Polymer-dispersed liquid crystal material and process

Details Polymer-dispersed liquid crystal material and process Polymer-dispersed liquid crystal material and process

1993-12-06

1996-02-27

Tucker, Philip

Compositions

Liquid crystal compositions

428 1, C09K 1952

Patent

active

054946042

ABSTRACT:
The present invention provides an improved liquid crystal material comprising a liquid crystal material dispersed in a polymer matrix. The polymeric matrix can be a thermal-based system such as an epoxy-based thermal polymeric system or a UV-curable system such as an acrylate-based polymeric system. The polymeric matrix has a crosslinking density which minimizes the driving voltage while maintaining a good contrast ratio. A process using dynamic mechanical analyzer (DMA) testing identifies a T.sub.g and crosslinking density which are employed to determine the optimum degree of crosslinking.

REFERENCES:
"Polymer-Dispersed Liquid Crystals" West, pp. 475-495 in Liquid Crystalline Polymers Edit by Weiss & Ober. 1990 ACS Symposium Series 435.

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