The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 1994
Filed:
Dec. 14, 1992
Kazutaka Yano, Himeji, JP;
Yoshio Irie, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
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.