Method for liquid crystal alignment

Details Method for liquid crystal alignment Method for liquid crystal alignment

1998-09-04

2000-05-16

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

522162, 522134, 428 1, 528350, 528353, 349124, 349134, 349136, C08J 328, C09K 1900, C08G 6926, G02F 11337, G02F 1141

Patent

active

06063829&

ABSTRACT:
A treating method for liquid crystal alignment, which comprises applying polarized ultraviolet or electron rays to a polymer thin film formed on a substrate, in a predetermined direction relative to the substrate surface, and using the substrate to align liquid crystal without rubbing treatment, wherein the polymer thin film is a polyimide resin containing a repeating unit of the formula (I): ##STR1## (wherein R.sup.1 is a tetravalent organic group having an alicyclic structure, and R.sup.2 is a bivalent organic group), which is obtained by dehydration ring-closure of a polyimide precursor having a reduced viscosity of from 0.05 to 3.0 dl/g (in N-methyl-2-pyrrolidone at temperature of 300.degree. C. at a concentration of 0.5 g/dl)

REFERENCES:
patent: 5061509 (1991-10-01), Naito et al.
patent: 5700860 (1997-12-01), Nishikawa et al.
patent: 5764326 (1998-06-01), Hasegawa et al.

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