GB536686A - Improvements in or relating to the treatment of cellulosic textile materials - Google Patents

Abstract

536,686. Dyeing processes; artificial filaments &c. COURTAULDS, Ltd., TALLIS. E. E., and FIELD, W. J. C. Nov. 22, 1939, Nos. 30565/39, 3262/40 and 12065/40. [Classes 2 (ii), 2 (iii) and 15 (ii)] The affinity of cellulosic textile materials for dyestuffs commonly used for dyeing wool and like animal fibres, is improved by incorporating in the materials a compound obtained by the action of an aryl isocyanate or isothiocyanate on a polyalkylene polyamine. The materials may be impregnated with a solution or dispersion of the compound or in the case of artificial threads, the compound may be incorporated in the spinning solution from which the threads are formed. The polyalkylene polyamine which is caused to combine with the aryl isocyanate may be ethylene diamine, trimethylene diamine, triethylene tetramine, tetraethylene pentamine, pentaethylene hexamine, or other polyethylene polyamine, or a compound obtained from any of these substances by further alkylation, e.g. by condensation with an aliphatic alkylating agent containing more than one alkylating group such as α-dichlorhydrin, dichlorethylene, trimethylene bromide; dichlorisopropyl ether, triglycol dichloride, or sym-dichloracetone. or by condensation with an alkylene oxide such as ethylene oxide. The isocyanate or isothiocyanate reaction product may be treated before or after incorporation in the cellulosic material with a halogenating agent such as chlorine, or bromine, or a hypochlorite, or a hypobromite, as this tends to prevent the dye from wandering from the cellulose to other admixed textiles during prolonged dyeing treatment. The treatment with halogenating agent may be combined with a bleaching treatment. In an example, a solution of triethylene tetramine in water is mixed with alcohol and heated under reflux with α-dichlorhydrin to give an aqueous solution of a polyamine compound. The solution is diluted with water and an emulsifying agent and mixed in a pebble-mill with phenylisothiocyanate. The dispersion obtained is mixed with viscose which is then formed into artificial threads which have an enhanced affinity for wool dyes. The resulting threads may be desulphurized and then bleached with hypochlorite solution. In another example, tetraethylene pentamine is heated to 100‹C. and then ethylene oxide is mixed with it under reduced pressure. The compound obtained is dissolved in benzyl alcohol and then phenyl isothiocyanate is added slowly while cooling. The solution is dispersed in viscose which is then extruded into a solution of sulphuric acid containing sulphates and glucose. The threads obtained are de-sulphurized and bleached. Specification 536,687 is referred to.