Optically erasable read-and-write liquid crystal/side-chain liqu

Details Optically erasable read-and-write liquid crystal/side-chain liqu Optically erasable read-and-write liquid crystal/side-chain liqu

1993-09-15

1996-01-23

Wu, Shean

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229967, C09K 1912, C09K 1920

Patent

active

054863112

ABSTRACT:
An optically erasable read-and-write liquid crystal/side-chain liquid crystalline polymer composition, and method of making recordation on the same, are disclosed. The liquid crystal/side-chain liquid crystalline polymer composition of the present invention comprises: (1) from 45% to 85% of a nematic type ester-based liquid crystal and (2) from 15% to 55% of side-chain polymethylsiloxane liquid crystalline polymer having a molecular weight between about 4,000 to 10,000. The side-chain polymethylsiloxane polymer is prepared by graft-polymerization of a biphenyl derivative having a terminal saturated or unsaturated alkyl group, which can be either symmetrical or asymmetrical, with a polymethylsiloxane to form the liquid crystal side-chain polymethylsiloxane polymer of the present invention. Data are recordable on the recording medium of the present invention using a laser beam heating, and are erasable by applying an external electrical field.

REFERENCES:
patent: 4904066 (1990-02-01), Gray et al.
Makromol. Chem., Rapid Commun. 1, 31-34 (1980) "Investigations of Liquid Crystalline Polysiloxanes, 1. Synthesis and Characterization of Linear Polymers".
CA:118: 112826.

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