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Title:
METHOD FOR MANUFACTURING OPTICAL FILM, OPTICAL FILM, POLARIZING PLATE AND DISPLAY
Document Type and Number:
Japanese Patent JP2009114430
Kind Code:
A
Abstract:

To provide a cellulose ester-based optical film which is a melt-castable cellulose ester film, has a small retardation value and is excellent in surface quality and physical properties.

A method for manufacturing the optical film comprises the steps of: melt-casting a composition comprising the cellulose ester, which simultaneously satisfies the substitution degrees shown by expression (1): 2.50X+Y3.00, expression (2): 1.20X1.75 and expression (3): 1.00Y1.50 (wherein X is a substitution degree of an acetyl group; Y is a substitution degree of a propionyl group), and an ultraviolet-absorbing polymer to form a web; and stretching the obtained web to at least one direction by 1.2-5.0 times so that the obtained optical film satisfies 0Ro10 nm and -20Rth20 nm (wherein Ro is the in-plane retardation; and Rth is the retardation in the thickness direction) simultaneously.


Inventors:
SUZUKI TAKAYUKI
SUZUKI TAKASHI
Application Number:
JP2008247597A
Publication Date:
May 28, 2009
Filing Date:
September 26, 2008
Export Citation:
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Assignee:
KONICA MINOLTA OPTO INC
International Classes:
C08J5/18; B29C55/02; C08F216/36; C08F220/10; C08F220/54; C08F226/06; G02B5/30; G02F1/1335; B29K1/00; B29L7/00; B29L11/00
Domestic Patent References:
JP2007041280A2007-02-15
JP2006264312A2006-10-05
Foreign References:
WO2007066519A12007-06-14
WO2007108347A12007-09-27