US1860473A - Compositions consisting of woolen fibers and artificial threads - Google Patents

Description

Patented May 31, 1932 UNITED STATES PATENT OFFICE ALBERT MOHRING AND GUIDO SCEULTZE, OF ELBEIRFELD, AND PAUL SCHLACK, OF

BEBLIN-KABLSHORST, GERMANY, ASSIGNORS TO I. G. FARBENIND'USTRIE .AKTIEN- GESELLSCHAFT, OF FRANKFORT-ON-THE-MAIN, GERMANY, A. CORPORATION OF GERMANY COMPOSITION$ CONSISTING OF WOODEN FIBERS AND ARTIFICIAL THREADS No Drawing. Application filed September 21, 1929, Serial No. 394,380, and in Germany September 22, 1928.

The present invention relates to mixed textile goods containing woolen fibers and such artificial threads as are derived from a mixedcellulose ester of nitric acid and a lower fatty acid, such as cellulosenitroformate,

cellulosenitroacetate and cellulosenitropropionate.

The term mixed textile goods is intended to include yarns as well as tissues.

Mixed textile goods from woolen fibers and artificial threads prepared from uniform cellulose esters, especially cellulose acetate, cannot be dyed under the same conditions as pure wool, because the artificial cellulose ester threads lose their luster at temperatures ofv over 80 C. and especially at boiling temperature; they also curl and have their volume increased, so that their properties finally i'esemble those of wool. Then, besides losing their silky character, the cellulose esters in this state do not sufiiciently resist wool-dyestuffs, and therefore, on dyeing the mixed goods the multicolored effects intended do not come out correctly. All these disadvan- 2 tages are overcome by using instead of a uniform cellulose ester a mixed cellulose ester of the kind referred to above. The fiber mixtures thus prepared can be dyed in the usual manner and can be washed at a boil- 3 ing temperature without the mixed cellulose esters losing their luster; moreover, these artificial threads have an excellent resisting power, and furthermore it is possible to submit such woolen fibers containing mixed cellulose esters to a carbonizing process, for example with an aluminum chloride solution of 7 B. at 95 0., whereby vegetable constituents are removed without unfavorably influencing the artificial threads.

ing examples, without being limited there- Example 1.-Mixed textile goods may con sist of 7 0 parts by weight of wool and 30 parts by weight of artificial fibers, the latter having The invention is illustrated b the follow- 1 been prepared from nitro acetate cellulose,

which contains about 12% of nitrogen and about 54% of acetic acid. If the artificial fiber is dyed as constituent of a carded yarn, prepared from the above described mixture, with a dyestufi fast to overdyeing, the wool constituents may be dyed afterwards under the usual conditions. Then the material may be carbonized with a lye of aluminum chloride of about 7 B. at a temperature of about 95 (3., in order to remove the vegetable constituents. Thereby the artificial fiber is not attacked.

Eaample .2. grams of a woolen tissue containing effect threads of nitro acetate cellulose, containing 1, 3% nitrogen, said efiectthreads being intended to give the multicolored elfect to the mixed goods are introduced into a dyeing bath of about 0. containing in a litre 1.25 grams of azogrenadine S (compare Color Index 1924:, page 13 Nr. 54), 10 grams of Glaubers salt calcined and 1,5 grams of sulfuric acid. The temperature is slowly raised to boiling and dyeing is effected for one hour. Then the tissue is washed rinsed and dried. The woolen fibers are dyed a clear red while the nitro acetate cellulose fibers remain pure white and of a silky luster.

The nitrogen content of the mixed esters of cellulose used for the purpose of the invention may vary within the widest limits, but generally we use esters having a nitrogen content of about 0.5 to 2%. These esters are obtainable by the usual methods, for example by acidylating according to known processes a nitro cellulose, having a low nitrogen content, according to the method described in German Patent 295,889, or by acidylating the cellulose in the presence of concentrated nitric acid, the quantity of the nitric acid depending on the desired nitrogen content of the mixed ester to. be prepared, say in the presence of about 3 to 10% nitric acid calculated on the amount of the cellulose.

We claim 1. As new articles of manufacture mixed textile goods composed of woolen fibers and artificial threads prepared from a mixed cellulose ester of nitric acid and a lower fatty acid being fast to boiling.

2. As new articles of manufacture mixed textile goods composed of woolen fibers and artificial threads prepared from a mixed cellulose ester of nitric acid and a fatty acid of the group consisting of formic acid, acetic acid and propionic acid being fast to boiling.

'3. As new articles of manufacture Woolen tissues provided with effect threads pre-' pared from cellulose nitro acetate, said effect threads being fast to boiling.

In testimony whereof, we afiix our signatures.

ALBERT MoI-IRING. [14.8.] GUIDO SOHULTZE. [1,. s.] PAUL SCHLACK. [11. 5.]