Chiral dopant with phenylethanediol functionality

Details Chiral dopant with phenylethanediol functionality Chiral dopant with phenylethanediol functionality

2007-08-28

2007-08-28

Wu, Shean C (Department: 1756)

Compositions

Liquid crystal compositions

Cholesteric liquid crystal composition containing a sterol...

C252S299670, C428S001100, C428S001300, C560S181000, C560S183000

Reexamination Certificate

active

10519604

ABSTRACT:
The invention pertains to a phenylethanediol derivative having at least one polymerizable group, characterized in that the phenylethanediol derivative further comprises at least one photo-convertible group for adjusting the helical twisting power of the phenylethanediol derivative. According to a preferred embodiment the phenylethanediol has the formulawhereinA stands for a bond or a p-phenylene group;B and B′ are independently (O)p—CoH2o—O—CO—CR′═CH2, o being 2-12, p being 0 or 1, and R′ being H or CH3;P stands for a CH2or a C═O group;Q and Q′ are independently selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN;n is an integer from 1 to 3; andm is an integer from 0 to 2; and:whereinA stands for a bond or a p-phenylene group;B is (O)p—CoH2o—O—CO—CR′═CH2, o being 2-12, p is 1, and R′ being H or CH3;P stands for a CH2or a C═O group;Q is selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN; andm is an integer from 0 to 2.

REFERENCES:
patent: 6849203 (2005-02-01), Farrand et al.
patent: 6953611 (2005-10-01), Hammond-Smith et al.
patent: 2004/0026660 (2004-02-01), Vaughan-Spickers et al.
patent: WO 02/40614 (2002-05-01), None
J. A. Rego et al: “Synthesis of Chrial Networks for Polymer Stabilized Cholesteric Texture (PSCT) Displays” Apr. 1997.

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