Patent GB-601347-A (GB)
Title: Process for producing fast dyeings
IPC: C09B45/14
Filed: 1945-10-05
Abstract: Fibres are dyed by the single bath process in a bath containing an agent yielding metal and also an ester obtainable by acylating an azo-dyestuff containing the atomic grouping x-R1-N=N-R2-y, wherein R1 represents an aromatic nucleus, x represents a hydroxyl or carboxyl group which is capable of taking part in the formation of a heavy metal complex and is the ortho position with respect to the -N=N- group and R2-y represents the residue of a coupling component in which y is a hydroxyl group in the ortho position with respect to the -N=N- group, with an organic acylating agent which contains in addition to the acylating group at least one substituent capable of forming a salt.  The agent yielding metal may be an agent yielding chromium, copper, nickel, iron or cobalt, e.g. the dyebath may contain an alkali chromate and an ammonium salt.  The process may be applied to animal fibres, natural silk, animalised cellulose fibres or artificial fibres of casein, superpolyamides or superpolyurethanes.  Cotton or regenerated cellulose may be dyed in the presence of agents yielding copper with esterified parent dyestuffs which are derived from components which impart affinity for vegetable fibres.  In examples: (1) and (4) wool is dyed in a bath containing ammonium sulphate, sodium chromate, Glauber salt and the dye derived from benzoyl chloride-3-sulphonic acid and 1-aminobenzene-2-carboxylic acid --> 2-oxynaphthalene or 1 - oxy - 2-amino - benzene --> acetoacetic acid ortho-anisidide; (2) and (3) wool is dyed in a bath containing ammonium sulphate, sodium chromate, Glauber salt and the dye derived from benzoyl chloride-3 : 5-disulphonic acid and 1-oxy-2-aminobenzene --> 1-(21-chloro-phenyl)-3-methyl-5-pyrazolone or 1-oxy-2-aminobenzene --> 2 : 4-dioxyquinoline; (5) wool is dyed in a bath containing ammonium sulphate, sodium chromate, Glauber salt and the dye derived from benzoic acid-3 : 5-disulphochloride and 1-oxy-2-amino-4-chlorobenzene --> 2-oxynaphthalene or 1-oxy-2-amino-4-chlorobenzene --> 2 : 4-dioxyquinoline; (6) wool is dyed from a bath containing sodium sulphate and cobalt acetate or copper sulphate and the dye derived from benzoic acid-3 : 5-disulphochloride and 2-amino-1-oxybenzene --> 1 - (21-chlorophenyl)-3-methyl-5-pyrazolone; (7) wool is dyed from a bath containing sodium sulphate, ammonium ferrosulphate and the dye derived from benzoic acid-3-sulphochloride and anthranilic acid --> 2-oxynaphthalene; (8) wool is dyed in a bath containing sodium sulphate, and nickel sulphate or cobalt acetate, and the dye derived from benzoic acid-3-sulphochloride and 4-chloro-2-amino-1-oxybenzene --> 2-oxynaphthalene. Polyazo-dyestuffs containing at least one atomic grouping of the above formula may be used for the process of the invention, e.g. the dyestuffs obtained by coupling tetrazotized 4 : 41-diamino-3 : 31-dioxydiphenyl with 2-oxynaphthalene; diazotized 41-chloro-4-amino-2-methyl-5-oxy-1 : 11-azobenzene with 2-oxynaphthalene or 1-oxy-4-methylbenzene; and diazotized 1-oxy-2 - amino - 4 - chlorobenzene and diazotized 1-amino-4-chlorobenzene with 1 : 3-dioxybenzene.  Specifications 480,358 and 482,184 are referred to.