BE426892A - - Google Patents

Description

       

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  "PROCESS FOR EEDUIBE THERE TENI> ANC1iI TO THE EEIME8TATION OF THE ARTIFICIAL FIBERS OBTAINED FROM THE, CASEIN
It is known that the man-made fibers which can be obtained from casein are easily subject to fermentation, when present. the state wet *.



   In addition, the fiber that has. summer boiled is much more putrefiable than one which has been simply wet with cold or lukewarm water.



   The presence of mineral, or even organic, acids during boiling, further worsens the condition of the fiber and promotes the fermentation process, causing the formation of

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 molds.



   As a result, the ordinary dyeing process using acid and chromium dyes, the application of which involves prolonged boiling in an acidic medium, is particularly detrimental to the fiber, since it makes it extremely putrefiable. The same phenomenon; occurs, to a lesser extent, when dyeing is carried out with acidic or direct dyes at 70-8000., in a slightly acidic or neutral medium, while dyeing with basic dyes, which is usually carried out at low temperature (About 30 C.) is the least harmful to the. fiber.



   It has now been found that by treating the unbleached or dyed fiber; in an aqueous solution of the alkali salts of toluena-chloro "sulfonamides, the process of fermentation and mold formation is considerably inhibited. * Even the fiber dyed with acid and chroma dyes, which has therefore undergone a long boiling in a Acidic medium is no longer putrefiable when it has been subsequently treated in said solution, even if it is left to itself, in the wet state, for more than a month.



   We can speak of a real specific action, since ordinary antiseptics and anti-ferments are almost ineffective.



   The great importance of this invention in the dyeing of casein fibers and the like is therefore evident, since the dyeing can thus be carried out without encountering the disadvantages which have heretofore been unavoidable.



   The treatment according to the invention can also be applied to mixed fibers.



   EXAMPLE 1 - the fiber obtained from casein is dyed with 2% alizarin blue black B in the usual way, namely,

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 it is treated for about 90 minutes at boiling point and is then chromated. The washed fiber is immersed for about 15 minutes, at ordinary or lukewarm temperature (3000. approx.), In a solution containing 2-3 gr. sodium salt
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 ortho- or para-toluene-chloro-aulfanamide.



   EXAMPLE 2 - The fiber obtained from casein is dyed with 3% tibia scarlet. 4BS at 70 ° C. for approximately 60 minutes. The washed fiber is immersed, as in Example 1, in a solution containing 1-2 g per liter. sodium ortho- or para-
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 toluene-chloro-sulfanamide.



   EXAMPLE 3 - Ia easâine fiber, mixed in equal parts with. wool, is dyed: with: 3% fuller's red solid G for 40-50 minutes at. 90-95 C., in a slightly acetic medium. The washed fiber is immersed, as in Example 1, in a solution containing 1.5 g per liter. sodium salt
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 ortho- or para-toluèr.-chlorc-sulfonamide.


    

Claims (1)

ABSTRACT. 1 - Process for reducing the tendency to fermentation of the artificial fibers obtained from casein, characterized in that the fiber is treated in an aqueous solution of an antiseptic substance. 2 - Process according to 1, characterized in that the fiber is treated in an aqueous solution of alkali salts of toluene-chloro-sulfonamides. 3 - Process according to 1 and 2, characterized in that the fiber is treated in the unbleached state. 4 - Process according to 1 and 2, characterized in that the fiber is treated in the dyed state.