US1908993A - Process for dyeing cellulose acetate silk - Google Patents

Description

Patented May 16, 1933 UNITED. STAT WARE ES PATENT OFFICE RICHARD METZGEB, OF HEIDELBERG, GERMANY, ASSIGNOB, BY MESNE ASSIGNMENTS; TO GENEBA}; ANILINE WORKS, INC., OF NEW YORK, N. Y., A CORPORATION OF DELA- rnocnss FOR DYEING GELLULOSE ACETATE Sm:

No Drawing. Application filed July 7, 1925, Serial No. 42,046,41141 in Germany July 11, 192;.

The present invention has for its object to provide for an improved process for dyeing cellulose acetate silk.

I have found that cellulose acetate silkcan be dyed in a very excellent and improved manner with a great number of insoluble or difiicultly soluble compounds when dyeing is carried out in the presence of su'lfite cellulose waste liquor.

The compounds dyed with the aid of the aforesaid sulfite cellulose waste liquor may be coloring matters or colored or anic compounds in general, insoluble or di cultly soluble in water, as well as components of dyestufi's, such for example as amino compounds which afterwards are diazotized on the fibre and. coupled with suitable components, or naphthols or similar components which afterwards are to be developed with diazo compounds. s

For dyeing, the compounds to be brought on the fibre may be first made into a concentrated solution or paste, generally of a colloidal nature, or otherwise finely dispersed in a concentrated form by an addition of sulfite cellulose waste liquor either alone or in association with one or more of the so-called synthetic tans, such as substances of the nature of phenol- (or cresol-) formaldehyde-sulfuric acid condensation products, or phenolsulfonic acid-sulfur condensation products, carbazol sulfonic acids, crude anthracene or other high tar hydrocarbons sulfonic acids,

or sulfonated mineral oils and the like, and

a dye-bath prepared by diluting such concentrated preparation,or the dyebath may be directly prepared with the compounds to be brought on the fibre while adding sulfite cellulose waste liquor either alone or with the of ordinary temperature. 100 parts of acetate silk are dyed in the bath for one hour at the said temperature, rinsed and dried, handsome golden yellow shades being obtained.

As examples of coloring matters dilficultly soluble in water which may be employed for dyeingcellulose acetate silk in the manner hereinbefore described may be mentioned, for instance the condensation product of 3-chlor- (i-nitro-l-amino-benzene and formaldehyde (sec U. S. Patent 932,266, dated August 22, 1909), 1.4-diamino-anthraquinone, 1.4.5.8- tetra-amino-anthraquinone, 3-aminobenzanthrone, .Bz l-aminobenzanthrone correspond ing to the formula alpha naphthylamine (diaz) +meta-phenylene-diamine, beta amino-alpha-naphthraqum one, 8-nitro-2-amino-naphthalene, -nitro-1.4- diaminoanthraquinone, methyl violet base, alpha naphthylamine (diaz) para-hydroxybcnzoic acid.

WVhat I claim is:

1. The herein described process for the production of tints on acetyl cellulose, which comprises treating the acetyl cellulose with a colloidal preparation from an intermixture of insoluble amino-azo-dyestufi's having an affinity for acetyl cellulose with waste sulfite li uor. J

2. The herein described process for the production of tints on acetyl cellulose, which addition of a sulfonic a d the comprises treating the acetyl cellulose with character.

The following example will serve to further illustrate my present invention which however is not restricted thereto. The parts are by weight.

Example 2 parts of 8-nitro-2-amino naphthalene are Well mixed with parts of concentrated sul fite cellulose waste liquor of between and and passed into 2000 parts of water a colloidal preparation from an inter'mixture of aminoanthraquinones having an aifinity for acetyl cellulose with waste sulfite liquor.

3. The process of producing dyeings on cellulose acetate silk which comprises employing a substance suitable for dyeing acetate silk difficulty soluble in water, the -said substance containing in its molecule at least one aromatic nucleus and at least one nitrogen atom 'which is fixed to an aromatic nucleus and otherwise connected with atoms of elements selected from the roup consisting of carbon, nitrogen and ydrogen, in conjunction with sulphite cellulose waste liquor.

' 4. The process of producing'dyeings on' cellulose acetate silk which comprises n1ploying a substance suitable for dyeing acetate 4 silk, difliculty soluble in watcrselected from the group consisting of ainino-azo-ilyestufi's and ainino-anthraquinones in conjunction with sulpliite cellulose waste liquor.

In testimony whereof I have hereunto set my hand. 1

RICHARD METZGER.