Title:
CELLULOSE ESTER FILM AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/108323
Kind Code:
A1
Abstract:
This invention provides a process for producing a cellulose ester film suitable
as a protective film and a phase difference film in a polarizing plate in a liquid
crystal display device. In the production process, regarding foreign materials
attributable to the addition of fine particles contained in a cellulose ester
resin solution (dope), in a dope dissolution mixing step, the occurrence of foreign
materials is suppressed. According to the above constitution, the production
process can realize a reduction in the burden on a filter in a subsequent filtration
step, freedom from foreign materials, and excellent productivity. In the production
process of a cellulose ester film, fine particles are added in the step of dissolving
a cellulose ester resin in a main solvent at a temperature at or below the boiling
point of the main solvent under the atmospheric pressure, and, after the addition,
mixing is carried out at a temperature at or above the boiling point of the main
solvent. Preferably, the mixing is carried out in a temperature range of the
boiling temperature of the main solvent to a temperature of (boiling point of
the main solvent + 50ºC) fornot less than 60 min and not more than 300 min.
Inventors:
SUGIMOTO, Hideo (Inc. 2970 Ishikawa-machi, Hachioji-sh, Tokyo 05, 1928505, JP)
Application Number:
JP2007/054417
Publication Date:
September 27, 2007
Filing Date:
March 07, 2007
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; C08J5/18; B29K1/00; B29L7/00
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