| 摘要 |
PURPOSE:To obtain the subject product in a pollution-free process, excellent in dyeability, etc., by coagulating, in a medium with highly dehydrating power, a dope prepared by dissolving cellulose in an aqueous alkaline solution and then by molding the coagulated product. CONSTITUTION:Firstly, a dope >=3wt.% in cellulose concentration is prepared by dissolving an alkali-soluble cellulose having >=100 polymerization degree in an aqueous alkali solution (pref. of sodium hydroxide or lithium hydroxide) at <=16 deg.C (pref. -10 to 10 deg.C). Then, this dope is coagulated in a medium with highly dehydrating power (e.g. sulfuric acid anhydride, polyphosphoric acid) and then molded, thus obtaining the objective cellulose molded product in a pollution-free process. This molded product has mechanical properties comparable to those of existing cellulose molded products and an excellent dyeability because of having such a solid structure that the intermolecular hydrogen bond has been extremely destroyed. |
