49results about "Tetrazo dyes" patented technology

It is an object of the present invention to provide a black ink for an ink jet which possesses preferable color as a black ink for an ink jet, can attain high ozone resistance, high image density and sticking recovery property, and can suppress the decomposition of the compound represented by the general formula (I) or salt thereof during long-term storage. According to the present invention, there is provided a black ink for an ink jet characterized by comprising at least a compound represented by the following general formula (I) or a salt thereof, characterized in that the black ink comprises at least one moisture-retaining nitrogen compound, and the pH of the ink and the pH of the ink after storing for 10 days in an environment at a temperature of 60° C. are 9.5 or less.

A black ink composition comprising a colorant represented by Formula 1 below same as claim 1 and a colorant represented by Formula 2 below same as claim 1.A1-N═N-A2-N═N-A3  FORMULA 2

The present invention relates to a trisazo compound represented by the following formula (1) or a salt thereof, The formula (1)wherein, the group A is a substituted phenyl group, the group B and the group C are substituted para-phenylene groups, R1 represents a C1 to C4 alkyl group which may be substituted by a carboxy group, a phenyl group which may be substituted by a sulfo group, or a carboxy group, R2 represents a cyano group, a carbamoyl group or a carboxy group, each of R3 and R4 independently represents a hydrogen atom, a methyl group, a chlorine atom or a sulfo group, respectively and a water-based black ink composition containing said compound; said compound has high solubility in a medium where the main component is water, its aqueous solution having a high concentration and ink are stable when stored for a long period of time, black-recorded images with it can be provided where both light fastness and ozone gas fastness of the printed images are excellent.

A black ink composition comprising a colorant represented by Formula 1 below same as claim 1 and a colorant represented by Formula 2 below same as claim 1. A1-N═N-A2-N═N-A3  FORMULA 2

The present invention provides an inkjet recording ink comprising a dye represented by formula (1) below having a weight-average molecular weight of 850 or less, a water-soluble organic solvent represented by general formula (2) or (3) having an SP value of 9.4 or higher and less than 9.75, and water, the content of a surfactant being less than 0.1 mass%. R1, R2: H, halogen atom, OH, COOH, C1-C6 alkyl group, C1-C6 alkoxy group, NO2, azophenyl group; -L1-Ra and the like, L1: O, CH2, C6H4, N=N, SO2 or a combination thereof;Ra:phenyl group, naphthyl group; R3: H, azophenyl group, azonaphtalene group; -L2-Rb and the like, L2: C(=O), C6H4, N=N, NH, SO2 or a combination thereof; Rb: phenyl group, naphthyl group, pyrimidyl group, or the like; M: H, Na, NH4, alkyl ammonium or the like; R: C2-C6 unsubstituted alkyl group; n = 1 to 3.

An azo compound represented by the following formula (1): (wherein R<1> and R<2> each independently represents hydrogen, halogeno, cyano, carboxy, sulfo, sulfamoyl, N-alkylaminosulfonyl, N-phenylaminosulfonyl, etc.; R<3>, R<4>, R<5>, R<6>, R<7>, and R<8> each independently represents hydrogen, halogeno, hydroxy, cyano, carboxy, sulfo, sulfamoyl, N-alkylaminosulfonyl, N-phenylaminosulfonyl, etc.; and n is 0 or 1) or a salt of the compound. Also provided are an ink composition containing the compound or salt, recording method and colored object. The ink composition containing the azo compound has excellent long-term storage stability and gives a print excellent in light resistance and ozone resistance.