US1886995A - Production of dyeings and prints on mixed fabrics - Google Patents

Description

' Patented Nov. 8,1'932 ,UNITED STATES rA'rlazur ,OFFIcEQ HEINRICH WERDENBEBG, or NEU-ALLscHwIL NEAR AsnL, SWITZERLAND, ASSIGNOB TO THE FIRM OF'DURAND & HUGUENIN s. A., or BASEL, SWITZERLAND PRODUCTION OF DYEIINGS AND PRINTS ON MIXED FABRICS i "No Drawing. Application filed March 12, 1931, Serial No. 522,155, mi in Germany March 17,1930.

In U. S. patent application Ser, No. 480,- 027, filed Septemberfi, 1930, a processvfor dyeing cellulose ester fibre with gallocyanine ,dyestuifshas been disclosed. This process 3.. is based on the observation that thesegal- =locyanine dyestuffs have in their leucoform a better aflinity for the said fibre than in the oxidized form. Therefore it is advantageous to bring a leuco compound of a gallocyanine dyestufi' onto the cellulose ester fibre and to develop the dyeingthereon by means of a suitableoxidizing agent. 7

The application of the above mentioned M dyestuff-class on cotton fibre proceeds in a v somewhat different manner as the gallocyanines in the form of the dyestuffs themselves I as Well as in the form of their leuco compounds show an insufiicient aflinity for the 11"bre. To realize the fixation thereon, a gal- I locyanine or'its leuco compound is therefore printed or padded on the fibre together with a chromium salt, whereupon theidesired dyeing is developed as an insoluble chromium I lake by means of steaming.

By these means, however, it is not yet p'ossible to dye or printmixtures of cellulose ester and cottonv in a satisfactory manner. The first mentioned dyeing process is suitable for dyeing the cellulose ester fibre, but the cotton contained in the fabric mixture is dyed quiteinsufiiciently. On the other hand the 5 process with chromium salts, such as it is applied to'cotton, is quite unsuitable for cellulose esters, as the latter fibre possesses only a very slight absorbing property for the chromium lake which is formed.

1 Mixed fabrics, however, containing 40 lulose ester fibre and a cotton fibre, i. e. vegetable cotton or artificial silk being based on a cellulose material such asviscose, coppersilk (Bemberg silk)eetc., are-used actually to a large extent and the dyeing or printing of such fabrics has become an important problem. i It has now been found that it is possible to dye such mixed fabrics evenly with galloeyw anine dyestuffs if one works first in an ancelalogous manner to that described in the aforesaid U. S. patent application for pure cellulose'ester fibre, that is to say if a gallocyanine dyestufi is brought onto the fabric in the form of its leuco compound, if this fibreis.

steamed, whereby the fixationof the dyestuif idized to the dyestufl'. This oxidation and,-

simultaneously the-fixation of the dyestuif on the cotton fibremay be performed by an after-treatment of the fabric in an acid biehromate solution.

in the same Way as in the process of the aforesaid U. S. patent application, also in the present one, simultaneously with the dyestuif a suitable oxidizing agent, inactive in the cold, active in hot state and incapable of causing the formation of a lake with the dyestuif, may be brought onto the fabric. After steaming the dyestutf is fixed and developed on the cellulose ester fibre and by'an after-treatment with a suitable chromium compound the fixation of the dyestuif on the cotton fibre can be performed.

The improved process is illustratedby the following examples. i

The following printing pastes are prepared:

Heat up to dissolve,cool down and add:

I Turpentine oil 20 Sodium chlorate solution (1:3) 80 E wample II Parts Leuco Correine R R (see Colour Index No. 900) Hot water 120 Gum thickening 350 Neutral starch and gum dragon thickening 400 Heat up to dissolve,cool downand add Turpentine oil Sodium chlorate solution (1:3) 80 1000 Emample [II Parts I diethylparaphenylenediamine s e e Colour Index No. 884) Hot water 120 'Gum thickening 350 Neutral starch and gum dragon thickening 400 Turpentine oil 20 Sodium chlorate solution (1: 3) 80 Print these pastes on mixed fabric of acetate silk and cotton, dry, steam for 1 hour,

. treat afterwards at ordinary temperature in a bath containing 5 gr. of bichi'omate of soda per liter of water, and wash. Thus one obtains evenly developed and normal dyeings on both kinds of fibres.

In these cases instead of bichromate'in an analo ous manner another chromium com pound such as for instance chromium acetate may be used with a similar result.

Example V Parts Prune (see Colour Index No. 893 30 Hot water 342 'Hydrosulphite NF conc. (powder) 8 -Heat up until completely reduced,

then add: Neutral starch and gum dragon thickening; 600 Cool down and add: Turpentine oil 20 'Print on mixed fabric, steam for 40 minutes. After steaming treat in a bath containing 10 gr. of sodium bichromate and 10 com.- of formic acid (85 per cent) per liter for 10 to 15 minutes, rinse and soap.

When using a printing paste which contains a chromium salt, such as for instance chromium acetate, only uneven and dull shades are obtained, as in this (latter) case the acetate silk fibre is dyed only very slightly.

By the present process, dyeings on mixed fabrics may also be produced by padding.

In this process the gallocyanine dyestuffs may also be used inmixtures with dyestuffs of other classes capable of being absorbed by the cellulose fibre and of being fixed on cotton fibre as a chromium lake such as for instance yellow wood extract.

What I claim is 1. A. process for producing dyeings and prints on mixed fabrics containing cellulose ester fibre and a cotton fibre by means of gallocyanine dyestufis, which consists in bringing a gallocyanine dyestuif in form of its leuco compound onto the fabric, subjecting the same to a steaming operation, necessary for the fixation of the dyestuff on the cellulose ester fibre, and then after-treating the fabric with a suitable chromium compound to produce fixation of the dyestuff on the cotton 2. A process for producing dyeings and prints on mixed fabrics containing cellulose I ester fibre and a cotton fibre by means of 'of'the dyestufi on the cotton fibre.

3. A process for producing :dyeings and prints on mixed fabrics containing cellulose ester fibre and a cotton fibre by means of gallocyanine dyestufis, which consists in bringing onto the fabric a gallocyanine dyestuff in form of its leuco compound simultaneously with an oxidizing agent, which is inactive in the cold, but becomes active to perform the necessary oxidizing action in hot state, subjecting the fabric to a steaming operation for thefixation of the dyestuff on the cellulose ester fibre and then after-treating same with a suitable chromium compound to produce the fixation of the dyestuif on the cotton fibre.

In witness whereof I have hereunto signed myname this 2nd day of March 1931.

HEINRICH WERDENBERG.