| 摘要 |
1536210 Continuous solvent dyeing and optical brightening of synthetic fibres CIBAGEIGY AG 12 March 1976 [14 March 1975 3 April 1975] 10043/76 Headings D1B and DIP Synthetic fibres are continuously dyed or optically brightened from organic solvents by preheating the material to at least 100‹C, impregnating with a halogenated hydrocarbon liquor containing a dyestuff or optical brightener to give a liquor absorption of more than 100% by weight, followed by a passage through a vapour zone filled with a halogenated hydrocarbon at a temperature above the boiling point of the halogenated hydrocarbon so that some of the solvent evaporates while more than 5% by weight of liquor is present on the material when it emerges from the vapour zone, the material not being dry at any stage. Substrates treated include linear high molecular polyamides, cellulose 2¢ acetate, cellulose triacetate, and polyester. Disperse dyes and disperse optical brighteners are used in trichloroethylene, 111-trichloroethane and tetrachloroethylene as halogenated hydrocarbon.
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