发明名称 |
Cellulose diacetate for retardation film |
摘要 |
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. |
申请公布号 |
US8846900(B2) |
申请公布日期 |
2014.09.30 |
申请号 |
US201113395731 |
申请日期 |
2011.01.21 |
申请人 |
Daicel Corporation |
发明人 |
Shimamoto Shu;Asumi Yuya |
分类号 |
C08B3/06;A61K31/717;C08J5/18;G02B5/30;C08B15/02;C08L1/12 |
主分类号 |
C08B3/06 |
代理机构 |
Birch, Stewart, Kolasch & Birch, LLP |
代理人 |
Birch, Stewart, Kolasch & Birch, LLP |
主权项 |
1. A cellulose diacetate for a retardation film, the cellulose diacetate having a total degree of acetyl substitution of from 2.27 to 2.56, wherein the cellulose diacetate has
a polydispersity Mw/Mn of 3<Mw/Mn≦7.5, 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, said half height width of acetylation distribution being a width of an intermolecular acetylation distribution curve at a height which is half the peak height in the intermolecular acetylation distribution curve plotted with the abscissa indicating a degree of acetylation of the cellulose diacetate and the ordinate indicating an amount of the cellulose diacetate at the degree of acetylation, and a viscosity-average degree of polymerization from 182 to 213. |
地址 |
Osaka-Shi JP |