Invention Grant
- Patent Title: Polarizing plate, manufacturing method thereof, optical film and image display
- Patent Title (中): 偏光板,其制造方法,光学膜和图像显示
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Application No.: US12744601Application Date: 2008-11-19
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Publication No.: US08551612B2Publication Date: 2013-10-08
- Inventor: Megumi Katou , Hiroaki Mizushima , Mie Nakata , Takemichi Yoshida
- Applicant: Megumi Katou , Hiroaki Mizushima , Mie Nakata , Takemichi Yoshida
- Applicant Address: JP Ibaraki-shi, Osaka JP Osaka-shi
- Assignee: Nitto Denko Corporation,Nippon Shokubai Co., Ltd.
- Current Assignee: Nitto Denko Corporation,Nippon Shokubai Co., Ltd.
- Current Assignee Address: JP Ibaraki-shi, Osaka JP Osaka-shi
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JP2007-310905 20071130
- International Application: PCT/JP2008/070990 WO 20081119
- International Announcement: WO2009/069516 WO 20090604
- Main IPC: G02F1/1335
- IPC: G02F1/1335 ; G02B5/30 ; B32B37/12

Abstract:
A polarizing plate of the present invention includes a polyvinyl alcohol-based polarizer; and transparent protective films provided on both sides of the polarizer with an adhesive layer interposed between the polarizer and each transparent protective film, wherein the transparent protective film on one side comprises a lactone ring structure-containing (meth)acrylic resin and has an in-plane retardation of less than 40 nm and a thickness direction retardation of less than 80 nm, and the transparent protective film on the other side is a retardation plate that comprises a cellulose ester and satisfies the relation: nx>ny>nz, wherein nx is a refractive index in an X-axis direction where the in-plane refractive index is maximum, ny is a refractive index in a Y-axis direction perpendicular to the X-axis, and nz is a refractive index in a Z-axis direction corresponding to the thickness direction. The polarizing plate can satisfy durability and display uniformity (unevenness).
Public/Granted literature
- US20100253884A1 POLARIZING PLATE, MANUFACTURING METHOD THEREOF, OPTICAL FILM AND IMAGE DISPLAY Public/Granted day:2010-10-07
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