Patent GB-414872-A (GB)
Title: Process for dyeing furs
IPC: D06P3/30
Filed: 1933-06-01
Abstract: Furs are dyed by treatment with a dyestuff containing metal in complex union after pre-treatment with a chrome mordant which imparts resistance to high temperature to the skin portion e.g. with chrome-alum, alkali bichromates, chromium sulphate and basic solutions of chromium oxide salts, and also with a chlorinating agent, e.g. alkali hypochlorite or phosphates which increase the capacity of the hair for taking up the dyestuff and promote even dyeing.  Suitable dyestuffs are the mono-metal or poly-metal compounds, e.g. the chromium, copper, nickel, cobalt, titanium, vanadium, manganese and iron compounds, of mono- and polyazo-dyestuffs or the chromium compounds of the anthraquinone derivatives.  Furs tanned with alum are treated in a bath containing chromium sulphate, they are then rinsed and fulled in a bath containing formic acid.  After centrifuging, they are introduced into a bath containing Javelle liquor or chloride of lime together with some sulphite cellulose liquor.  The furs are again centrifuged, fulled in a bath containing dilute formic acid and then introduced into the dye-bath which also contains formic acid.  After dyeing, the furs are rinsed and treated on the flesh side with a solution of yolk of egg to keep them supple during drying.  Orange shades are obtained with the chromium compound of 2 - amino - 1 - phenol - 4 : 6 - disulphonic acid --> 1-phenyl-3-methyl-5-pyrazolone and with the nickel compound from 4-chloro-2-amino-1-phenol-6-sulphonic acid --> resorcinol.  Blue shades are obtained with the chromium compound of 1-amino-2-oxynaphthalene-4-sulphonic acid --> b -naphthol and with the chromium and copper compound from 5-nitro-2-amino-1-phenol --> 2-phenylamino-5-oxynaphthalene-7 sulphonic acid and with the primary disazo-dyestuff containing chromium and copper from 4-chloro-2-amino-1-phenol (2 mols) \sQ 5 : 5<1>-dioxy-2 : 2<1>-dinaphthylamine-7 : 7<1>-disulphonic acid.  Yellow shades are obtained with the chromium compound from 4 - nitro - 2-amino - 1 - phenol - 6 - sulphonic acid --> acetoacetic acid anilide.  Rose shades are obtained with the chromium compound from nitrated 1 - diazo - 2 - oxynaphthalene - 4 - sulphonic acid and 1-(3<1>-sulphamido)-phenyl - 3 - methyl - 5 - pyrazolone; red shades with the chromium compound from 2-amino-1-phenol-4 : 6-disulphonic acid --> 2 : 4-dioxyquinoline; bordeaux shades with the chromium compound from 4-chloro-2-amino-1-phenol-6-sulphonic acid --> 2 : 4-dioxyquinoline and with the chromium compound from 1 : 8-dioxyanthraquinone-disulphonic acid; brown shades with the chromium compound from 2-amino-1-phenol-4-sulphonic acid --> para-cresol or with the iron compound from 4-chloro-2-amino-1-phenol-6-sulphonic acid --> b -naphthol or with the chromium compound from 1 : 2-dioxy anthraquinone-4-sulphonic acid; violet-brown shades with the chromium compound from 4-nitro-2-amino-1-phenol-6-sulphonic acid --> b -naphthol; violet shades with the chromium compound from 4-chloro-2-amino-1-phenol --> 2-oxynaphthalene-6-sulphonic acid or with the copper compound from 1-amino-2-oxynaphthalene-4-sulphonic acid -->a -naphthol; blue-green shades with the chromium compound from 1 : 4 : 5 : 8-tetra-oxyanthraquinone-sulphonic acid; green shades with the chromium compound from 5-nitro-2-amino-1-phenol --> (acid) 2-naphthylamine-6-sulphonic acid; grey shades with the primary disazo dyestuff containing chromium from 5-nitro-2-amino-1-phenol --> (acid) 2-amino-5-oxynaphthalene-7-sulphonic acid (alkaline) \sM anthranilic acid and black shades with the chromium compound from nitrated 1-diazo-2-oxynaphthalene - 4 - sulphonic acid and b  - naphthol.  Specification 6841/00, [Class 15], is referred to.