Patent GB-737800-A (GB)
Title: Process for dyeing or printing cellulose-containing textile materials and solutions and dyestuff preparations therefor
Filed: 1952-11-14
Abstract: In the dyeing or printing of cellulose-containing textile materials with metalliferous azo-dyestuffs sparingly soluble in water, there is employed a neutral to alkaline dyebath or printing paste comprising a dyestuff containing at least two azo linkages and capable of forming metal compounds sparingly soluble in water, an amine, preferably an aliphatic amine, which contains at least one amino group separated by two carbon atoms from an HO-group, phosphorus-containing anions of a phosphoric acid containing at least two phosphorus atoms in the acid molecule, especially a phosphoric acid of the constitution Hm+2PmO3m+1 in which m is a whole number greater than 1, and an alkali-resistant compound of Co, Ni or Cu, advantageously a compound in which the metal is bound to at least one of the aforesaid substances.  Thus the dyebath or paste may initially contain a dyestuff premetallized with Co, Ni or Cu, or metallization may be effected in situ.  When a premetallized dyestuff is employed the bath or paste also contains the amine together with an alkali pyro- or poly-phosphate; or a pyro- or poly-phosphate of the amine, e.g. the neutral pyrophosphate of 1 : 2 - di - (b  - oxyethyl - amino) - ethane, together with alkali hydroxide.  When a metal-free dyestuff is initially employed, the bath or paste also contains an alkali pyro- or poly-phosphate together with a metal compound of the amine, e.g. copper glycocoll; or the amine together with sodium-copper pyrophosphate; or the reaction product of copper pyrophosphate with the amine, e.g. the complexes of the formul [Cu(HO-CH2-CH2-NH-CH2-CH2-NH -CH2-CH2-OH)]2P2O7 and <FORM:0737800/IV (c)/1> or an alkali pyro- or poly-phosphate together with the amine and a copper compound, e.g. a complex alkali-copper compound of an aliphatic oxycarboxylic acid such as lactic, citric or tartaric acid, e.g. sodium-copper tartrate.  Specified amines are monoethanolamine, aminoacetic acid, b -oxyethylamino-acetic acid, 2-amino - 1 - oxybenzene - 4 - sulphonamide and those of the following formul : <FORM:0737800/IV (c)/2> (or a mixture thereof with 2-amino-ethanol.) <FORM:0737800/IV (c)/3> Specified phosphorus containing anions are those of the acids H4P2O7, H5P3O10 and H6P4O13.  The bath or paste may also contain urea, saccharose and dextrin.  Dyeings or prints may be after-treated with the reaction product of formaldehyde with cyanamide, dicyandiamide, dicyandiamidine or melamine.  Numerous examples are given of the dyeing and printing of cotton. Specifications 737,803 and 737,806 are referred to.ALSO:Mention is made (example 6) of the neutral pyrophosphate <FORM:0737800/IV (b)/1> which is prepared by adding 1 : 2-di-(b -oxyethylamino)-ethane to aqueous pyrophosphoric acid.  Similarly (example 14), the copper pyrophosphate complex is prepared employing copper pyrophosphate instead of the free acid.  The complex <FORM:0737800/IV (b)/2> is similarly prepared from copper pyrophosphate and 2-aminoethanol. Mention is also made (example 3) of the preparation of a mixture of 1 : 2-di-(b -oxyethylamino)-ethane and 2-aminoethanol by adding 1 : 2-dichlorethane to heated 2-aminoethanol, then adding a suspension of sodium hydroxide in ethanol and finally filtering.ALSO:Mention is made (example 9) of sodium copper pyrophosphate, which is prepared by adding hot aqueous sodium pyrophosphate to aqueous copper sulphate to form copper pyrophosphate, which is filtered off and added to boiling aqueous sodium pyrophosphate, the solution then being evaporated in vacuo.  Sodium nickel pyrophosphate is prepared in a similar manner.