Process and materials for aligning liquid crystals and liquid cr

Details Process and materials for aligning liquid crystals and liquid cr Process and materials for aligning liquid crystals and liquid cr

1996-03-29

1998-09-15

Kelly, C. H.

Compositions

Liquid crystal compositions

Containing nonchiral aligning agents

25229901, 428 12, C09K 1956, C09K 1952, C09K 1900

Patent

active

058074988

ABSTRACT:
A process for aligning liquid crystals adjacent to a surface of an optical alignment layer comprising: exposing at least one optical alignment layer, comprising anisotropically absorbing molecules, to polarized light; the polarized light having a wavelength within the absorption band of said anisotropically absorbing molecules; wherein the exposed anisotropically absorbing molecules induce alignment of a liquid crystal medium at an angle +and-.theta. with respect to the direction of the polarization of the incident light beam and along the surface of the optical alignment layer; and applying a liquid crystal medium to said optical alignment layer; wherein said anisotropically absorbing molecules consist essentially of diaryl ketones, is described. The invention also is directed to a liquid crystal optical storage medium, a liquid crystal display element, and a liquid crystal diffractive optical element made by the process of the invention and to novel polyimide compositions that are useful as optical alignment layers in the process of the invention.

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