Title:
位相差フィルム用セルロースジアセテート
Document Type and Number:
Japanese Patent JP4774121
Kind Code:
B2
Abstract:
To provide a cellulose acetate which gives a cellulose acetate optical film exhibiting optical properties as a result of stretching, in which the film shows excellent stretchability and gives a stretched film having excellent optical properties. Disclosed is a cellulose diacetate for a retardation film, having a total degree of acetyl substitution of from 2.27 to 2.56, in which the cellulose diacetate has a polydispersity Mw/Mn of more than 3.0 and 7.5 or less, a degree of substitution at the 6-position of from 0.65 to 0.85, a half height width of acetylation distribution of from 1.0 to 2.3, and a viscosity-average degree of polymerization of 182 or more and 213 or less. The cellulose diacetate for a retardation film preferably has a 6-percent viscosity of from 120 to 230 mPa·s and preferably has a weight-average molecular weight Mw of 205,000 or more and 235,000 or less.
Inventors:
Shu Shimamoto
Yuya Asumi
Yuya Asumi
Application Number:
JP2010019591A
Publication Date:
September 14, 2011
Filing Date:
January 29, 2010
Export Citation:
Assignee:
Daicel Chemical Industry Co., Ltd.
International Classes:
G02B5/30; C08B3/06; G02F1/13363
Domestic Patent References:
| JP2000137116A | ||||
| JP200262430A | ||||
| JP2002212338A | ||||
| JP2004323746A | ||||
| JP2009155555A |
Attorney, Agent or Firm:
Yukihisa Goto