Patent GB-550657-A (GB)
Title: Improvements in the production of coloured artificial fibres
IPC: D01F1/10
Filed: 1941-07-15
Abstract: 550,657. Artificial filaments, films, etc.; dyeing processes. STANLEY, E., ARGYLE, C. S., and OLPIN, H. C. July 15, 1941, No. 8932. [Classes 2 (ii) and 15 (ii)] - Coloured fibres of cellulose esters or ethers, polyvinyl compounds, or other fibre-forming materials are obtained by shaping into the required form and then setting a coloured solution of a cellulose ester or ether or other fibre-forming material, the solution being coloured by an arylamino-anthraquinone which is free from nuclear alkylamino and nuclear unsubstituted amino groups. Blue to green shades of good fastness to light and washing and to the action of combustion products of coalgas may be obtained on cellulose ester or ether fibres. The aryl radical of the arylaminoanthraquinone may be phenyl, o-, m-, or ptolyl, pbutyl phenyl, o-, m-, or pmethoxyphenyl, o-, m-, or p-ethoxy-phenyl, o-, m-, or p-(beta-hydroxy ethoxy) -phenyl, or p- (acetylamino) -phenyl. The compounds may contain one or more than one arylamino group and nuclear substituents may be present in addition to the arylamino groups e.g. hydroxy, groups. Sulphonic or carboxylic groups are preferably absent. The following are included: 1 - (p. phenyl -phenylamino) - anthraquinone (red), 1 : 8 - dihydroxy - 4 - (p - acetylamino phenyl amino) - anthraquinone (blue), 1 : 4-, 1 : 5-, and 1 : 8- di - (arylamino) anthraquinones, e.g. 1 : 4 - di - (0-methoxy phenylamino)- anthraquinone' (blue-green). Dyestuffs which have little or no affinity for the cellulose derivative, when they are applied as aqueous suspensions, are preferably used. The di - (arylamino) compounds are suitable in this respect and yield dyed products from which very. little colour bleeds on to. wool, cotton, or other textile material subjected to scouring in contact therewith. The 0-methoxy - phenylamino - compounds have such solubility in acetone that sufficient can readily be dissolved in cellulose acetate spinning solutions for the latter to yield on spinning. products coloured in full shades. The coloured solutions may be obtained by mixing the dye with the solvent for the fibre forming material. Where the dye is not sufficiently soluble to produce the required depth of shade by solution alone, the part which is not dissolved should be in very finely divided state. The dye may be kneaded or rolled together with fibre-forming material and sufficient solvent to form a dough, the mechanical treatment being continued with evaporation of solvent until the mass can be ground. After grinding, the product may be incorporated with the requisite solvent and such further quantity of fibre-forming material as may be necessary. Filaments containing 0.05 to 1.5 per cent. of the dye may be obtained. The filaments may be obtained by wet or dry methods. The coloured fibres may be topped with other dyes, particularly with direct dyes for cellulose esters or ethers, e.g. water-insoluble dyes of the nitro-diarylamine, azo, or amino anthraquinone series. The topping colour may be applied locally or uniformly. Specifications 282,036, 313,451, [both in Class 15 (ii)], and 460,575, are referred to. The Provisional Specification also refers to the production of coloured films or foils.