Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1997-11-07
1999-01-05
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528170, 528171, 528172, 528173, 528174, 528179, 528185, 528188, 528220, 528229, 528350, 428 1, 349 1, 349 56, 349123, 349135, C08G 7310, G02F 113, G02F 11337
Patent
active
058564314
ABSTRACT:
A process for inducing pre-tilt in alignment of a liquid crystal medium comprising exposing at least one optical alignment layer, comprising anisotropically absorbing molecules and hydrophobic moieties, 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 the 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 induce a pre-tilt at an angle .PHI. with respect to the surface of the optical alignment layer and applying a liquid crystal medium to said optical alignment layer, is described. The invention also is directed to liquid crystal display elements made by the process of the invention and to novel polyimide compositions that are useful as optical alignment layers in the invention.
REFERENCES:
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patent: 5032009 (1991-07-01), Gibbons et al.
Shigeki Ishibashi, Misako Hirayama, Tohru Matsuura, Polyimide with Fluorinated Side Chains for Liquid Crystal Alignment, Mol. Cryst. Liq. Cryst., 1993, vol. 225, pp. 99-105.
H. Fukuro, S. Kobayashi, Newly Synthesized Polyimide for Aligning Nematic Liquid Crystals Accompanying High Pretilt Angles, Mol. Cryst. Liq. Cryst., 1988, vol. 163, pp. 157-162.
Michinori Nishikawa, Yasuaki Yokoyama, Nobuo Bessho, Dae-Shik Seo, Yasufumi Iimura, Shunsuke Kobayashi, Synthesis of a Novel Organic-Solvent-Soluble Polyimide and Its Application to Alignment Film for Liquid Crystal Displays, Jpn. J. Appl. Phys., 1994, vol. 33, pp. L810-L812.
A. Dyadyusha, A. Khizhnyak, T. Marusii, Yu. Reznikov, O. Yaroshchuk, An Oblique Orientation of Nematic Liquid Crystals on a Photosensitive Aligning Polymer, Mol. Cryst. Liq. Cryst., 1995, vol. 263, pp. 399-413.
Gibbons Wayne M.
Shannon Paul J.
Sun Shao-Tang
Alliant Techsystems Inc.
Hampton-Hightower P.
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