| 摘要 |
551,923. Artificial filaments, films &c. THOMSON, R. H. K., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. Sept. 12, 1941. No. 11685. [Class 2 (ii)] - Artificial filaments, films and like thin materials made by coagulating protein solutions are desiccated, heated to about 85-120‹C. and then re-humidified, whereby the physical properties of the materials are improved. The desiccation and the subsequent heat-treatment may be a single operation and may be effected at 100‹C. for 4-8 hours or at 120‹C. for 3-4 hours. In an example, a solution of pea-nut protein in aqueous caustic soda is extruded in fibre form into an acid coagulating bath, and the fibres are treated successively with a concentrated solution of common salt and a solution containing common salt, sulphuric acid and formaldehyde ; after drying at 30‹C., the fibres are exposed for 4 hours to a temperature of 100‹C. and then for 16 hours to an atmosphere of 50 per cent. humidity at atmospheric temperature. Specifications 513,910 and 643,586 are referred to. |
