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:
May. 16, 2006
Filed:
Dec. 28, 2000
Yoshinori Ishii, Moriyama, JP;
Takeshi Yamamoto, Moriyama, JP;
Takao Uesugi, Nakakubiki-gun, JP;
Koichi Watanabe, Joetsu, JP;
Yoshinori Ishii, Moriyama, JP;
Takeshi Yamamoto, Moriyama, JP;
Takao Uesugi, Nakakubiki-gun, JP;
Koichi Watanabe, Joetsu, JP;
Gunze Co., Ltd., Ayabe, JP;
Poratechno Co., Ltd., Niigata, JP;
Abstract
A polarizing plate with which, not only suppression in a drop in polarization efficiency, but also with which hue shift and light leakage do not substantially occur, under a high humidity/high temperature environment is provided. The polarizing plate of the present invention includes a polyvinyl-alcohol-based polarizing film, a protective film mainly composed of a cyclic-olefin-based resin and laminated on at least one side of the polarizing film, and an anchor coat agent film and an adhesive layer interposed between the polarizing film and the protective film. The amount of change in optical in-plane retardation of the protective film is 5 nm or less, after 24 hours in an atmosphere of 80° C., and the wetting tension of the laminated surface is 500 μN/cm (23° C.) or more. The anchor coat agent is made of polyester polyol and polyisocyanate, and the adhesive layer is made of polyvinyl-alcohol-based adhesive.