Title:
PHASE RETARDATION FILM MANUFACTURED FROM CELLULOSE DERIVATIVE
Document Type and Number:
WIPO Patent Application WO/2007/018267
Kind Code:
A1
Abstract:
Disclosed is a phase retardation film which is manufactured using a cellulose derivative
having a hydroxyl group substituted by an aliphatic acyl group having 5 to 20 carbon
atoms (A) at a substitution degree of 0.50 to 2.99 hydroxyl group per cellulose
monomer unit. The film has an optically biaxial property which satisfies the
following relationship: nx>ny>nz, wherein nx represents a refraction
index in the slow axis direction on the film surface; ny represents a refraction
index in the direction orthogonal to the slow axis direction on the film surface;
and nz represents a refraction index in the thickness-wise direction. The film
can be used as a phase retardation film for the compensation of VA mode. In such
a film, when black display is performed under the VA cell-undriven state, the
leakage of light occurring at the the observation at an inclined angle, which causes
the deterioration in contrast, can be largely prevented in a wide range to keep
a low brightness level, compared to conventional cellulose-containing phase
retardation film, leading to the attainment of a wide view angle.
Inventors:
FUJISAWA HIDEYOSHI (JP)
TANAKA KOUICHI (JP)
TANAKA KOUICHI (JP)
Application Number:
PCT/JP2006/315857
Publication Date:
February 15, 2007
Filing Date:
August 10, 2006
Export Citation:
Assignee:
NIPPON KAYAKU KK (JP)
POLATECHNO CO LTD (JP)
FUJISAWA HIDEYOSHI (JP)
TANAKA KOUICHI (JP)
POLATECHNO CO LTD (JP)
FUJISAWA HIDEYOSHI (JP)
TANAKA KOUICHI (JP)
International Classes:
G02B5/30; B29C55/12; C08J5/18; G02F1/13363; G02F1/1337; B29K1/00; B29L11/00; C08L1/08
Foreign References:
| JP2004177642A | 2004-06-24 | |||
| JP2005062424A | 2005-03-10 |
Attorney, Agent or Firm:
SAEKI, Norio (Aminosan Kaikan Building 15-, Nihonbashi 3-chome Chuo-ku Tokyo 27, JP)
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