Title:
METHOD FOR PRODUCING OPTICAL FILM, OPTICAL FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/118145
Kind Code:
A1
Abstract:
Disclosed is a method for producing an optical film by a solution casting film forming process wherein a resin solution that contains an acrylic resin and a cellulose ester resin at a mass ratio from 95:5 to 30:70 is used as a dope, said method comprising: a first stretching step wherein a film separated from a supporting body is MD stretched; a second stretching step wherein the film stretched in the first stretching step is TD stretched; a cutting step wherein both end portions of the film stretched in the second stretching step are cut off; and a third stretching step wherein the film, from which the cut end portions have been removed, is MD stretched. If the content of the acrylic resin is represented by A mass%, the total of the drawing ratio in the first stretching step and the drawing ratio in the third stretching step is from A/3 + 10 to A/5 + 40 in percentage. The drawing ratio in the first stretching step is 70-95% of the total drawing ratio in the machine direction of the film.
Inventors:
SUZUKI, Kazuyoshi (INC. 2970, Ishikawa-machi, Hachioji-sh, Tokyo 05, 〒1928505, JP)
Application Number:
JP2011/001416
Publication Date:
September 29, 2011
Filing Date:
March 10, 2011
Export Citation:
Assignee:
KONICA MINOLTA OPTO, INC. (2970, Ishikawa-machi Hachioji-sh, Tokyo 05, 〒1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 〒1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 〒1928505, JP)
International Classes:
G02B5/30; B29C55/14; C08J5/18; C08L1/10; C08L33/04; G02F1/1335; B29K1/00; B29K33/00; B29L7/00; B29L11/00
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (Osaka Nakanoshima Building 2nd Floor, 2-2 Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, 〒5300005, JP)
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Claims: