Retardation film made by using cellulose derivatives

Details Retardation film made by using cellulose derivatives Retardation film made by using cellulose derivatives

2004-08-26

2008-08-12

Hendricks, Keith D. (Department: 1794)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With viewing layer of specified composition

C428S001540, C349S096000, C349S117000, C536S063000, C536S076000

Reexamination Certificate

active

07410680

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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Cellulosic Polymers Blends and Composites; Richard D. Gilbert; Hanser Gardner Publications, pp. 25-94, 1994.
The International Search Report dated Dec. 14, 2004.

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