Neues Verfahren zum Faerben von Cellulosefasern

• Main Authors: KURT WEBER,DR, INGOLD,ERWIN
• Format: Patent
• Language: German
• Published: 21.11.1968
• Subjects: ADHESIVES; CHEMISTRY; DYEING LEATHER, FURS, OR SOLID MACROMOLECULAR SUBSTANCES INANY FORM; DYEING OR PRINTING TEXTILES; DYES; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; LAKES; LAUNDERING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; PAINTS; POLISHES; TEXTILES; TREATMENT OF TEXTILES OR THE LIKE

The invention comprises azo-dyes free from polycyclic quinones, nitro, ureido, amino and acid hydroxyl groups (i.e. hydroxyl groups bound directly to a carbon atom of a -C = C-double bond or enolizable keto groups) and which have the general formula <FORM:1120449/C4-C5/1> wherein X is H, -CH3, -COOH or a radical <FORM:1120449/C4-C5/2> wherein n is 1 or 2; R is a benzene residue; R1 is an aryl residue; Y is an aromatic or heterocyclic carboxylic acid amide group or a residue of the formula <FORM:1120449/C4-C5/3> which is bound to R1 through an aromatic or heterocyclic carboxylic acid diamide bridge; and wherein R1, R and X are as above, and the two symbols R, the two symbols R1 and the two symbols X may be identical. Preferably, R is a phenylene radical; R1 is a benzene, thiophene or naphthalene residue which may contain halogen, methyl, methoxy or acylamino substituents and the dicarboxylic acid diamide bridge is derived from benzene, naphthalene or thiophene, the dyes containing one sulphonic acid group per benzthiazole residue. They are prepared by (1) acylating an amino-azo dyestuff containing 1 or 2 benzthiazole groups with a reactive derivative, e.g. anhydride or acid chloride of an aromatic or heterocylic mono- or di-carboxylic, (2) reacting a mono- or dinitroarylamide of an aromatic or heterocyclic dicarboxylic acid with one or two aminophenylbenzthiazoles so that the nitro and amino groups are reductively condensed to form an azo bridge, (3) coupling a mono- or di-carboxylic acid arylamide with one or two diazotized aminophenylbenzthiazole any residual amino groups being acylated with aromatic or heterocyclic carboxylic or sulphonic acids and any hydroxyl groups being alkylated or acylated with carboxylic or sulphonic acids or (4) sulphonating or chloro-sulphonating a benzthiazole azo compound free from sulphonic acid groups with concentrated sulphuric acid, oleum or chlorosulphonic acid any sulphochloride groups being hydrolysed to sulphonic acid groups. Preferred dyes have the general formula <FORM:1120449/C4-C5/4> wherein the anilide phenylene radicals may contain a methoxy group ortho to the -CONH- link. The dyes are applied to natural or regenerated cellulose as described in Specification 1,120,448.