67results about "Polyazo dyes" patented technology

An anisotropic dye film having high dichromatic properties is provided. An anisotropic dye film wherein the period d attributable to molecular stacking is at most 3.445 AA, and the column length L thereof is at least 105 AA. The anisotropic dye film preferably has a degree of orientation of the molecular stacking axes of at least 85% and a film thickness of at most 30 m, and is formed by a wet film-forming method. Since it has a molecular alignment suitable to develop a dichroic ratio, it provides high dichromatic properties. A polarizing element having this anisotropic dye film is excellent in heat resistance, light fastness and polarizing performance.

A polarizing film, satisfying DI′/P′≦4.3×10⁻⁴ which expresses relation between degree of polarization P′, and depolarization index DI′ calculated by the equation below is disclosed. X represents a value calculated by the equation below, provided that a polarizing plate having degree of polarization of P, the polarizing film, and a polarizing plate having degree of polarization P, having azimuths of transmission axes of a°, b° and c°, respectively, are stacked in this order as viewed from a light source, to give brightness written as [a/b/c].

The present invention relates to a water-based black ink composition comprising a water-soluble black dye (A) exhibiting ozone fastness and a condensate compound (B) of 4,4′-dinitrostilbene-2,2′-disulfonic acid and aminobenzenes or a reduction product (C) thereof. Said ink composition is suitable for use in ink-jet recording, and realizes neutral hue and black color of high printing density. Further, a printed matter obtained is excellent in ozone gas fastness, light fastness, moisture fastness and color rendering properties. Still further, storage stability as a recording liquid is excellent.

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 R₁ represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, a hydroxyl group, a sulfonate group or a carboxyl group; R₂ to R₅ independently 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.

[Problems] A compound of a black ink which has such excellent fastnesses of a recorded article as light fastness, ozone gas fastness and moisture fastness, excellent solubility, and storage stability as a recording liquid, when used for inkjet recording and writing tools, and an ink composition comprising the same are provided.

[Method for solving the problems] An azo compound represented by the following Formula (1) or a salt thereof, and an ink composition comprising the same

(wherein, each of R¹, R², R⁵, R⁶ and R⁷ independently represents a hydrogen atom, a carboxyl group, a sulfo group and the like, each of R³ and R⁴ independently represents a hydrogen atom, a sulfo group, a nitro group, a (C1 to C4) alkyl group (which may be substituted by a hydroxyl group or a (C1 to C4) alkoxy group), a (C1 to C4) alkoxy group (which may be substituted by a hydroxyl group, a (C1 to C4) alkoxy group, a sulfo group or a carboxyl group) and the like, and n represents 0 or 1, respectively).

The present invention relates to an azo compound represented by the following formula (1) [wherein, A represents a naphthyl group having a substituent, R₁ to R₆ each 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. 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 and having less color leakage in a visible light region can be provided.

The invention relates to a pollution-free production technology of direct fast black G, comprising the following implementation steps: firstly, primary acid coupling is carried out on nitroaniline after diazotization and H-acid; after the full reaction of the H-acid is detected, sodium carbonate is added and pH is adjusted to 8 to 8.2 to carry out secondary basic coupling; the coupling product is added into a sodium sulfide solution for reduction, and the temperature gradually raises to t of 38 DEG C to 40 DEG C in the reaction process; after the sodium carbonate is added into the reduction product after acidification to adjust the pH of a medium to 7.5 to 8, the mixture is adsorbed by activated carbon and filtered, and ternary coupling is carried out on the obtained filter liquor after diazotization and lentine; and after the reaction is detected to be end point, the materials are directly delivered to a drying tower for spray drying. In the invention, the reduced reaction solution does not need the processes of salting out, acidification and filtration, activated carbon adsorption is adopted instead. In the process, no waste liquor is generated, and environment pollution caused in the production process of dye is greatly reduced. Simultaneously, wastewater processing is not needed, and the cost is saved. The optimized technology directly transfers the reaction solution after ternary coupling into the drying tower for spray drying; and the yield and the coloring intensity of the dye are effectively increased, energy is saved, the consumption is reduced, and the effect is obvious.

An ink composition includes: water, a compound represented by the following general formula (1) or a salt thereof, and a compound represented by the following general formula (21) or a salt thereof.

Group A represents a substituted heterocyclic group represented by the following general formula (2) or (3):

The present invention relates to an azo compound represented by the following formula (1):

(wherein, in the formula (1), R₁ represents a hydrogen atom; a hydroxyl group; a carboxyl group; a (C₁-C₄)alkyl group which may be substituted by a hydroxyl group or a (C₁-C₄)alkoxy group; or the like, and A represents an aliphatic amine residue having a carboxyl group or a sulfo group, respectively;) or a salt thereof; an ink composition containing the same; and an inkjet recording method and a colored object using the same. Said azo compound has a high color value and has a hue between yellow and red or a brown hue. The ink containing said azo compound has satisfactory storage stability, and exhibits, when printed therewith, a stable ejection property even on a thermal type inkjet printer, and gives a print of high quality (superior in light fastness, ozone gas fastness and moisture fastness).

An aqueous black ink composition that produces a black recorded image that is stable even when stored for a long time period, exhibits a neutral black to gray color with low color saturation and no tinge, has a high printed image density and exhibits excellent fastness properties of the recorded image, particularly ozone-gas resistance. The ink composition contain at least one kind of coloring matter (I), which a coloring matter represented by formula (1) below, a tautomer thereof, or a salt of the coloring matter or the tautomer; at least one kind of coloring matter (II), which is a coloring matter represented by formula (2) below or a salt thereof; and coloring matter (III), which is a coloring matter having an azo group other than coloring matters (I) and (II), or a salt thereof.

A coloring matter which exhibits excellent (ozone) gas resistance, high print density, low color rendering properties, low color saturation, and high-quality black hue when is recorded on a paper only for inkjet exclusive use, i.e., an azo compound represented by formula (1), a tautomer of the azo compound, or a salt of the azo compound or the tautomer; and an ink composition containing the coloring matter, particularly a black ink composition for inkjet recording applications.