PL29439B3 - A method of producing waterproof cellulose fibers. - Google Patents

Description

The longest term of the patent until August 30, 1954. Patent No. 29077 describes a method of making waterproof cellulose fibers, according to which these fibers are infused with compounds containing at least one aliphatic or cycloaliphatic residue made of at least one Less than four carbon atoms which can react with aldehydes, and then the fibers thus treated are treated simultaneously or subsequently with aliphatic aldehydes. As compounds to react with aldehydes, the following may be used: fatty amines or fatty acid amines, such as dodecylamine, hexadecylamine, octadecylamine, octadecenylamine, abietic acid amine, lauric acid amine, sterioybutyliomethyl- or i-amine. loamine, stearoylooctadecylamine or ureas, substituted with alkyls, for example monisobutyl urea, monododecyl urea, monooctadecyl urea, stearoyl urea or also imine ethers or fatty acid amidines. In addition to the above-mentioned compounds, phenol derivatives can also be used, for example, dodecyl phenol, diisohexyl phenol. Instead of the products mentioned, their transformation products with aliphatic aldehydes, for example their methylol compounds, can be used. In the case of using these products, it becomes superfluous in various cases to subsequently treat with formaldehyde, and then only additional heating is sufficient. The present invention relates to the further development and improvement of said process. According to the invention, the abovementioned compounds, as such or as their condensation products with aldehydes, are added to pre-limiting solutions for the production of cellulose fibers. The fibers produced from these solutions can optionally be additionally treated with aliphatic aldehydes in order to increase the hydrophobic effect. The method can be carried out, for example, by adding the above-mentioned bodies or their condensation products to the pre-limiting solution. with the aldehydes in the form of as fine a dispersion, this dispersion can be achieved by suitable pretreatment in a homogenizing machine or by the use of suitable emulsifiers. The pre-solution will pass to a Muller bath, that is, an acid bath containing sulfuric acid and sodium sulfate, or it will pass through the method known in the art where two pre-treatment baths are used. The fibers produced in this way are, if appropriate, subjected to the action of aldehydes after drying. Such treatment with aldehydes becomes superfluous when the condensation products of the described compounds with the aldehydes have already been added to the pre-quenching solution. After drying, the fibers are subjected to additional heating, most preferably in an acidic environment. Supplementary heating may be effected, for example, at a temperature of 110 °. As an acidic medium, for example, acetic acid, lactic acid and similar acids can serve. Example I. To 5 kg of a viscose solution containing 7.5% cellulose and 6.5% NaOH, 250 cm3 of a 10% methylolamine emulsion are added stearic acid. This solution will pass in the usual manner to the Muller bath. The fibers thus obtained are treated in a wet or dried state with a 1% solution of lactic acid, dried at 50-60 ° and allowed to mature for an hour at 110 °. Example II. 250 g of a 10% strength emulsion of stearic acid amide are added to a 5 kg solution of viscose containing 7.5% cellulose and 6.5% NaOH. The fibers, separated from this muller bath solution, are treated with a 30% solution of tartar formaldehyde and dried or treated with formaldehyde vapors for 10 hours and dried at 110 °. Example III. The fibers are initially prepared and processed as described in Example II. The dried fibers are then treated with a 1% solution of lactic acid and then matured for 1 hour. PL

Claims (3)

Patent claims. 1. A method for the production of waterproof cellulose fibers according to Patent No. 29077, characterized in that the compounds used according to Patent No. 29077 contain at least one aliphatic or cycloaliphatic residue with at least 4 carbon atoms and capable of reacting with alum. with dehydrates, it is incorporated into the pre-melting solution, the fibers made of it are treated with aldehydes and then given to additional heating. - 2 - 2. The method according to claim The process of claim 1, characterized in that the condensation products of the products with aliphatic aldehydes mentioned in Patent No. 29077 are incorporated into the pre-limiting solution and the fibers produced are additionally heated. 3. The method according to p. 1 and 2, characterized in that the auxiliary heating is effective in an acidic environment. I. G. Farbenindustrie Aktiengesellschaft. Deputy: M. Skrzypkowski, patent attorney. DRUK y AKCT CZERNIAKOWSKA ?? b PL