Patent GB-609197-A (GB)
Title: Improvements in the production of coloured artificial textile materials
IPC: D06L4/657
Filed: 1946-03-08
Abstract: Artificial filaments are coloured and dyed with both a coloured fluorescent pigment and a fluorescent dye so as to exhibit good colour intensity both in visible light and in ultra-violet light. A finely-divided coloured fluorescent pigment may be incorporated in a filament-forming composition or solution and the extruded filaments may be dyed with a fluorescent dye.  The filaments may be used in making fabrics for decorative purposes or for military purposes.  The filaments may have a basis of regenerated cellulose, cellulose derivative, or synthetic resin, e.g. cellulose acetate, propionate, or butyrate, cellulose mixed esters, ethyl cellulose, benzyl cellulose, synthetic linear condensation polyamides, polyvinyl chloride, or vinyl chloride-acetate copolymer.  The proportion of fluorescent pigment may be 0.01 to 10 per cent by weight of the filament-forming substance present in the spinning solution and it may have a particle size of 0.1 to 5 microns.  The pigment may be added to the spinning dope at a point near the extrusion nozzles. For yellow fluorescent colour, mixtures of zinc sulphide and cadmium sulphide, or cadmium tungstate may be used.  For red, there may be used fluorescent zinc sulphide, mercuric oxide, potassium dichromate, magnesium dichromate, barium chromate, thorium dichromate, rhodium thiocyanate, Rhodamine BX tungstate lake, or Barium red lake C toner. For a blue fluorescence there may be used Peacock Blue lake, Milling Blue BC, and Alizarine Blue SE.  For green, a zinc sulphide preparation, or Brilliant Green tungstate lake, Auramine OO tungstate lake, or Malachite Green tungstate lake may be used.  A violet colour may be obtained by using Ethyl Violet tungstate lake.  The pigmented artificial filamentary materials may be dyed in yarns in hanks or on bobbins or may be woven into fabrics and then dyed.  For regenerated cellulose filaments, the fluorescent dyestuff used may be Chlorazol Yellow 2GS, Primuline AS, Thioflavine S, or Diamine Rose BD.  For cellulose acetate filaments there may be used Alizarine Blue SAPX, Rhodamine CG, Auramine O, Thioflavine T, or Calconese Fluorescent Yellow.  For polyamide filaments, the fluorescent dyestuff may be Rhodamine B, Milling Red C, or Ink Blue G.  The dyebaths may contain 0.1 to 1 per cent of fluorescent dyestuff and may be heated to 150-190 DEG  F.  The filaments may be subjected to stretching to enhance their tenacity.  Cellulose ester filaments may be subjected to saponification treatment.  In an example, cellulose acetate filaments are obtained by extruding a spinning solution containing zinc sulphide which has been prepared so as to have a cerise colour in daylight and a red fluorescence.  A satin weave fabric made of these pigmented filaments is dyed in a bath containing Rhodamine B, formic acid, and water, at 170 DEG  F.ALSO:Artificial filaments are coloured and dyed with both a coloured fluorescent pigment and a fluorescent dye so as to exhibit good colour intensity both in visible light and in ultra-violet light. A finely-divided coloured fluorescent pigment may be incorporated in a filament-forming composition or solution and the extruded filaments may be dyed with a fluorescent dye.  The filaments may be used in making fabrics for decorative purposes or for military purposes.  The filaments may have a basis of regenerated cellulose, cellulose derivative, or synthetic resin, e.g. cellulose acetate, propionate, or butyrate, cellulose mixed esters, ethyl cellulose, benzyl cellulose, synthetic linear condensation polyamides, polyvinyl chloride, or vinyl chloride-acetate copolymer.  The proportion of fluorescent pigment may be 0.01 to 10 per cent by weight of the filament-forming substance present in the spinning solution and it may have a particle size of 0.1 to 5 microns.  For yellow fluorescent colour, mixtures of zinc sulphide and cadmium sulphide, or cadmium tungstate may be used. For red, there may be used fluorescent zinc sulphide, mercuric oxide, potassium dichromate, magnesium dichromate, barium chromate, thorium dichromate, rhodium thiocyanate, Rhodamine BX tungstate lake, or Barium red lake C toner.  For a blue fluorescence there may be used Peacock Blue lake, Milling Blue BC, and Alizarine Blue SE.  For green, a zinc sulphide preparation, or Brilliant Green tungstate lake, Auramine OO tungstate lake, or Malachite Green tungstate lake may be used. A violet colour may be obtained by using Ethyl Violet tungstate lake.  The pigmented artificial filamentary materials may be dyed in yarns in hanks or on bobbins or may be woven into fabrics and then dyed.  For regenerated cellulose filaments, the fluorescent dyestuff used may be Chlorazol Yellow 2GS, Primuline AS, Thioflavine S, or Diamine Rose BD.  For cellulose acetate filaments there may be used Alizarine Blue SAPX, Rhodamine GG, Auramine O, Thioflavine T, or Calconese Fluorescent Yellow.  For polyamide filaments, the fluorescent dyestuff may be Rhodamine B, Milling Red C, or Ink Blue G.  The dyebaths may contain 0.1 to 1 per cent of fluorescent dyestuff and may be heated to 150-190 DEG  F. Cellulose ester filaments may be subjected to saponification treatment.  In an example, cellulose acetate filaments are obtained by extruding a spinning solution containing zinc sulphide which has been prepared so as to have a cerise colour in daylight and a red fluorescence.  A satin weave fabric made of these pigmented filaments is dyed in a bath containing Rhodamine B, formic acid and water, at 170 DEG  F.