Dichroic azo dyestuff and the polarizing film making from...

Details Dichroic azo dyestuff and the polarizing film making from... Dichroic azo dyestuff and the polarizing film making from...

2007-10-16

2007-10-16

Powers, Fiona T (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Azoxy

C252S585000, C359S491010

Reexamination Certificate

active

11519062

ABSTRACT:
The present invention relates to a azo dyestuff compound of the following formula (I), of which the free acid is represented by the following formula:wherein R1, R2, R3, R4, and n are defined as in the specification. The azo dyestuff compound of formula (I) of the present invention is used for preparing polarizing film. The present invention also relates to a polarizing film comprising the azo dyestuff compound of formula (I), which has excellent degree of polarization.

REFERENCES:
patent: 2004250 (1935-06-01), Schindhelm et al.
patent: 4297278 (1981-10-01), Nickel
patent: 5423100 (1995-06-01), Misawa et al.

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