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:
Jun. 15, 2010
Filed:
Dec. 27, 2002
Masayoshi Handa, Himeji, JP;
Takayasu Taniguchi, Himeji, JP;
Yasuhiro Nawata, Himeji, JP;
Masato Fujikake, Himeji, JP;
Masayoshi Handa, Himeji, JP;
Takayasu Taniguchi, Himeji, JP;
Yasuhiro Nawata, Himeji, JP;
Masato Fujikake, Himeji, JP;
Sumitomo Seika Chemicals Co., Ltd., Kako-gun, JP;
Abstract
A process for preparing a water-absorbent resin made from an α,β-unsaturated carboxylic acid as an essential monomer characterized in that the process comprises allowing a metal chelating agent to be present at any step in the process in an amount of 0.001 to 6 parts by weight, based on 100 parts by weight of the α,β-unsaturated carboxylic acid; and adding a reducing agent or an oxidizing agent thereto in an amount of 0.001 to 6 parts by weight, based on 100 parts by weight of the α,β-unsaturated carboxylic acid before initiation of drying and/or during drying of a gelated product containing a water-absorbent resin obtained by polymerization.