| 摘要 |
Azopyrazolium dyes of the formula: <IMAGE> in which R1 represents an alkyl group or a phenyl group which may be substituted with a halogen atom or with a nitro, alkoxy or alkyl group, R2 represents an alkyl group; R3 represents an atom of hydrogen or halogen; R4 represents the residue of a coupler R4H free of a sulfonic or carboxylic group; and X- represents a monovalent anion, and 3-trifluoromethyl-4-aryl-5-amino pyrazoles of the formula <IMAGE> in which R3 and R4 have the same meanings as above and R'1 represents a hydrogen atom, an alkyl group, or a phenyl group which may be substituted with a halogen atom or with a nitro, alkoxy or alkyl group, are disclosed; methods are disclosed for making these compounds and using them for the dyeing of fibers based on polymers and copolymers of acrylonitrile or on acid-modified polyesters or polyamides to pure and brilliant shades having good fastness, especially fastness to light, e.g., for using the pyrazoles to form the dyes.
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