Invention Grant
- Patent Title: Method of producing a retardation plate, retardation plate, polarizing plate with a retardation plate, liquid crystal panel, and liquid crystal display apparatus
- Patent Title (中): 相位差板，相位差板，具有相位差板的偏光板，液晶面板，液晶显示装置的制造方法
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Application No.: US12159898Application Date: 2007-01-15
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Publication No.: US08435598B2Publication Date: 2013-05-07
- Inventor: Kanako Itou
- Applicant: Kanako Itou
- Applicant Address: JP Ibaraki-shi, Osaka
- Assignee: Nitto Denko Corporation
- Current Assignee: Nitto Denko Corporation
- Current Assignee Address: JP Ibaraki-shi, Osaka
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JP2006-020885 20060130
- International Application: PCT/JP2007/050387 WO 20070115
- International Announcement: WO2007/086265 WO 20070802
- Main IPC: B05D5/06
- IPC: B05D5/06 ; B05D3/02 ; B05D3/00
Abstract:
A method of producing a retardation plate includes the steps of applying a solution containing a resin B and a solvent to an optical base material containing a resin A to obtain a laminate including an optical base material layer and an application layer, and stretching the laminate, in which one of the resin A and the resin B has positive alignment birefringence, and another one of the resin A and the resin B has negative alignment birefringence, and the stretching is performed by setting an amount of a residual solvent in the laminate to be 2 to 10% by weight.
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