Verfahren zur Herstellung von alkalilöslichem Celluloseacetat-Textilmaterial

Alkali soluble cellulose acetate textile material that is at least 90% soluble in an alkaline solution at room temperature, but possesses the necessary physical properties for effective use as textile fibre, yarn or fabric and may be dissolved and easily removed from textile material containing this treated cellulose acetate as one component and other textile components that are not alkali soluble, is made by treating non-alkali soluble cellulose acetate textile material with a composition comprising (1) either chromic acid or a dichromate salt in combination with (2) either a mineral acid or certain organic acids, e.g. oxalic acid, for sufficient length of time to render the cellulose acetate material soluble in alkali, washing the material free of the treating chemical and drying the material. The treated material is preferably substantially completely soluble in 0.01% to 3.0% sodium hydroxide. The alkali soluble property may be obtained by treating the cellulose acetate textile material with a dichromate and a mineral acid; e.g. sodium dichromate of 0.7 to 4.0% concentration and nitric acid of approximately 1.0 to 18% by weight concentration. Alternatively the alkali soluble property may be obtained by treating the cellulose acetate material with chromic acid and oxalic acid. In an example a cellulose acetate cloth is treated for 60 minutes at 170 DEG F. at a liquid to fibre ratio of 20:1 with a solution containing 0.8% sodium dichromate expressed as the dihydrate, and 2.4% nitric acid expressed as 100% nitric acid.ALSO:Alkali soluble cellulose acetate textile material that is at least 90% soluble in an alkaline solution at room temperature, but possesses the necessary physical properties for effective use as textile fibre, yarn or fabric and may be dissolved and easily removed from textile material containing this treated cellulose acetate as one component and other textile components that are not alkali soluble, is made by treating non-alkali soluble cellulose acetate textile material with a composition comprising (1) either chromic acid or a dichromate salt in combination with (2) either a mineral acid or certain organic acids e.g. oxalic acid for sufficient length of time to render the cellulose acetate material soluble in alkali washing the material free of the treating chemical and drying the material. The treated material is preferably substantially completely soluble in 0.01% to 3.0% sodium hydroxide. The alkali soluble property may be obtained