Process for controlling layer spacing in mixtures of smectic...

C - Chemistry – Metallurgy – 09 – K

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C09K 19/02 (2006.01) C09K 19/34 (2006.01) G02F 1/13 (2006.01) G02F 1/141 (2006.01)

Patent

CA 2185797

A process for controlling layer spacing in mixtures of smectic liquid crystal compounds comprises the step of combining a liquid crystal composition having a net negative thermal layer expansion in at least one tilted (or latent tilted) smectic mesophase and a liquid crystal composition having a net positive thermal layer expansion in at least one tilted (or latent tilted) smectic mesophase each of the compositions comprising at least one smectic or latent smectic liquid crystal compound. The process enables control of layer spacing in the tilted smectic mesophase(s) and thereby control or suppression of chevron layer geometry.

Un procédé permettant d'ajuster l'espacement des couches dans des mélanges de cristaux liquides smectiques consiste à combiner une composition de cristaux liquides présentant une dilatation thermique nette négative de la couche au moins dans une mésophase smectique inclinée (ou potentiellement inclinée) et une composition de cristaux liquides présentant une dilatation thermique nette positive de la couche dans au moins une mésophase smectique inclinée (ou potentiellement inclinée), chacune des compositions comprenant au moins un composé formant des cristaux liquides smectiques ou potentiellement smectiques. Le procédé permet d'ajuster l'espacement des couches dans la ou les mésophases smectiques inclinées et de réduire ou de supprimer ainsi la formation de structures en chevrons.

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