| 摘要 |
Green or blueish-green shades are produced on cellulose ester or ether materials by the application to such materials of dihydroxydimercaptoanthraquinones in which the hydroxy and mercapto groups all occupy a -positions. Thus there may be employed products obtained either by alkaline hydrosulphite reduction of Solway Emerald (prepared by the action of sodium sulphide on 1,5-dihydroxy - 4,8 - dinitroanthraquinone - 2,6 - disulphonic acid admixed with some 1,8-dihydroxy-4,5 - dinitroanthraquinone - 2,7 - disulphonic acid according to the process of Specification 20359/05, [Class 2, Acids and salts, Organic &c.]), or by the interaction of alkaline polysulphide and a dihydroxydihalogenanthraquinone (the hydroxy and halogen substituents all being in a -positions); the reduction of Solway Emerald appears to result in the elimination of sulphonic acid groups, while the polysulphide treatment in the second process results in replacement of halogen atoms by mercapto residues. The products may be applied by dyeing from aqueous suspension or solution with or without the addition of dispersing or solubilizing agents, as for example soluble oil or sulphite cellulose liquor, and they may also be used in printing or other processes. In examples (1) Solway Emerald is treated in boiling aqueous solution with sodium hydrosulphite. A 10 per cent aqueous paste of the product, which appears to contain one sulphuric acid group, is dispersed with soluble oil and used for dyeing green shades on cellulose acetate: (2) the alkaline hydrosulphite treatment of (1) is repeated to give a product free from sulphonic acid groups and which dyes cellulose acetate more readily: (3) 1,4-dichloro-5,8-dihydroxyanthraquinone is treated in aqueous methylated spirit with sodium polysulphide; the product dyes blueish-green shades. The treatment with polysulphide of 1,5-dihydroxy-4,8-dichloro-(or dibromo)-anthraquinone and of the isomeric 1,8 : 4,5-compound and of 1,5-dihydroxy-2,4 : 6,8-tetrachloro-(or tetrabromo-)-anthraquinone to give similar products for the process is also referred to.
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