Patent GB-605696-A (GB)
Title: Improvements in printing with ester salts of leuco vat-dyestuffs and preparations therefor
Filed: 1942-10-23
Abstract: Printing with a sparingly-soluble-alkali salt of an ester of a leuco vat dye is effected with the use in the printing paste of a dispersing agent consisting of a salt of a primary, secondary or tertiary nitrogenous organic base, carrying at least one hydroxyalkyl group, with an organic acid free from ester groups. Specified bases are alkylolamines, reaction products of halohydrins or alkylene oxides with ammonia, amines, hydroxyamines or polyalkylenepolyamines, glucamine, diglucamine, aromatic alkylolamines, N-hydroxyethyl - piperidine, N - hydroxyethylmorpholine, and hydroxyethyl ethers of triethanolamine, diethylaminoethanol, tetraethanol-ethylenediamine, asym.-diethyl-diethanolethylenediamine, N-di-hydroxyethylaniline, N - hydroxyethyl - piperidine or N - hydroxyethylmorpholine. Specified acids are lactic, tartaric, oxalic, succinic, benzoic, hydroxybenzoic, phthalic, pyromucic, oleic, sulphoricinoleic, p-toluenesulphonic, dimethylanilinesulphonic, naphthalenesulphonic, alkylnaphthalenesulphonic and sulphobenzoic acids.ALSO:Printing with a sparingly-soluble alkali salt of an ester of a leuco vat dye is effected with the use in the printing paste of a dispersing agent consisting of a salt of a primary, secondary or tertiary nitrogeneous organic base, carrying at least one hydroxyalkyl group, with an organic acid free from ester groups. Specified bases are alkylolamines, reaction products of halohydrins or alkylene oxides with ammonia, amines, hydroxyamines or polyalkylenepolyamines, glucamine, diglucamine, aromatic alkylolamines, N - hydroxyethyl - piperidine, N - hydroxyethyl-morpholine, and hydroxyethyl ethers of triethanolamine, diethylaminoethanol, tetraethanol-ethylenediamine, asym.-diethyl-diethanol - ethylenediamine, N - dihydroxyethyl-aniline, N-hydroxyethyl-piperidine or N-hydroxyethyl-morpholine.  Specified acids are lactic, tartaric, oxidic, succinic, benzoic, hydroxybenzoic, phthalic, pyromucic, oleic, sulphoricinoleic, p-toluenesulphonic, dimethylanilinesulphonic, naphthalenesulphonic, alkylnaphthalenesulphonic and sulphobenzoic acids Examples are given in which cotton is printed with pastes containing one of the following dyes, namely the sodium salts of the acid sulphuric acid esters of leuco-2,1-6,5-anthraquinone-diphenyl-thiazole, leuco-dibromanthanthrone, leuco-2,1-naphthioindigo, leuco-dichloroanthanthrone, leuco-6,61-diethoxy-thioindigo, leuco-6,61-dichloro - 4,41-dimethyl-thioindigo and leuco-3,4-8,9-dibenzpyrenequinone, and one of the following salts, namely, the formate, acetate, lactate, oxalate or tartrate of the tri-b -hydroxyethyl ether of triethanolamine, the lactate of the tetrahydroxy polyethyl ether of the tetraethanol-ethylenediamine (from tetraethanol-ethylenediamine and 8 mols. of ethylene oxide), the lactate of the mixture of hydroxy ethers of diethylaminoethanol (from diethylaminoethanol and 4 mols. of ethylene oxide in methanol solution), the monochloroacetate of the tri-b -hydroxyethyl ether of triethanolamine, the lactate, phthalate, or monochloroacetate of the trihydroxy polyethyl ether of triethanolamine (from 18 mols. of ethylene oxide and triethanolamine in aqueous solution), the phthalate of triethanolamine, the dimethylaniline-p-sulphonate of the trihydroxyethyl ether of triethanolamine, and the naphthalene-1-sulphonate of the tri-b -hydroxyethyl ether of triethanolamine.