Retardation film made by using cellulose derivatives
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United States of America Patent
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Aug 12, 2008
Grant Date -
Feb 15, 2007
app pub date -
Aug 26, 2004
filing date -
Aug 28, 2003
priority date (Note) -
Expired
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Abstract
The present invention relates to a retardation film obtained by subjecting a film formed from a cellulose derivative to an orientation treatment, wherein a hydroxyl group of cellulose is substituted by at least one kind of aliphatic acyl group having 5 to 20 carbon atoms, and a degree of substitution by said hydroxyl group is 1 to 3. According to the present invention, a retardation film having various wavelength dispersion characteristics, positiveness or negativeness in birefringence and viewing angle characteristics, in particular, an achromatic retardation film and a retardation film having a high birefringent property and the like can be obtained by preparing a retardation film using a properly selected said cellulose derivative as a raw material of the film.
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