, Yoko;
Assignee: Kao Corporation (Tokyo, JP)
Primary Examiner: Reddick; Judy M.
Assistant Examiner:
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch, LLP
A superabsorbent resin composition comprising the following components components (A) and (D), wherein (A) is a superabsorbent resin, and (D) a coordination compound in which a chelating agent is coordinated with metal A. |
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DETAILED DESCRIPTION What is claimed is: 1.
A superabsorbent resin composition comprising components (A) and (D) wherein (A) is a superabsorbent resin selected from the group consisting of a crosslinked polyacrylic acid salt and a crosslinked starch-acrylic acid salt graft copolymer, and (D) is a coordination compound in which a chelating agent selected from the group consisting of a water-soluble inorganic phosphoric acid compound, an organic phosphorus compound and a compound serving as a surface active agent is coordinated with a metal selected from the group consisting of titanium and zirconium, wherein the amount of said chelating agent is 0.
01 to 5 parts by weight per 100 parts by weight of said superabsorbent resin, the molar ratio of said chelating agent to said metal is 0.
8 to 10.
2.
The superabsorbent resin composition according to claim 1, wherein said chelating agent is tripolyphosphoric acid, polyphosphoric acid, ethylenediaminetetraacetic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, a monoalkyl phosphate, 2-phosphonobutane-1,2,4-tricarboxylic acid, L-glutamic acid diacetic acid, N,N-Bis(carboxymethyl)-L-glutamic acid, hydroxyethylethylenediaminetriacetic acid or salts thereof.
3.
The superabsorbent resin composition according to claim 1, which is capable of holding 35 g/g or more of physiological saline after swollen with physiological saline for 30 minutes and dehydrated by centrifugation.
4.
A process for producing the superabsorbent resin composition as claimed in claim 1, comprising the steps of mixing together (A) the superabsorbent resin selected from the group consisting of a crosslinked polyacrylic acid salt and a crosslinked starch-acrylic acid salt graft copolymer and (D) the coordination compound in which a chelating agent selected from the group consisting of a water-soluble inorganic phosphoric acid compound, an organic phosphorus compound and a compound serving as a surface active agent is coordinated with the metal selected from the group consisting of titanium and zirconium
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