Patent GB-1080056-A (GB)
Title: 1:2-chromium-complexes of a reactive disazo dye and a monoazo dye and their use
IPC: C09B62/032
Filed: 1964-10-06
Abstract: The invention comprises chromium containing dyes of the formula <FORM:1080056/C4-C5/1> wherein A1 represents a radical of the benzene or naphthalene series containing no reactive groups, B represents a radical of the benzene, naphthalene or baryl-pyrazole series containing no reactive groups, each of A1 and B containing the oxygen -O- in o-position to the azo bond, n represents a positive whole number of at most 3, A2 represents a sulphonated radical of the benzene or naphthalene series containing no reactive groups, which radical apart from -SO3H groups, contains no other ionogenic substituents and Z represents a radical containing at least one grouping <FORM:1080056/C4-C5/2> halogen, halogen being Cl or Br, which grouping is a portion of a triazinyl radical or an optionally condensed diazinyl radical. The benzene ring D can also contain C1-C2 alkyl and alkoxy groups.  The may be obtained either by reacting a complex Cr compound of the formula <FORM:1080056/C4-C5/3> with a metallizable disazo dyestuff of the formula <FORM:1080056/C4-C5/4> or by reacting a Cr complex of the formula <FORM:1080056/C4-C5/5> with an acylating agent introducing the radical Z.  The dyestuffs may be used to dye cellulose material and polyamide fibres brown-black to green-black shades (see Division D1).  Examples are given for the production of the dyes.  The starting material of Formula (IV) is obtained by reacting a complex Cr compound of Formula (I) with an aminodisazo dyestuff of Formula (II).  Reference has been directed by the Comptroller to Specification 851,861.ALSO:Chromium containing dyestuffs of the formula:  <FORM:1080056/D1-D2/1> wherein A1 represents a radical of the benzene or naphthalene series containing no reactive groups, B represents a radical of the benzene, naphthalene or 1-aryl-pyrazole series containing no reactive groups, each of A and B containing the oxygen -oin o-position to the azo bond, n represents a positive whole number of at most 3, A2 represents a sulphonated radical of the benzene or naphthalene series containing no reactive groups, which radical, apart from -SO3H groups, contains no other ionogenic substitutents, and Z represents radical containing at least one grouping -N=C-halogen, halogen being Cl or Br, which grouping is a portion of a triazinyl radical or an optionally condensed diazinyl radical.  The benzene ring D optionally containing C1-C2 alkyl and alkoxy groups; are used in the form of their alkali metal salts to dye cellulose materials, for example staple fibre, jute, ramie, hemp and cotton; also polyamide fibres, for example natural polyamide fibres such as wool or silk, or synthetic polyamide fibres such as nylon, brown-black to green-black shades.  Natural polyamide fibres may be dyed in the presence of auxiliaries such as fatty acid/alkanolamine polycondensation products.  Cellulose fibres may be impregnated or printed at a low temperature with the optionally thickened dye solution and the dye then fixed by treatment with acid-binding agents.  In examples cotton and wool are dyed.  851,861.