Patent GB-653221-A (GB)
Title: Process for the temporary colouration of nylon fibres, threads, yarns or the like
Filed: 1948-11-22
Abstract: One or more inorganic pigments are applied to nylon fibres, threads, yarns or the like for identification purposes during the manufacture of textile materials and are removed by a scouring operation at a subsequent stage in the process of manufacture. The pigment may be removed after the textile material has been subjected to a treatment with steam.  The pigment may be applied to the surface of the nylon fibres by treating them with a dispersion of the pigment in water, preferably in the presence of sodium oleate or other surface active agent.  If desired, the pigment may be added to the warp size or knitting gum which is applied to the nylon fibres or yarns, and it may be added in the form of a suspension in presence of a surface active agent.  The quantity of pigment may be added in a proportion of about 0.5 to 2 per cent by weight of the warp size or knitting gum.  The pigment may be Prussian blue; a barium chromate, lead chromate, basic lead chromate, molybdenum-containing lead chromate, or zinc chromate pigment; red or yellow iron oxide, Brunswick green, chrome oxide green, chrome green, cadmium yellow, carbon black, or a manganese pigment.  The scouring treatment may be a treatment with a warm solution of soap or other detergent, e.g. a 0.3 per cent soap solution at 50-60 DEG  C.  In an example, polyhexamethylene adipate yarn in cone form is splashed with a suspension of ultramarine, prepared by adding 1 part of ultramarine to a boiling solution of 1 part of sodium oleate in 50 parts of water, mixing, cooling by adding 50 parts of cold water, and again mixing.  The yarn is subsequently decolourized by treatment with soap solution at 40-50 DEG  C.  Nylon warp threads are treated with a size, consisting of an emulsion of paraffin wax and casein, to which has been added Pure Scarlet Chrome M.S. in the form of a paste with a condensation product of cetyl alcohol with 17 molecular proportions of ethylene oxide.  After weaving, the threads are decolourized by treatment with water containing sodium 4-oleylamino-1-methoxybenzene-2-sulphonate.  Nylon knitting yarns are tinted by treatment with a knitting gum, consisting of an aqueous solution of polyvinyl alcohol and boric acid, to which has been added Pure Lemon Chrome 3 GNS in the form of a paste with a condensation product of cetyl alcohol with 17 molecular proportions of ethylene oxide.  Scouring may be effected with a solution of soap and soda ash.  Nylon knitting yarns are tinted with Pure Scarlet Chrome M.S. which is incorporated in the knitting gum in the form of a paste with the sodium salt of a condensation product of formaldehyde with naphthalene sulphonic acid. After knitting, the material is subjected to treatment with steam under pressure to set with the formation of the loops.  The pigment is then removed by treatment with warm soap solution. Specifications 251,580, [Class 2 (ii)], and 552,190 are referred to.ALSO:Inorganic pigments are applied for identification purposes to nylon fibres, threads, yarns, or the like during the manufacture of textiles and are subsequently removed by a scouring operation. The pigment may be added to a warp size or knitting gum, and it may be added in the form of an aqueous suspension in presence of a surface active agent.  The scouring treatment may be effected with a solution of soap or other detergent, e.g. with 0.3 per cent soap solution at 50-60 DEG  C.  In an example, nylon warp threads are treated with a size consisting of an emulsion of paraffin wax and casein to which has been added Pure Scarlet Chrome M.S. in the form of a paste with a condensation product of cetyl alcohol with 17 molecular proportions of ethylene oxide.  After weaving, the threads are decolourized by treatment with water containing sodium 4-oleylamino-1-methoxybenzene-2-sulphonate. Nylon knitting yarns are tinted by treatment with a knitting gum, consisting of an aqueous solution of polyvinyl alcohol and boric acid, to which has been added Pure Lemon Chrome 3 G.N.S. in the form of a paste with a condensation product of cetyl alcohol with 17 molecular proportions of ethylene oxide.  Scouring is effected with a solution of soap and soda ash.  In another example, nylon knitting yarns are tinted with Pure Scarlet Chrome M.S. which is incorporated in the knitting gum in the form of a paste with the sodium salt of a condensation product of formaldehyde with naphthalene sulphonic acid. Specifications 251,580, [Class 2 (ii)], and 552,190 are referred to.