GB291473A - Improved cellulosic materials and the production thereof - Google Patents

Abstract

291,473. Tootal Broadhurst Lee, Co., Ltd., Foulds, R. P., Marsh, J. T., Wood, F. C., Boffey, H., and Tankard, J. Dec. 1, 1926. Yarns, treating with liquids.-Textile materials such as yarns and fabrics of cotton, silk, ramie, jute, hemp, artificial silk, acetyl silk, and linen are rendered less susceptible to creasing or crushing while retaining their original suppleness by impregnating them with the components of a synthetic resin and effecting the condensation within the material. In an example, a plain cotton fabric, preferably mercerized with or without tension, is impregnated with a mixture of formaldehyde, urea, boric acid, and water. It is then squeezed and dried at 130‹ C., the excess reagents being removed by a soap boil. The intermediate resin may be employed for impregnating the fabric. Alkaline catalysts such as potassium carbonate, sodium bicarbonate, &c. may be used instead of boric acid. Alkaline catalysts may be employed for the intermediate condensation product, an acid catalyst being employed to effect the final condensation. When phenol-formaldehyde resin is employed, alkaline catalysts may be employed for effecting the intermediate and final condensations, and reducing-agents such as formaldehyde sulphoxylate compounds may be used to prevent development of colour on drying and/or exposure to air and light. In another example, a mixture of acetonephenol condensation product (dihydroxydiphenyl dimethyl methane) and formaldehyde are condensed in the presence of caustic potash by boiling in a reflux condenser. The mixture is then cooled and diluted, for example with formaldehyde and water, and employed for impregnating the fabric. After passing the fabric through rollers to remove the surface liquor, it is heated to 160-180‹ C. to complete the treatment. Specifications 258,357, and 291,474, [Class 42 (i), Fabrics, Finishing &c.], are referred to.