Polymers for use as alignment layers in liquid crystal devices

Details Polymers for use as alignment layers in liquid crystal devices Polymers for use as alignment layers in liquid crystal devices

2004-03-04

2009-08-18

Visconti, Geraldina (Department: 1795)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

Alignment layer of specified composition

C428S001100, C428S001300, C252S299010, C252S299600, C430S020000, C430S270100, C525S056000

Reexamination Certificate

active

07575788

ABSTRACT:
The invention relates to a polymer for use as a surface-director alignment layer in a liquid crystal device, the polymer comprising a polymeric backbone and side-chains attached thereto, wherein the polymeric backbone lacks directly coupled ring structures, and each side-chain of at least some of the side-chains comprises at least two unsubstituted and/or substituted phenyls coupled via a coupling selected from the group consisting of a carbon-carbon single bond (—), a carbon-carbon double bond containing unit (—CH═CH—), a carbon-carbon triple bond containing unit (—C≡C—), a methylene ether unit (—CH2O—), an ethylene ether unit (—CH2CH2O—), an ester unit (—COO—) and an azo unit (—N═N—), exhibits a permanent and/or induced dipole moment that in ordered phase provides dielectric anisotropy, and is attached to the polymeric backbone via at least two spacing atoms.

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