| 摘要 |
The invention comprises vat dyestuffs that contain at least one substituent imparting solubility in water, at least one aryl residue bound through an oxygen atom and two anthraquinone residues (including anthrone residues having four or more fused rings) which are joined together by an -NH-X-NH- bridge in which X is the residue of an organic di- or tri-basic acid. Examples include sulphonated bis-(aryloxyanthraquinonylamino)triazines and sulphonated bis - (anthraquinonylamino) derivatives of dicarboxylic acids such as oxalic, succinic, terephthalic, diphenyl-4: 41-dicarbo-oxylic and thiophene 2: 5-dicarboxylic acids. The dyes are made by sulphonation of an appropriate vat dye, by reacting a phenol or naphthol with a suitable halo- or nitro-vat dye or by acylating an aryloxyaminoanthraquinone with a di- or tribasic carboxylic acid and, if necessary, sulphonating the product, or by sulphating or acylating with an acylating agent containing a water-solubilizing group an appropriate vat dye containing a hydroxy group. The dyes dye cellulose ethers and esters, polyamides, polyacrylonitrile and polyurethane fibres, wool and silk but particularly cotton by the vat-dyeing process.
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