Title:
WATER-ABSORBING RESIN COMPOSITION
Document Type and Number:
Japanese Patent JP3157408
Kind Code:
B2
Abstract:
PURPOSE: To obtain a water-absorbing resin composition of a low residual monomer content by adding a water-soluble thiol compound represented by a specified formula to a water-containing water-absorbing resin gel obtained by polymerizing a water-soluble monomer having a polymerizable unsaturation and a polysaccharide in the presence of a crosslinking agent and dry-grinding the mixture.
CONSTITUTION: A water-soluble monomer (A) having a polymarizable unsaturation (e.g.(meth)acrylic acid) is mixed with 0.001-10wt.% crosslinking agent (C) (e.g. methylenebisacrylamide) and 0-3wt.% polysaccharide. A redox catalyst comprising H2O2 and ascorbic acid or a reasnbling catalyst is added to the obtained mixture, and the resultant mixture is polymerized and them aged to obtain a water-containing water-absorbing resin gel (D). The water-containing gel (D) is broken, mixed with an aqueous NaOH solution and 0.001-8wt.%, based on the total of components A and C, water-soluble thiol compound represented by, for example, formula I (wherein R1 is H or CH3l (n) is a positive number; X1 is H or a group of formula II or a 1-4 C alkyl) and having a solubility of 10wt.% or above in a 20wt.% aqueous sodium acetate solution, dried by heating and ground to obtain a water-absorbing resin composition having a residual monomer content of 500ppm or below and a water-soluble component content of 7wt.% or below.
Inventors:
Keiji Tanaka
Masashi Date
Tomoyuki Tamabuchi
Go Yuki
Kenjiro Tsubota
Masashi Date
Tomoyuki Tamabuchi
Go Yuki
Kenjiro Tsubota
Application Number:
JP33060894A
Publication Date:
April 16, 2001
Filing Date:
December 06, 1994
Export Citation:
Assignee:
SANYO CHEMICAL INDUSTRIES,LTD.
International Classes:
A61F13/53; A61F13/49; A61L15/60; B01J20/26; C08F20/04; C08F251/00; C08K5/37; C08K5/372; C08L101/00; C08L101/14; (IPC1-7): C08L101/14; B01J20/26; C08K5/37
Domestic Patent References:
| JP4880640A | ||||
| JP6240151A | ||||
| JP5112654A | ||||
| JP6509167A |
Other References:
【文献】国際公開91/3497(WO,A1)