Disazo compound or salt thereof and polarizing film using...

Details Disazo compound or salt thereof and polarizing film using... Disazo compound or salt thereof and polarizing film using...

2006-07-04

2006-07-04

Gulakowski, Randy (Department: 1712)

Compositions

Light transmission modifying compositions

Producing polarized light

C359S483010, C359S490020, C359S491010, C534S827000

Reexamination Certificate

active

07070715

ABSTRACT:
The present invention provides a disazo compound of the formula (I) or a salt thereofwherein A represents 4-sulfophenyl or 6,8-disulfo-2-naphtyl, one of R1and R2represents hydrogen or methyl.The present invention also provides a dye-based polarizing film comprising a base material and the disazo compound of the formula (I) or the salt thereof contained in the base material.The disazo compound of the present invention provides a polarizing film, which is excellent in light resistance and initial polarizing performance, particularly light resistance when used as a polarizing element.

REFERENCES:
patent: 5318856 (1994-06-01), Misawa et al.
patent: 6552849 (2003-04-01), Furuhashi et al.
patent: 1-172907 (1989-07-01), None
patent: 1-252904 (1989-10-01), None
patent: 9-302249 (1997-11-01), None
patent: 2001-235629 (2001-08-01), None
patent: 2002-357720 (2002-12-01), None
patent: WO 00/37973 (2000-06-01), None

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