| 摘要 |
Cellulose esters such as cellulose acetate, formate, propionate, or butyrate, or mixed esters, or ether-esters, are subjected to saponification treatment with an alkaline salt of an organic base. The cellulose ester may be in the form of filaments or films. The organic base may be mono-, di-, or trimethylamine or ethylamine, or propylamine, ethylene diamine, mono- or dimethyl ethylene diamine, propylene diamine, triamino propane, triethanolamine, tetra-methyl or ethyl ammonium hydroxide, a g - diamine - b - propanol, amylamine, hexylamine, piperidine, or cyclo-hexylamine. The salt may be a carbonate, silicate, or phosphate. Instead of the carbonates, the corresponding substituted carbaminic acids may be used. The saponifying medium may contain a proportion of free organic base in addition to the salt. Small amounts of caustic soda or other mineral alkali and accelerating agents such as copper, zinc, silver, or nickel, or oxides or salts of these metals, may also be present. The saponifying agent may be in aqueous or alcoholic solution. Swelling agents may be present. Filaments may be shrunk or stretched before, during, or after saponification. They may be treated with soaps, sulphonic acids or other wetting agents. The filaments may be saponified in hank form, or while travelling as single threads or as a warp. The treatment may be by bath or padding methods, and the filaments may pass through a heated zone. Saponification may be partial or complete. In examples, cellulose acetate threads are passed in warp formation through baths containing methylamine silicate, methylamine carbonate, or trimonomethylaminephosphate, and free methylamine. The treatment may be carried out under pressure. Specifications 316,521, 318,468, [both in Class 2 (ii)], 380,504, 380,505, 389,823, 430,351, 435,806, and 443,707 are referred to.
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