Title:
PROCESS FOR PRODUCING OPTICAL FILM
Document Type and Number:
WIPO Patent Application WO/2016/163213
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a process for producing an optical film which comprises a cycloolefin resin, has a retardation suitable for VA-mode liquid-crystal display devices, and has excellent bondability with a UV adhesive in polarizer production and which, when produced, is wound into a roll with a stable shape.
The process according to the present invention is a process for producing an optical film by a solution casting method, and is characterized by comprising a step in which a dope comprising a cycloolefin resin, a matting agent, and an organic solvent is prepared, a step in which the dope is cast on a support to form a web and the web is dried on the support and then separated from the support to obtain a film, and a step in which the separated film is stretched, the residual solvent content at the time of initiation of the stretching in the step for stretching the film being regulated to 1 mass% or higher but less than 15 mass%.
Inventors:
MORITA RYO (JP)
Application Number:
PCT/JP2016/058249
Publication Date:
October 13, 2016
Filing Date:
March 16, 2016
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G02B5/30; B29C41/24; B29C41/52; B29C55/12; C08J5/18; B29L7/00; B29L11/00
Foreign References:
JP2007098643A | 2007-04-19 | |||
JP2008280403A | 2008-11-20 | |||
JP2004151640A | 2004-05-27 | |||
JP2004029660A | 2004-01-29 | |||
JP2016014869A | 2016-01-28 | |||
JP2016074776A | 2016-05-12 |
Attorney, Agent or Firm:
KOYO INTERNATIONAL PATENT FIRM (JP)
Patent business corporation Mitsuaki international patent firm (JP)
Patent business corporation Mitsuaki international patent firm (JP)
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