Browse Prior Art Database

Liquid Crystal Mixtures

IP.com Disclosure Number: IPCOM000086528D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Barrall, EM: AUTHOR [+4]

Abstract

Mixtures have been found which meet the requirements for a satisfactory liquid crystal medium in a laser-addressed thermal display device.

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This is the abbreviated version, containing approximately 100% of the total text.

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Liquid Crystal Mixtures

Mixtures have been found which meet the requirements for a satisfactory liquid crystal medium in a laser-addressed thermal display device.

A mixture of 4-octyl-4'-cyanobiphenyl (C(8)) and 4-n-decyl-4'-cyanobiphenyl (C(10)) was prepared which is 70 mole % of C(8) and 30 mole % of C(10). It melts to a smectic phase at 10 Degrees C and remains smectic until 40 Degrees C when it becomes nematic. It remains nematic until 43 Degrees C, at which temperature it becomes isotropic.

The mixture is stable to moisture and light, can be heated and cooled many times without deterioration, gives very high contrast images, has indefinite storage once written, and can easily be erased either selectively or totally as the operator desires.

In some machine environments the ambient temperatures may be as high as 45-50 Degrees C. Under these conditions a mixture with a higher smectic-to- nematic transition temperature and a higher nematic-to-isotropic transition temperature is required. A new ternary mixture of liquid crystal compounds has been prepared which shows these improved properties. The composition of the mixture is 4-n-octyloxy-4'-cyanobiphenyl, 4-n-decyl-4'-cyanobiphenyl, and 4-n- undecyl-4'-cyanobiphenyl.

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