Title:
OPTICAL FILM
Document Type and Number:
Japanese Patent JP2003183328
Kind Code:
A
Abstract:
To provide an optical film having heat resistance and excellent transparency.
The optical film is made from a polymer obtained by polymerizing 4,4-diacetyl-2,6-bis(methoxycarbonyl)-1,6-heptadiene or 4-acetyl-4- ethoxycarbonyl-2,6-bis(methoxycarbonyl)-1,6-heptadiene. Because the polymer has good moldability to films and gives a film having good transparency and a low phase difference, it is desirable for optical films. It is desirable that the polymer has a glass transition temperature of 120-250°C and a number- average molecular weight of 20,000-500,000.
Inventors:
OZAWA SHINJI
Application Number:
JP2001385972A
Publication Date:
July 03, 2003
Filing Date:
December 19, 2001
Export Citation:
Assignee:
KANEGAFUCHI CHEMICAL IND
International Classes:
G02B5/30; C08F36/20; C08J5/18; G02B1/04; (IPC1-7): C08F36/20; C08J5/18; G02B1/04; G02B5/30