Patent GB-384545-A (GB)
Title: Improvements in or relating to the colouration of filaments, yarns, threads, and the
IPC: D06P1/00
Filed: 1932-05-06
Abstract: Cellulose esters, dyeing; printing; mordant dyes, dyeing with; azo dyes, forming upon the material.--Filaments, yarns, threads, and the like made of or containing cellulose organic esters are treated by applying at intervals along their lengths, while they are travelling, an agent capable of saponifying the esters in admixture with either (1) a substance capable of colouring the saponified esters, or (2) a mordant, or (3) a substance adapted to be developed to form a colour on the material.  The filaments &c. may be treated continuously with their production.  Specified dyestuffs for the saponified material are direct cotton colours such as Chlorazol sky blue FF, Chlorantine fast blue 2GL, Chlorazol fast red K, and Pontamine fast red F, and vat dyestuffs in the form of their leuco compounds or esters thereof. The saponifying compositions containing direct cotton colours may contain also dispersing and/or wetting agents, e.g. ethanolamines such as triethanolamine, sulphonated aromatic compounds, and polyhydric alcohols such as ethylene glycol or diethylene glycol. Specified substances adapted to be developed to form a colour are b -naphthol and oxynaphthoic acid arylides for subsequent development with diazo compounds.  The treated filaments &c. may be steamed at 60-80 DEG  C. to complete the action of the saponifying agent and/or to effect the fixation in the material of the colouring matters, mordants or components.  The filaments &c. may be additionally treated at intervals with effect compositions as described in Specifications 314,396, [Class 15 (ii), Dyeing, Processes &c. for], and 360,896, or with mechanical reserves as described in Specification 332,290, [Class 15 (ii), Dyeing, Processes &c. for], or with dyestuffs having affinity for cellulose esters as described in Specification 332,565, [Class 15 (ii), Dyeing, Processes &c. for]. The treatment may also be applied in conjunction with one for the production of cr<\>zepe effects, e.g. as described in Specification 362,523.  Fabrics showing various effects in dyeing are obtainable by knitting or weaving the treated yarns into fabrics with or without other types of yarn.  The following examples are specified: (1) An aqueous composition containing caustic soda and Chlorazol sky blue FF is applied in streaks of \ba5/8\be in. width and \ba5/8\be in. apart to a yarn of acetone-soluble cellulose acetate travelling from a tensioning device to a hollow perforated winding bobbin and the yarn on the bobbin is steamed at 70 DEG  C. for \ba1/2\be hr. and washed by forcing water through the perforations; the colour is fast to light and to scouring.  (2) The dyestuff in (1) is replaced by Pontamine fast red F together with triethanolamine to assist dispersion and the steaming is effected at 70 DEG  C. for \ba1/2\be-2 hrs.  (3) The dyestuff in (1) is replaced by Indanthrene golden yellow GK reduced with sodium hydrosulphite and the treated yarn is further treated with a soap solution p  containing sodium perborate. (4) The yarn is treated at intervals with three separate alkaline compositions, viz. (a) one containing Ciba scarlet reduced with sodium hydrosulphite, (b) one containing Indanthrene printing black B paste, and (c) one containing Indanthrene golden yellow GK reduced with sodium hydrosulphite, and is further treated at 60 DEG  C. for \ba1/2\be hr. with a soap solution containing sodium perborate.  The subject-matter claimed in Specification 351,417 is disclaimed.  The Specification as open to inspection under Sect. 91 comprises also the simultaneous saponification and dyeing of complete lengths of travelling yarns.  This subject-matter does not appear in the Specification as accepted.