Title:
セルロース誘導体を用いた位相差フィルム
Document Type and Number:
Japanese Patent JP4802186
Kind Code:
B2
Abstract:
A retardation film having biaxial or achromatic properties, which is produced by uniaxially stretching a film made of either a cellulose derivative wherein hydroxyl groups are replaced by acyl having 5 to 20 carbon atoms, preferably 7 to 20 carbon atoms, still preferably 8 to 20 carbon atoms or a product of crosslinking of the cellulose derivative. The retardation film exhibits negative birefringence and excellent optical characteristics, can be easily produced by uniaxial stretching, and is improved in heat resistance or tear strength which conventional cellulose ester films are problematic in.
Inventors:
Yoshitaka Ohashi
Koichi Tanaka
Fujisawa Hideyoshi
Koichi Tanaka
Fujisawa Hideyoshi
Application Number:
JP2007504725A
Publication Date:
October 26, 2011
Filing Date:
February 21, 2006
Export Citation:
Assignee:
NIPPON KAYAKU KABUSHIKI KAISHA
Pola Techno Co., Ltd.
Pola Techno Co., Ltd.
International Classes:
G02B5/30; B29C55/04; C08J5/18; G02F1/1335; G02F1/13363; B29K1/00; B29L7/00; B29L11/00
Domestic Patent References:
| JP2005042039A | 2005-02-17 | |||
| JP2004198904A | 2004-07-15 | |||
| JP4681452B2 | 2011-05-11 | |||
| JP2001055402A | 2001-02-27 |
Attorney, Agent or Firm:
Norio Saeki