Patent GB-441296-A (GB)
Title: Process for retarding the absorption or re-absorption of vat-dyestuffs and sulphur dyestuffs by the fibre
IPC: A63F1/06
Filed: 1934-09-12
Abstract: The absorption or re-absorption by fibrous materials of vat or sulphur dyestuffs in alkaline reducing baths for dyeing, levelling or stripping is retarded by incorporating in the baths a sulphonated benzimidazole or naphthimidazole, carrying as substituent in the imidazole ring an aliphatic or cycloaliphatic residue having at least 8 carbon atoms, which may be interrupted by an oxygen, sulphur or nitrogen bridge.  Such components are described in Specification 403,977.  The following examples are specified: (1) 0,25 Gram per litre of a sulphonated N-methyl-m -heptadecylbenzimidazole is added to a dyebath for cotton containing alkaline hydrosulphite and the dyestuff obtainable by trichlorinating isodibenzanthrone in nitrobenzene. (2) An unlevel dyeing on a cotton fabric with Cibanone blue 3G is levelled by treatment for \ba1/2\be hour in an alkaline hydrosulphite bath at 60 DEG  C. containing 1 gram per litre of the product of sulphonation of the mixture of N-methylimidazoles from o-phenylenediamine and hydrogenated fish oil; the same product may be used in a stripping bath.  (3) An unlevel dyeing of a shirting material with Cibanone blue GCD is levelled by treatment for \ba1/2\be hour in an alkaline hydrosulphite bath at 60 DEG  C. containing 0,2 gram per litre of the product of sulphonation of a mixture of N-methyl-m -heptadecylbenzimidazole and N : N-methyl : ethyl-m -heptadecylbenzimidazolium chloride.  (4) A linen fabric is repeatedly padded in a bath containing Cibanone violet 2R and the sulphonation product of (3) and the dyeing is developed by treatment in an alkaline hydrosulphite bath at 60 DEG  C. (5) Loose wool is dyed in a bath containing Ciba blue 2B, glue, ammonia, sodium hydrosulphite and 0,5 gram per litre of the sodium salt of sulphonated N-methyl-m -heptadecylbenzimidazole. (6) Mercerized bead yarn is dyed in a vat containing Cibanone violet 2R, Cibanone blue 3G and 0,2 gram per litre of the sodium salt of sulphonated N-methyl-N-benzyl-m  - heptadecylbenzimidazolium chloride.  (7) Cotton drapery material is dyed in a sulphur dyestuff bath containing Pyrogene indigo containing 0,3 gram per litre of the sodium salt of N-methyl-m -heptadecylbenzimidazolesulphonic acid.  The Specification as open to inspection under Sect. 91 comprises also the incorporation in the baths of compounds, other than the above benzimidazoles or naphthimidazoles, containing at least one basic nitrogen atom, at least one sulphonic or sulphuric acid ester group, and an aliphatic or cycloaliphatic residue containing at least 8 carbon atoms, which may be interrupted by an oxygen, sulphur or nitrogen bridge. Specified compounds are cetylaniline- and cetylmethylaniline-sulphonic acids, the sulphonated quaternary product from dimethyl sulphate and cetylmethylaniline, benzyl-methyl-dodecylaminesulphonic acid, the sulphonated dodecyl ether of dimethyl- or diethyl-m- or p-aminophenol, the sulphuric acid ester of oxyethylcetylmethylamine, the sulphonated addition products from benzyl chloride and stearoyldiethylethylenediamine, dimethylaminoethylcetyl ether or diethylaminoethylcetyl thioether (all obtainable by sulphonation of the unsulphonated compounds with sulphuric or chlorosulphonic acid) and cetylmethylamino-ethanesulphonic acid (obtainable by condensing cetylmethylamine with chloroethanesulphonic acid in presence of an acid-binding agent).  In an additional example, cotton piece goods are dyed in an alkaline hydrosulphite vat containing Cibanone violet 2R and the sodium salt of the sulphonated quaternary cetylphenyldimethyl-ammonium methosulphate or of sulphonated cetylmethylaniline or of sulphonated cetylaniline.  This subject-matter does not appear in the Specification as accepted.