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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.:

US 5508381 B1

PDFFull Text
Date of Patent:
Apr. 16, 1996

Filed:

Jun. 15, 1994

Process for preparing highly water absorbent resin

Applicant:
Inventors:

Tae-Hwan Jang, Daejeon, KR;

Su-Beom Choi, Daejeon, KR;

Hyung-Mann Lee, Daejeon, KR;

Myung-Joong Kim, Daejeon, KR;

Assignee:

Lucky Limited, Seoul, KR;

Attorney:

Baker & Daniels

Primary Examiner:

John C Bleutge

Assistant Examiner:

D R Wilson

Int. Cl.
CPC ...
C08L / ;
U.S. Cl.
CPC ...
525119 ; 604372 ;
Abstract

The present invention provides an improved process for preparing a highly water absorbent resin having a superior suction power and excellent gel strength, which consists essentially of: (1) neutralizing acrylic acid to a neutralization degree ranging from 50 to 100% based on the total number of moles of the acid employed and polymerizing it by a reverse phase suspension polymerization to provide a neutralized polymer; (2) dehydrating the polymer until its water content reaches 25% by weight or less based on the weight of the polymer through an azeotropic distillation thereof in the presence of a lipophilic solvent; (3) crosslinking the dehydrated polymer in the presence of a hydrophilic crosslinking agent containing at least two epoxy groups in an amount ranging from 0.05 to 5.0% by weight and water added in an amount ranging from 7.0 to 25.0% by weight based on the weight of the dehydrated polymer; (4) dehydrating the crosslinked polymer until 60% by weight or more of the amount of water added in step(3) above is removed through an azeotropic distillation thereof under reflux; and (5) recovering the crosslinked and dehydrated polymer by filtration.

Find Patent Forward Citations

Jang, Tae-Hwan. (1996). Process for preparing highly water absorbent resin (U.S. Patent No. 5508381). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5508381

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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