Process for producing water-absorbent resin
First Claim
1. A process for producing a water-absorbent resin, comprising polymerizing a water-soluble monoethylenic unsaturated monomer in the presence of a crosslinking agent, wherein said crosslinking agent is a compound represented by the following formula ##STR9## wherein R1 and R2 denote a hydrogen atom or a methyl group independently;
- X denotes a divalent, straight chain organic group comprising structural units A, B and optionally C, whereinA is 1 to 5 units of --CO--CH═
CH--CO--O--,B is 2 to 100 units of --CH2 CH2 O--, andC is 0 to 20 units of --R3 O--, wherein R3 is a branched or straight chain C3 -C4 alkylene, with the provisos (i) that B should be located on both sides of structural unit A when X includes structural units A and B, but not C, and (ii) that at least one of B and C may be located on both sides of structural unit A when X includes A, B and C.
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Abstract
A water-absorbent resin having high absorption capacity and a slight amount of water-soluble ingredients is produced by a process, which includes polymerizing a water-soluble monoethylenic unsaturated monomer in the presence of a crosslinking agent, and using a bifunctional compound represented by the following general formula 1 as the crosslinking agent; ##STR1## wherein R1 and R2 are a hydrogen atom or a methyl group independently, and --(X)-- is a divalent organic group combined in a straight chain type by an optional arrangement of a structural unit (A) of --(CO--CH═CH--CO--O)L -- and l=1-5, a structural unit (B) of --(CH2 CH2 O)m -- and m=2-100, and a structural unit (C) of --(R3 O)n -- and n=0-20, in which R3 is a C3 -C4 alkylene.
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Citations
4 Claims
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1. A process for producing a water-absorbent resin, comprising polymerizing a water-soluble monoethylenic unsaturated monomer in the presence of a crosslinking agent, wherein said crosslinking agent is a compound represented by the following formula ##STR9## wherein R1 and R2 denote a hydrogen atom or a methyl group independently;
X denotes a divalent, straight chain organic group comprising structural units A, B and optionally C, wherein A is 1 to 5 units of --CO--CH═
CH--CO--O--,B is 2 to 100 units of --CH2 CH2 O--, and C is 0 to 20 units of --R3 O--, wherein R3 is a branched or straight chain C3 -C4 alkylene, with the provisos (i) that B should be located on both sides of structural unit A when X includes structural units A and B, but not C, and (ii) that at least one of B and C may be located on both sides of structural unit A when X includes A, B and C. - View Dependent Claims (2, 3, 4)
Specification