GB366918A - Improvements in the dyeing of textiles - Google Patents

Abstract

The fastness of dyeings produced on textile or cellulosic materials by means of water-soluble dyestuffs is improved by treating the dyed material with a water-soluble salt of a diamine in which one amino-group is mono- or di-acylated by means of an acyl group containing an aliphatic or hydrocyclic residue of at least 10 carbon atoms, or with a corresponding quaternary ammonium compound, e.g. "Sapamines" (cf. Specifications 219,304 and 294,582, [both in Class 2 (iii), Dyes &c.], and French Specification 687,224). An improvement in fastness is also observed in the case of dyeings which are subsequently developed, p e.g. by after treatment with formaldehyde, or by diazotization and coupling on the fibre. Direct dyestuffs may thus be used for dyeing hat-bands, umbrella silks, batique goods, half-wool or half-silk goods. Dyeings on cotton, regenerated cellulose, natural or loaded silk, wool and acetate silk may be after-treated. In examples, (1) cotton yarn dyed with Direct Safranine R.W. is treated with the trimethylammoniummethylsulphate of monostearyl-p-phenylenediamine (from stearic acid and p-aminodimethylaniline and addition of dimethylsulphate); the dyeing is faster to water; (2) bleached cotton material dyed with Direct Fast Violet BL is treated with the trimethylammoniummethylsulphate of monostearylethylenediamine; (3) a mixed fabric of viscose and cotton is dyed with Rigan Blue G and treated with the acetate of mono-oleyl-oxypropylenediamine (cf. Specification 346,387); (4) viscose thread dyed with Melantherine BH is treated with the trimethylammonium-methylsulphate of monooleylethylenediamine; (5) dyed half-silk ribbon (cotton and silk) is treated with the acetate of monooleylethylenediamine. (6) In half-wool the cotton is dyed with Chlorantine Fast Blue CLN after-treated as in (4) and the wool dyed with Kiton Fast Orange G; the direct dyestuff becomes fast to top dyeing. (7) Halfwool material is first dyed in an acid bath with Tartrazine, rinsed and the cotton then dyed with Direct Sky Blue, with or without a reserve such as Katanol W; the dyed material is after-treated in a separate bath as in (2). (8) Loaded silk piece goods are dyed with Alizarin Fast Blue BB and after-treated as in (4). (9) Cotton velvet dyed with Direct Safranine B is discharged with sodium sulphoxylate and then passed through a solution of the trimethylammonium - methylsulphate of mono-oleylethylenediamine; the velvet may be left in warm water without fear that the colour will run; the treatment may be interposed between the dyeing and printing operations. (10) Cotton fabric is printed with Chlorantine Fast Blue RL and after steaming is treated with a bath containing oleylaminoethyl-diethylmethylammonium-methylsulphate. (11) Tissue paper is dyed with Direct Safranine B or Kiton Blue A and after-treated in a bath as in (10). Other products may be similarly used, such as the trimethylammonium-methylsulphate of monostearyl-m-phenylene diamine (from stearic acid and m-aminodimethylaniline and addition of dimethylsulphate); the addition product of dimethylsulphate and o-, m-, or p-dimethylaminophenylcarbamic acid hexadecyl or octodecyl ester (from the chlorformic ester of hexadecyl or octodecyl alcohol and o-, m-, or p-aminodimethylaniline); the hydrochloride of diethylaminoethylimino-dicarboxylic acid dimenthyl ester (cf. Specification 203,608, [Class 2 (iii), Dyes &c.], or the corresponding addition product with dimethyl sulphate. Other examples are given in the Provisional Specification.