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. 04, 1983
Filed:
Dec. 02, 1981
Shuji Kitamura, Ibaraki, JP;
Fumio Fujita, Takatsuki, JP;
Toshihiro Oonishi, Takatsuki, JP;
Yoshiharu Tatsukami, Niihama, JP;
Masato Ogura, Niihama, JP;
Masahiro Niwano, Niihama, JP;
Masaru Oota, Niihama, JP;
Toshifumi Tamura, Takatsuki, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
The invention is to provide the methods for producing highly water-absorbable and water-retainable hydrogels having a large particle diameter together with a sufficient gel strength. The method is characterized by use of a specific dispersing agent in the water-in-oil type inverse phase suspension polymerization of an .alpha.,.beta.-unsaturated carboxylic acid and/or its alkali metal salt. Due to the high water-absorbability and water-retainability, along with the superior gel strength and the stable gel structure, the hydrogels of the invention enlarge the conventional range of usages.