Patent GB-144204-A (GB)
Title: Process for the treatment of vegetable fibres
IPC: D01C1/02
Filed: 1919-12-12
Abstract: Vegetable fibres of all kinds, whether in the mass or in the form of lap, yarn, or fabrics made therefrom, are given the character of wool and an increased affinity and absorbent capacity as regards basic and other dyestuffs by precipitation thereon of products resulting from the action of concentrated nitric acid upon starch or other amylaceous substance, the precipitation being effected either by washing with water or by treating with dilute solutions of acids, bases, or salts followed by washing with water.  The fibres may be impregnated with the solution of starch &c. in concentrated nitric acid, the excess being pressed out and the nitrated amylaceous substance precipitated upon the fibres by washing, or the fibres are impregnated with a paste or aqueous solution of starch &c., dried, passed into concentrated nitric acid, and the nitrated amylaceous substance precipitated upon the fibres by washing.  In an example of treatment, a paste is prepared by heating together 40 kilos of maize starch and 75 litres each of water and acetic acid.  The textile is dressed with the paste, dried, treated for three to five minutes with 72 per cent nitric acid at a temperature of 15-20 DEG  C., the excess of acid is pressed out, and the material is passed through a 10 per cent solution of sodium bisulphate, and washed with water. Specification 136,568, [Class 42 (i), Fabrics, Finishing &c.], is referred to.ALSO:Vegetable fibres are given the character of wool and an increased affinity and absorbent capacity as regards basic and other dyestuffs by precipitation thereon of products resulting from the action of concentrated nitric acid upon starch or other amylaceous substance, the precipitation being effected either by washing with water or by treating with dilute solutions of acids, bases, or salts followed by washing with water.  The fibres may be impregnated with the solution of starch &c. in concentrated nitric acid, the excess being pressed out, and the nitrated amylaceous substance precipitated upon the fibres by washing, or the fibres are impregnated with a paste of aqueous solution of starch &c. dried, passed into concentrated nitric acid, and the nitrated amylaceous substance precipitated upon the fibres by washing.ALSO:Vegetable fibres of all kinds, whether in the mass or in the form of lap, yarn, or fabrics made therefrom, are given the character of wool and an increased affinity and absorbent capacity as regards basic and other dyestuffs by precipitation thereon of products resulting from the action of concentrated nitric acid upon starch or other amylaceous substance, the precipitation being effected either by washing with water or by treating with dilute solutions of acids, bases, or salts followed by washing with water.  The fibres may be impregnated with the solution of starch &c. in concentrated nitric acid, the excess being pressed out and the nitrated amylaceous substance precipitated upon the fibres by washing, or the fibres are impregnated with a paste or aqueous solution of starch &c., dried, passed into concentrated nitric acid, and the nitrated amylaceous substance precipitated upon the fibres by washing.  In an example of treatment, a paste is prepared by heating together 40 kilos, of maize starch and 75 litres each of water and acetic acid.  The textile is dressed with the paste, dried, treated for three to five minutes with 72 per cent nitric acid at a temperature of 15 DEG -20 DEG  C., the excess of acid is pressed out, and the material is passed through a 10 per cent solution of sodium bisulphate, and washed with water. Specification 136,568 is referred to.