Process for producing water-absorbent resin

Details Process for producing water-absorbent resin Process for producing water-absorbent resin

1992-12-14

1994-01-25

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526320, C08F12010

Patent

active

052816834

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 R.sup.1 and R.sup.2 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.dbd.CH--CO--O).sub.L -- and l=1-5, a structural unit (B) of --(CH.sub.2 CH.sub.2 O).sub.m -- and m=2-100, and a structural unit (C) of --(R.sup.3 O).sub.n -- and n=0-20, in which R.sup.3 is a C.sub.3 -C.sub.4 alkylene.

REFERENCES:
patent: 4302381 (1981-11-01), Omura et al.
patent: 4351922 (1982-09-01), Yoshida et al.
patent: 4452996 (1984-06-01), Yokoshima et al.
patent: 4912185 (1990-03-01), Toh

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