Patent GB-590536-A (GB)
Title: Improvements in the fixation of dyestuffs on textile fibres
IPC: D06P1/56
Filed: 1945-04-10
Abstract: The fixation of dyestuffs is improved by treating the fibres, before or after dyeing or printing, with acid-soluble condensation products obtained by reacting formaldehyde with p-phenylenediamine, toluylene - 2,5 - diamine, benzidine, tolidine, o-dianisidine, pp1-diaminodiphenylamine, pp1 - diamino - diphenylmethane or pp1 - diaminoditolylmethane.  The formaldehyde may be reacted with the diamine in aqueous alkaline or acid solution and in the former case the product is subsequently dissolved in acid.  In examples: (1) unmercerized cotton dyed with Chlorazol Green PLS is treated with a solution A obtained by boiling p-phenylene diamine solution with formaldehyde in presence of HCl, adding sodium acetate and acetic acid and diluting; (2) unmercerized cotton dyed with Durazol Fast Blue 8GS is treated with solution A; (3) unmercerized cotton dyed with Chlorazol Green PLS is treated with solution B obtained by condensing formaldehyde with pp1 - diaminodiphenylmethane in presence of HCl, adding sodium acetate and acetic acid and diluting; (4) unmercerized cotton dyed with Durazol Fast Blue 8GS is treated with solution B; (5) natural silk dyed with Chlorazol Black BH is treated with solution A; (6) woollen yarn dyed with Chlorazol Fast Red FS is treated with solution A; (7) unmercerized cotton yarn is treated with solution A and dyed with Durazol Fast Blue 8GS; (8) cotton yarn treated with solution A and untreated cotton yarn are together dyed with S.R.A. Golden Yellow IX paste and finally treated with solution A; (9) cotton yarn treated with solution A and untreated cotton yarn are together dyed with Coomassie Milling Scarlet G and then further treated with solution A; (10) cotton yarn treated with solution A and untreated cotton yarn are dyed with Soledon Blue 2RCS powder, followed by treatment with sodium hypochlorite; (11) a solution of pp1-diaminodiphenylmethane hydrochloride, obtained from aniline hydrochloride and formalin, is condensed with formalin in presence of HCl, mixed with sodium acetate and acetic acid and diluted, and the solution obtained is used for the treatment of cotton webbing dyed with Chlorazol Fast Scarlet 4BS; (12) viscose staple fibres are treated with a solution containing the condensation product from pp1-diaminodiphenylmethane and formaldehyde, and dyed with Coomassie Violet RS; (13) unmercerized cotton and viscose yarn dyed with Chlorazol Green PLS is treated with a solution containing the condensation product from toluylene-2,5-diamine and formaldehyde; (14) unmercerized cotton and viscose yarn dyed with Chlorazol Sky Blue FF is treated with a solution containing the condensation product from benzidine and formaldehyde; (15) mercerized cotton and cuprammonium rayon yarn dyed with Chlorazol Fast Red FS is treated with the condensation product from tolidine and formaldehyde; (16) unmercerized cotton and viscose yarn dyed with Chlorazol Green PLS is treated with the condensation product from dianisidine and formaldehyde; (17) unmercerized cotton webbing dyed with Chlorazol Green PLS is treated with the condensation product from Fourrine DB (pp1 - diaminodiphenylamine hydrochloride) and formaldehyde; (18) unmercerized cotton and viscose yarn dyed with Chlorazol Brown LFS is treated with the condensation product from diaminoditolylmethane and formaldehyde; (19) casein fibre dyed with Direct Green B is treated in solution A or B; and (20) casein fibre dyed with Naphthalene Red JS is treated with solution A or B.