Title:
METHOD FOR PRODUCING OPTICAL FILM
Document Type and Number:
WIPO Patent Application WO/2007/040129
Kind Code:
A1
Abstract:
A method for producing an optical film of good quality having uniform thickness by
which entrainment of bubbles is eliminated at a casting portion even in the case
of high-speed film formation without reducing pressure excessively when a film
formation rate is increased in a solution casting film forming method, and a stabilized
casting dope ribbon can be formed during dope casting. Dope is allowed to flow
from a casting die onto a traveling support and a film is formed while pressure
at the casting portion of the casting die is reduced by a pressure reducing means
installed on the rear side of the casting die in the advancing direction of the
support, wherein the temperature of the support during casting is set in a range
represented by expression (1). -0.01CS+0.005ΔP+5≤T≤-0.125×CS+0.04×ΔP+17...expression (1).
T represents the temperature (°C) of the support during cast, CS represents the
moving speed (m/min) of the support, and ΔP represents pressure reduction value
(Pa) by the pressure reducing means.
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Inventors:
NAGASHIMA, Katsusuke (Inc. 2970 Ishikawa-machi, Hachioji-sh, Tokyo 05, 1928505, JP)
Application Number:
JP2006/319250
Publication Date:
April 12, 2007
Filing Date:
September 28, 2006
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:
B29C41/28; B29C41/50; G02B5/30; B29L7/00; B29C41/00; B29C41/34; G02B5/30
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