Azo compound or salt thereof, and polarizing film containing same
An azo compound and polarizing film technology, applied in the direction of azo dyes, polarizing elements, monoazo dyes, etc., can solve the problem of inability to adjust the color tone
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Embodiment 1
[0383] 25.3 parts of 4-aminobenzene-1,3-disulfonic acid (denoted as Ag 1 -NH 2 ) to 200 parts of water and 40 parts of 35% hydrochloric acid. Next, 17.3 parts of 40% sodium nitrite aqueous solution was added and stirred, and diazotization was performed at 10-20 degreeC. Add 1-aminonaphthalene-7-sulfonic acid (referred to as Bg-NH) dissolved in 15% sodium carbonate aqueous solution to it 2 ) 22.3 parts, add 15% sodium carbonate aqueous solution to the solution to adjust the pH to 2, and then stir to complete the coupling reaction. Then, salting out was performed with sodium chloride, followed by filtration to obtain 39.0 parts of a monoazoamino compound represented by the formula (A2').
[0384]
[0385] 39.0 parts of the monoazoamino compound (A2') obtained above was added to 400 parts of water, and it was dissolved with 25% sodium hydroxide. After adding 13.8 parts of 40% sodium nitrite aqueous solution, 32.0 parts of 35% hydrochloric acid were added at 10-30 degreeC...
Embodiment 2
[0389] Use 18.7 parts by weight of 2-amino-4-methoxybenzenesulfonic acid as Ag 1 -NH 2 Carry out the 1st process, and use 16.2 parts of 1-amino-2-methoxynaphthalene-6-sulfonic acid (represented as Cg-NH 2 ) except that the 2nd process was performed, it operated similarly to Example 1, and obtained 46.1 parts of bis-azoamino compounds represented by formula (A10").
[0390]
[0391] Add 46.1 parts of the bis-azoamino compound (A10") obtained above to 400 parts of water, and dissolve it with 25% sodium hydroxide. Add 11.0 parts of 40% sodium nitrite aqueous solution, and then heat it at 20°C to 30°C. Add 25.6 parts of 35% hydrochloric acid at ℃, and stir at 20℃~30℃ for 1 hour to carry out diazotization. On the other hand, 16.1 parts of 6-phenylamino-1-naphthol-3-sulfonic acid (denoted as The compound of formula (vi)) is added to 100 parts of water, utilizes 25% sodium hydroxide aqueous solution to be adjusted to be slightly alkaline and make it dissolve.Keep the pH as 8~10...
Embodiment 3
[0393] Use 17.3 parts of 4-aminobenzenesulfonic acid as Ag 1 -NH 2 , except that, it carried out similarly to Example 2, and obtained 51.1 parts of trisazo compounds represented by formula (1-A11). The maximum absorption wavelength in an aqueous solution of this compound is 630 nm.
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