Liquid crystal material, method for producing liquid crystal...

Details Liquid crystal material, method for producing liquid crystal... Liquid crystal material, method for producing liquid crystal...

2005-07-15

2009-11-10

Wu, Shean C (Department: 1795)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299610, C252S299630, C568S661000, C568S664000, C568S669000, C570S128000, C570S131000, C349S182000

Reexamination Certificate

active

07615262

ABSTRACT:
The present invention provides a liquid crystal material, method for producing the liquid crystal material, and liquid crystal device thereof which shows low light absorption in the ultraviolet light region. A compound of formula (I)wherein R is an alkyl or alkenyl group which is optionally interposed with one or more oxygen or sulphur atoms, Y is independently selected from oxygen or sulphur, n is an integer of from 2 to 8, X is a direct bond, C1-4alkylene or C2-4alkenylene, and A is selected from a various specified ring structures. The liquid crystal material (compounds) are of low birefringence and are U.V. stable and are useful in liquid crystal devices that need low birefringence such as reflective displays, or which are exposed to high levels of U.V. light such as phosphor display cells.

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