Diamino compounds and liquid crystal aligning films

Details Diamino compounds and liquid crystal aligning films Diamino compounds and liquid crystal aligning films

1989-06-27

1992-01-28

Welsh, Maurice J.

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528170, 528172, 528176, 528183, 528185, 528187, 528188, 528220, 528229, 528350, 428 1, 4284735, 25217424, 359 75, C08G 6926, C09K 1900

Patent

active

050845578

ABSTRACT:
The present invention provides diamino compounds and liquid crystal aligning films comprising polyimides which are obtained from the said diamino compounds represented by the general formula: ##STR1## wherein R.sub.1 indicates an alkyl group having 3 to 22 carbon atoms, R.sub.2 indicates a hydrogen atom or an alkyl group having 1 to 22 carbon atoms, and R.sub.3 -R.sub.10 indicate a hydrogen atom or a methyl group, respectively.
The liquid crystal aligning films are useful for STN mode display cells in realizing a high pretilt angle.

REFERENCES:
patent: 4316844 (1982-02-01), Waitkus et al.
patent: 4696994 (1987-09-01), Nakajima et al.
patent: 4847349 (1989-07-01), Ohta et al.

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