US1824671A - Treatment of cotton and artificial silk - Google Patents

Description

Patented Sept. 22, 1931 UNITED STATES PATENT QFFICE PAUL KABRER, OF ZURICH, AND WALTER WEHRLI, OF BINNINGEN, NEAR BASEL, SWITZERLAND, ASSIGNORS TO THE FIRM OF CHEMICAL WORKS FORMERLY SA NDOZ,

OF BASEL, SWITZERLAND TREATMENT OF COTTON AND ARTIFICIAL SILK No Drawing. Application filed January 20, 1928, Serial No.248,269, and in Germany January 28, 1927.

It has been found, that if cotton or artificial silk fibres (viscose, cuproammonium and nitrocellulose silk) are simultaneously treated at elevated temperatures with a halide (chloride or bromide) of any of the aliphatic oraromatic sulphonic acids (for instance toluene-, benzene-, benzylor ethylsulphonic acid chloride) and a tertiary, alihatic, aromatic or heterocyclic organic ase, like triethylamine, dimethylaniline, pyridine, its homologues, quinoline and like substances, improved fibres can be obtained, which contrary to the original ones, show a good affinity for acid dyestuffs and yield fast shades. The process can also be carried out by treating the above mentioned fibres with the products of reaction of the above mentioned acid halides with tertiary organic bases. The reaction may be carried out at lower or higher temperatures (for instance at 70 C. up to 110 0.). The new effect is very surprising. According to the process of the United States Letters Patent No. 1,523,742, fibres may be obtained by the interaction of alkalized cotton and aromatic sulphonic acid chlorides, which are refractory against direct cotton dyes and-which.

are only dyedby certain acid colors, As against this the improved process allows to produce fibres which can be dyed by acid colors quite generally.

The following examples illustrate the improved process, the parts being by weight.

Example 1.3.7 parts of cotton are treated in a convenient closed vessel with 7.4 parts of benzene-sulphonic chloride and 40 parts of pyridine. The temperature is kept during one hour and a half at 110 C. The yarn is then washed with water and can be dyed after this treatment with acid colors in fast and level shades.

The duration of the interaction may also be diminished for instance to one hour and the pyridine may be replaced by a mixture of pyridine homologues, quinoline or triethylamine.

Example 2. 3.9 parts of mercerized cotton are heated at 110 C. for three hours with a mixture of 7.8 parts of p-toluene-sulphonic chloride, 10 parts of pyridine and 20 parts of nitrobenzene. The yarn then washed and dried shows the mercerization lustre unaltered and can easily be dyed with acid colors. In this example, the nitrobenzene can be replaced by another indifferent organic solvent having the desired dissolving properties, such as carbon tetrachloride for example.

Ewample 3.5.7 parts of viscose silk (or ammoniumcuproxide silk or nitrocellulose silk) are immersed into a mixture of 11 parts of p-toluene-sulphonic chloride and 35 parts of pyridine. The yarn is then kept a quarter of an hour at ordinary temperature and the mixture is then heated at 110 C. for half an hour. The washed and dried viscose silk thus treated returns its lustre fully, but contrary to the untreated fibre,

it can be dyed with acid colors of any kind,

such as for example lanafuchsine 6B (color index No. 54), acid violet GBS (color index No. 717), patent blue A (color index No. 714) and naphthalene green V (color index No. 735), in level and fast shades. In this example, the reaction may also be carried out in presence of an indifferent organic solvent, such as nitrobenzene or carbon tetrachloride. Furthermore the fibres as well as the reacting compounds are advantageously water-free.

at we claim is:

1. A process for rendering cotton and regenerated cellulose fibres capable of being dyed byacid colors, consisting in treating these fibres simultaneously with an aromatic sulphonic chloride and a tertiary .organic base.

2. A process for rendering cotton and regenerated cellulose fibres capable of being dyed by acid colors, consisting in treating these fibres simultaneously with an aromatic sulphonic chloride and a tertiary organic base in presence of an inert organic solvent. 7

3. A process for rendering cotton and re-- generated cellulose fibres capable of being dyed by acid colors, consisting in treating these fibres simultaneously with an aromatic sulphonic chloride of the benzene series and a tertiary organic base in presence of an inert organic solvent.

4. A process for rendering cotton and regenerated cellulose fibres capable of being dyed by acid colors, consisting in treating these fibres simultaneously with an aromatic sulphonic chloride of the benzene, series and a heterocyclic tertiary organic base in presence of an inert organic solvent.

5. A process for rendering cotton and regenerated cellulose fibres capable of being dyed b acid colors, consisting in treating these fi res simultaneously with an aromatic sulphonic chloride of the benzene series and.

15. pyridine in presence of an inert organic solvent.

6. A process for rendering cotton and renerated cellulose fibres capable of being yed by acid colors, consistlng in treating these fibres simultaneously with p-toluenesulphonic chloride and pyridine in presence of an inert organic solvent.

7 A process for rendering viscose silk capable of being dyed by acid colors, consisting in treating these fibres simultaneously with p-toluenesulphonic chloride and pyridine in presence of an inert organic solvent.

In witness whereof we have hereunto signed our names this 5th day of January,

PAUL KARRER. WALTER WEHRLI.