Patent GB-400031-A (GB)
Title: Improvements in dyeing and other treatment baths for textile materials made of or containing animal fibres
Filed: 1933-01-12
Abstract: Dyeing and other bath treatments of textile materials made of or containing animal fibres are effected with an addition to the baths of a sulphonated product obtainable by condensing, suitably in presence of a condensing agent such as sulphuric acid, fuming sulphuric acid or chlorosulphonic acid, an aromatic compound containing nuclear hydroxyl with benzoin and, if necessary, sulphonating the condensation product.  Such addition promotes level dyeing and is useful for producing reserve effects in dyeing mixed fabrics and for preventing bleeding of dyestuffs in fulling baths. Specified sulphonated products are the sulphonic acids and sulphonates of the condensation products from benzoin and phenol, cresols, chlorophenols, salicylic acid, naphthols, oxyanthracenes, oxyanthraquinones, oxyphenanthrenes or oxydiphenyls.  The following examples are specified: (1) Half-wool is treated for \ba3/4\be hr. in a bath at 60 DEG  C. containing Chlorantine red 8 BN, sodium sulphate and a neutral product obtained by condensing sodium 2-naphthol-6-sulphonate with benzoin in conc. sulphuric acid at about 40 DEG  C., and is then washed, rinsed and dried; the wool is scarcely dyed, while the cotton is dyed a strong red; the sodium 2-naphthol-6-sulphonate may be replaced by sodium 2-naphthol-3 : 6-disulphonate or by a naphthol sulphonation mixture.  (2) Half-wool piece goods, preliminarily dyed in a boiling bath containing Orange II, formic acid and sodium sulphate, are rinsed and after-dyed by treatment for \ba3/4\be hr. in a bath containing greenish Direct sky blue, sodium sulphate and a neutral condensation product of 2-naphthol-3 : 6-disulphonic acid with benzoin, and are then washed and dried; a clear two-colour effect is obtained.  (3) Heavy woollen cloth is dyed a level shade by treatment for 1 hr. in a boiling bath containing Benzyl bordeaux B, sulphuric acid, sodium sulphate, and a neutral condensation product of phenol-3-sulphonic acid with benzoin, followed by rinsing, centrifuging and drying.  (4) Wool, dyed in the usual manner in an acid bath with the sodium monosulphonate of the oxidized condensation product of 4 : 4<1> - diethylaminodiphenylcarbinol with N-benzyl-a -naphthyl amine, is mixed with an equal weight of white wool and the mixture is fulled by treatment for 4 hrs. in a liquor containing sulphuric acid and the condensation product of 2-naphthol-6-sulphonic acid with benzoin referred to in (1) above; the white wool remains uncoloured; wool dyed with Orange II or with the chromium compound of the dyestuff 5-nitro-2-aminophenol --> 2 : 6-naphthylaminesulphonic acid may be similarly fulled.  (5) A mixed fabric of wool and acetate artificial silk is dyed by treatment for 1 hr. at 40-80 DEG  C. in a bath containing 1 : 4-dimethyldiaminoanthraquinone, sulphite cellulose liquor, a neutral condensation product of 2-naphthol-3 : 6-disulphonic acid with benzoin, Alizarine sapphire blue B and turkey red oil, an addition of formic acid being advantageously made toward the end of the operation, and is rinsed, centrifuged and driad; a uniform dyeing, fast to rubbing, is obtained.  Specifications 319,249, [Class 2 (iii), Dyes &c.], and 379,442 are referred to.