| 摘要 |
PROBLEM TO BE SOLVED: To provide a formed material containing cellulose and casein and having biodegradability of regenerated cellulose and excellent mechanical properties and to provide its production process. SOLUTION: This formed material has a casein content of 3-15wt.% based on the callulose and a dynamic viscoelasticity characterized by the formula,ΔTmaxα<=40 deg.C, whereinΔTmaxαis the difference between the peak temperature of theα1 peak and that of theθ2 peak of loss tangent (tanδ). It can be produced from a cuprammonium solution containing cellulose and casein and having a casein content of 3-15wt.% based on the cellulose by evaporating 20-40wt.% of the ammonia in the aqueous solution before contacting the solution with a coagulation liquid, bringing the aqueous solution to contact with a coagulation liquid and treating the coagulate with an acidic aqueous solution. The cuprammonium solution containing cellulose and casein has positive peak of the circular dichroism spectrum (CD) at 490-500nm after the evaporation of ammonia.
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