Quinophthalone compounds and polarizing films using same

Details Quinophthalone compounds and polarizing films using same Quinophthalone compounds and polarizing films using same

1997-03-19

1998-05-12

Richter, Johann

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

Synthetic resins

Processes of preparing a desired or intentional composition...

546153, 546154, 524 90, C08K 534, C07D71520

Patent

active

057505993

ABSTRACT:
Novel quinophthalone compounds, which are represented by the following formula (1): ##STR1## R.sub.1 -R.sub.5 each independently represents a hydrogen or halogen atom or a hydroxy, linear or branched alkyl, substituted or unsubstituted cycloalkyl, halogenated alkyl, alkoxyalkyl, alkoxy, nitro, amino, alkylamino, carboxyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonylamino, alkylcarbonyloxy or cyano group; R.sub.6 -R.sub.17 each independently represents a hydrogen or halogen atom or a hydroxyl, alkyl, halogenated alkyl, alkoxy, nitro, amino, alkylamino, carboxyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonyloxy or cyano group; m and n each stands for 0 or 1; and A represents a substituent, are yellow orange dyestuffs suitable for polarizing films. Polarizing films containing at least one of the compounds in a hydrophobic resin are excellent in polarizing performance, heat-resistant dimensional stability, moist heat resistance and the like and are extremely useful for liquid crystal display devices.

REFERENCES:
patent: 3972885 (1976-08-01), Kimura
patent: 4324455 (1982-04-01), Imahori
patent: 4842781 (1989-06-01), Nishizawa
patent: 5059356 (1991-10-01), Nakamura
patent: 5650415 (1997-07-01), Tang
Chemical Abstracts, vol. 116, No. 10, Mar. 9, 1992.

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