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:
Sep. 24, 2013
Filed:
Sep. 17, 2002
Shuichi Sasahara, Nara, JP;
Kazuhiro Yosikawa, Nara, JP;
Shinichi Wakamatsu, Nara, JP;
Takahiko Fujita, Nara, JP;
Shuichi Sasahara, Nara, JP;
Kazuhiro Yosikawa, Nara, JP;
Shinichi Wakamatsu, Nara, JP;
Takahiko Fujita, Nara, JP;
Seikisui Plastics Co., Ltd., Osaka, JP;
Abstract
The invention aims at providing a polymeric hydrogel which is highly resistant to water washing. The aim is attained by a polymeric hydrogel comprising a polymeric matrix formed by copolymerizing a nonionic polymerizable monomer with a crosslinking monomer, characterized in that the polymeric matrix contains a wetting agent and water, at least 50 wt % of the wetting agent is constituted of a polymer prepared by polymerizing a polyhydric alcohol monomer component containing a trihydric or more alcohol monomer, and the polymer is a water-soluble one which has an average molecular weight of 150 to 4000 and satisfies the relationship: {(number of ether groups in the polymer+number of hydroxyl groups in the polymer)/number of carbon atoms present in the polymer}≧1/3.