Nitto-denko Corporation

Kyoko Nishiguchi

Shoichi Matsuda

Tadayuki Kameyama

Junzo Miyazaki

To obtain a water-resistant polarizing film free from deterioration in dichroic ratio caused by water-resistant treatment, it is critical that adjacent sulfonic acid groups or sulfonate groups in the organic dyes to be used for the polarizing film are spaced at moderate intervals. In a process for producing a water-resistant polarizing film of the present invention, the polarizing film before water-resistant treatment includes an organic dye which comprises an azo compoundrepresented by the following general formula (2) 

Process for producing water-resistant polarizing film

A liquid crystalline coating solution which comprises: an azo compound represented by the following general formula (1); and a solvent to dissolve the azo compound: wherein Qis an aryl group which may have any substituent group; Qis an arylene group which may have any substituent group; R is a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, an acetyl group, a benzoyl group, or a phenyl group (these groups may have any substituent groups); and M is a counter ion.

Liquid crystal coating solution, and polarizing film

To obtain a water-resistant polarizing film free from deterioration in dichroic ratio caused by water-resistant treatment, it is critical that adjacent sulfonic acid groups or sulfonate groups in the organic dyes to be used for the polarizing film are spaced at moderate intervals. In a process for producing a water-resistant polarizing film of the present invention, the polarizing film before water-resistant treatment includes an organic dye which comprises an azo compound 20 represented by the following general formula (1) or (2) 

There is provided a polarizing film exhibiting a stable and high dichroic ratio by forming a film using a water solution in which a metal capture agent has been added, even if multivalent metal cations are included.

Polarizing film and method for producing the same

A liquid crystalline coating solution which comprises: an azo compound represented by the following general formula (I); and a solvent to dissolve the azo compound: wherein Qis a substituted or unsubstituted phenyl group or a substituted or unsubstituted naphthyl group; Qis a substituted or unsubstituted phenylene group or a substituted or unsubstituted naphthylene group; m is an integer from 1 to 5; and M is a counter ion.

Liquid crystalline coating solution and polarizing film

The lyotropic liquid crystalline mixture of the present invention comprises at least a first azo compound and a second azo compound in relation of constitutional isomers wherein the first azo compound and the second azo compound are the constitutional isomers different in a binding site of at least an azo group. The first azo compound is preferably an azo compound wherein the azo group is bonded to an ortho-position of a hydroxyl group of an aminonaphthol skeleton. The second azo compound is preferably an azo compound wherein the azo group is bonded to an ortho-position of an amino group of an aminonaphthol skeleton. The lyotropic liquid crystalline mixture of the present invention may be utilized as a forming material of an optical anisotropic film, for example.

Lyotropic liquid crystalline mixture, coating liquid, and optical anisotropic film

A polarizer of the present invention comprises an azo compound which is represented by the following general formula (I). In the general formula (I), Qrepresents an optionally substituted aryl group, Qrepresents an optionally substituted arylene group, M represents a counter ion, l represents an integer of from 1 to 6, and m represents an integer of from 0 to 5 (l+m&#x2266;6). 

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Ibaraki, Japan

Kyoko Nishiguchi