Nippon Kayaku Kabushiki Kaisha

Polatechno Co., Ltd.

Takahiro Higeta

Hiroaki Ohno

Yukihiro Hara

Takuto Nishiguchi

Yuichi Sadamitsu

Noriaki Mochizuki

Mitsunori Nakamura

Noriko Kiyoyanagi

Michiharu Arifuku

Shoko Saito

The purpose of the present invention is to provide: a high-performance polarizing plate which functions for light in an infrared wavelength range; and a liquid-crystal display device or the like comprising the same. Provided is a polarizing plate for an infrared range, which is a stretched film containing a dye exhibiting absorption in an infrared range, the film exhibiting dichroism.

Dye-based polarizing plate for infrared wavelength range using azo, anthraquinone, or cyanine compound

The present invention relates to an azo compound that is useful as a dichroic pigment used in a polarizing plate having excellent polarizing performance and durability and having little color leakage in a visible light region, and used in a neutral gray polarizing plate for vehicle mounting that uses the aforementioned polarizing plate. More specifically, the invention relates to an azo compound that is represented by formula (1) [In the formula, R-Reach independently represent a hydrogen atom, a C1-5 alkyl group, a C1-5 alkoxy group, a sulfo group, or a C1-5 alkoxy group having a sulfo group, X represents an amino group having a substituent, a benzoylamino group having a substituent, a phenylamino group having a substituent, a phenylazo group having a substituent, or a naphthotriazole group having a substituent, m represents 3 or 4, n represents 1 or 2, and p represents 1, 2, or 3.], or to a salt of said compound.

Azo compound, dye-based polarizing film containing same, and polarizing plate

A polarizer contains, in a base thereof, at least one of an azo compound represented by Formula (1) or a salt thereof (as compound A), and at least one of an azo compound represented by Formula (2-I), (2-II), (3), (4-I), (4-II), (5-I) or (5-II), or a salt thereof (as compound B).

Dye-based polarizer as well as polarizing plate and liquid crystal display device using the polarizer

Azo compounds represented by formula (1) or (2) (In the formulas, A represents a phenyl group or naphthyl group that has at least 1 substituent. R-Rrepresent a hydrogen atom, lower alkyl group or lower alkoxy group, with at least one of R-Rbeing a lower alkoxy group that has a sulfone group. X represents an optionally substituted amino group, optionally substituted benzoylamino group, optionally substituted phenylamino group, optionally substituted phenyl azo group or optionally substituted naphthotriazole group) and salts thereof. 

Azo compounds, and dye-based polarizing films and polarizing plates comprising the same

The present invention relates to an azo compound represented by the following formula (1) [wherein, A represents a naphthyl group having a substituent, Rto Reach independently represent a hydrogen atom, an alkyl group having a carbon atom number of 1 to 5, an alkoxy group having a carbon atom number of 1 to 5, a sulfo group, or an alkoxy group having a sulfo group and a carbon atom number of 1 to 5, and X represents a benzoylamino group having a substituent, a phenylamino group having a substituent, a phenylazo group having a substituent, or a naphthotriazole group having a substituent] and a salt thereof. By using the azo compound or a salt thereof of the present invention, a neutral color polarizing plate and a color polarizing plate for a liquid crystal projector being excellent in polarization performance and durability. 

Azo compound and salt thereof, and dye-based polarizing film and polarizing plate containing the same

The present invention relates to an azo compound represented by the following formula (1), [wherein, A represents a phenyl group which may have a substituent, Rto Reach independently represent a hydrogen atom, an alkyl group having a carbon atom number of 1 to 5, an alkoxy group having a carbon atom number of 1 to 5, a sulfo group, or an alkoxy group having a sulfo group and a carbon atom number of 1 to 5, and X represents an amino group which may have a substituent, a benzoylamino group which may have a substituent, a phenylamino group which may have a substituent, a phenylazo group which may have a substituent, or a naphthotriazole group which may have a substituent] or/and a salt thereof and to a polarizing film and a polarizing plate which contain it. 

Azo compound, dye-based polarizing film and polarizing plate

The present invention relates to an azo compound represented by the following formula (1) [wherein, A represents a naphthyl group having a substituent, Rto Reach independently represent a hydrogen atom, an alkyl group having a carbon atom number of 1 to 5, an alkoxy group having a carbon atom number of 1 to 5, a sulfo group, or an alkoxy group having a sulfo group and a carbon atom number of 1 to 5, and X represents a benzoylamino group having a substituent, a phenylamine group having a substituent, a phenylazo group having a substituent, or a naphthotriazole group having a substituent] and a salt thereof. A neutral color polarizing plate and a color polarizing plate for a liquid crystal projector being excellent in polarization performance and durability and having less color leakage in a visible light region can be provided. 

Disclosed is an azo compound represented by the formula (1) below, a salt thereof, or a copper complex salt compound thereof. (In the formula, R1 and R2 independently represent a hydrogen atom, a sulfonic acid group, a lower alkyl group or a lower alkoxyl group; R3-R6 independently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group; R7 represents a lower alkyl group or a lower alkoxyl group; and n represents 0 or 1.)

Azo compound and dye polarizing film containing the same

Azo compounds represented by formula (1) (In the formula, Rrepresents a lower alkoxy group with a sulfone group. R-Reach independently represents a hydrogen atom, lower alkyl group or lower alkoxy group. X is an optionally substituted amino group, optionally substituted benzoylamino group, optionally substituted phenylamino group, optionally substituted phenyl azo group or optionally substituted naphthotriazole group. m represents 1 or 2 and n represents 0 or 1.) and salts thereof. 

Azo compound and salts thereof, as well as dye-based polarization films and polarizing plates comprising the same

Disclosed is an azo compound represented by the formula (1) or (2) below, or a salt thereof. (In the formulae, A represents a substituted phenyl group or a naphthyl group having 1-3 sulfonic acid groups; X represents &#x2014;N&#x2550;N&#x2014; or &#x2014;NHCO&#x2014;; R-Rindependently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group; m represents a number of 1-3; and n represents 0 or 1).

Disclosed is an azo compound represented by the formula (1) or (2) below, or a salt thereof. (In the formulae, A represents a substituted phenyl group or a naphthyl group having 1-3 sulfonic acid groups; X represents &#x2014;N&#x2550;N&#x2014; or &#x2014;NHCO&#x2014;; R-Rindependently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group; m represents a number of 1-3; and n represents 0 or 1.)

Disclosed is an azo compound represented by the formula (1) or (2) or a salt thereof. The azo compound or the salt thereof has an excellent light-polarizing property, and is extremely useful as a dichroic dye for use in a polarizing plate that shows less color leakage in a visible light range or a polarizing plate for a liquid crystal projector comprising the aforementioned polarizing plate. (1) (2) wherein Rrepresents a hydrogen atom, a lower alkyl group, a lower alkoxy group, a hydroxyl group, a sulfonate group or a carboxyl group; Rto Rindependently represent a hydrogen atom, a lower alkyl group, a lower alkoxy group or an acetylamino group; X represents a benzoylamino group which may have a substituent, a phenylamino group which may have a substituent, a phenylazo group which may have a substituent, or a naphthotriazole group which may have a substituent; m represents a numeral number of 1 or 2; and n represents a numeral number of 0 or 1. 

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Tokyo, Japan

Takahiro Higeta