US1835920A - Process for loading or impregnating silk and silk-tissue - Google Patents

Description

Patented Dec. 8, 1931 UNITED STATES MARKUS WERDER, OF IRIEDLINGEN-LEOPOLDSHOHE IN BADEN, GERMANY miocnss For; LOADING on mrane'na'rme SILK am) SILK-TISSUE No Drawing.- 4pplication filed July 9, 199 8, Serial No. 281,488, and in Germany Kay 8, 1928.

For the purpose of charging or loading silk and silk-tissues it is known to treat the same several times in succession with a solution containing chiefly stannic tetrachloride,

6 the so-called pink-bath, and subsequently with a solution containing mainly secondary phosphate of sodium or di-sodium phosphate.

Immediately upon having been treated with stannic tetra-chloride as above stated the material is subjected to-a thorough and exhaustive washing and cleaning process.

account of the repeated treatments with solutions of tin-tetrachloride, a great part of which is washed in the washing water and 5 can only be recovered by very expansive processes. A further objection resides in the fact, that the exhaustive. washing process, to which the material is subjected immediately after the treatment with tin-chloride-bath,

3 involves considerable cost.

The object of my invention is to remedy these defects. With this object in view I first treat the silk material. with a solution of tin-tetrachloride as usual and immediately thereupon, after having removed the excessive stannic chloride from the wet material by shaking or squeezing, I subject the latter to the action of an acid solution of ammonium phosphate, preferably mono-ammonium phosphate. 1

In proceeding in this manner I surprisingly found that it is possible to attain in this way a comparatively high loading result or in other words to ensure any desired loading effect by way of a less number of tin and phosphate treatments than hitherto required for obtaining the same effect. It will be seen that a marked economy of work, time and chemicals is secured thereby and besides that 9 a further considerable economical advantage resides in the fact that the expensiverecovery of tin salts from the washing water is (llS-t pensed w th; another advantage of the invent1on hes in the fact that there is no necessity of employing protective colloids, which must it! be used with the known methods. Separatlons or precipitations in the final product do not occur; gloss and all of the other valuable properties of the silk are fully preserved therein.

The concentration of the tin-bath is preferably between 24and 30 B., while the acid phosphate bath or solution preferably contams 10 to 12 percent of mono-ammonium phosphate and may be applied in a cold state.

In connection with the improved process above outlined in general, the silk material 1s SllbJGCtGd to a subsequent treatment with (ii-sodium phosphate, which is known in itself, contamlng about 12 to 16 percent and at a temperature of about to C.

If desired the method according to the present invention may be combined with any other known loading methods. The d1- sodlum-phosphate may be replaced by soda ust 1n accordance with the loadingde ee desired to be attained in the final pro not and it goes wlthout mentioning that the method may be combined with the usual final step of treatmg the product with waterglass or even with a solution or bath of sulphate of aluminium previous to such waterglass treatment. 7

I shall-now proceed to describe the successive step of my invention more in detail by way of a few specific examples.

Ewample 1,-v-A. tintetrachloride-bath of 28 B.,

Shaking or squeezing of the material,

A cold mono-ammonium phosphate bath containing 12 percent of monorammonium phosphate and 1 percent of phosphoric acid,

A di-sodium-phosphate bath containing 15 percent of di-sodium phosphate and heated to a temperature of 60 C.,

Simple washing and shakingof the treated material under treatment.

Ewample .'Z.A tintetrachloride-bath of Shaking or squeezing of the material under treatment,

A cold bath containing 12 percent monoammonium phosphate,

A (ii-sodium phosphate-bath containing 15 percent of di-sodium phosphate and heated. to a temperature of 60 0., i

Washing and shaking of the treated material.

Example 3.The steps as in Example 1 or Example 2 and subsequently A bath of waterglass of'the usual tration of about 50 B.,

Washing and shaking, soaping, dyeing.

concen- 5 A loading efiect of 80-40% is obtained by this treatment. If it is desired to have a loading effect, for instance, of 85 to 95% the described treatments must be repeated three times.

What I claim is:

1. A process of impre tissues with chemical su stances for the pur pose of increasing the weight thereof, con- 7 si'sting in first treating thematerial in the usual manner with a tinchloride solution and immediately thereafter with an acid solution of ammonium phosphate;

- 2; A process of impregnating silk and silk tissues with chemical substances for the purpose of increasing the weight thereof, consisting in first applying the usual treatment with a tinchloride solution and immediately thereafter treating the material with a solution of mono-ammonium phosphate.

3. A process of impregnating silk and silktissues with chemical substances for the purpose of increasing the weight thereof consisting in first treatin the material with the usual tinchlorideath and thereupon treating the material with an acid solution of ammonium phosphate and finally removing excessive liquid therefrom.

4. A process of treating silk and silk-tissues with chemical substances for the purpose of increasing the weight thereof which comprises first treating the silk material with a solution of stannic chloride, then removing excessive 1i uid therefrom by shaking and squeezing, t ereupon treating the still Wet material withan acid solution of ammonium phosphate and finally treating the same with a solution of di-sodium-phosphate.

In testimony whereof I aflix my signature. DR. MARKUS WERDER.

asaeao ating silk and silk-