Title:
PROCESS FOR PRODUCTION OF CELLULOSE ACETATE FILM, CELLULOSE ACETATE FILM, AND POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE EACH EQUIPPED WITH THE FILM
Document Type and Number:
WIPO Patent Application WO/2012/002090
Kind Code:
A1
Abstract:
Disclosed are: a process for producing a cellulose acetate film that has excellent haze and internal diffusion properties even when stretched at a high draw ratio and has high contrast when used in a polarizing plate or a liquid crystal display device; a cellulose acetate film; and a polarizing plate and a liquid crystal display device, each of which is equipped with the film. The process for producing a cellulose acetate film can produce a cellulose acetate film by a solution casting method using a dope comprising a solvent and a cellulose acetate having a degree of substitution by an acetyl group of 2.0-2.5, and is characterized in that the water content of the dope during casting is adjusted to 1.5 to 5 mass% inclusive, the dope is agitated at a temperature ranging from a temperature equal to or higher than the boiling point of the solvent at ambient pressure to a temperature higher by 50°C than the boiling point of the solvent at ambient pressure inclusive while shearing at a shear rate of 2×103 to 2×104 s-1 and is subsequently formed into a film, and the film is stretched.
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Inventors:
SERA Takashi (Inc. 2970, Ishikawa-machi, Hachioji-sh, Tokyo 05, 〒1928505, JP)
Application Number:
JP2011/062444
Publication Date:
January 05, 2012
Filing Date:
May 31, 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:
B29C41/24; B29C55/08; C08J5/18; G02B5/30; G02F1/1335; B29K1/00; B29L7/00; B29L11/00
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Claims: