| 摘要 |
<p>PROBLEM TO BE SOLVED: To separate respective thermoplastic resins from a resin composition economically at good efficiency to recover a recyclable product by treating a composition comprising at least two thermoplastic resins having different degrees of swelling in a solvent in the presence of a solvent with an extruder. SOLUTION: A composition comprising at least two thermoplastic resins represented by the following formula and having different degrees of swelling in a solvent is treated in the presence of a solvent with an extruder.|S(A)-S(B)|>1(%) (wherein S(A) is the degree (wt.%) of swelling of thermoplastic resin A in a solvent, and S (B) is that of thermoplastic B in the same solvent). When the given thermoplastic is soluble in a solvent, its degree of swelling is 100%. For instance, starting resins or these resins and a solvent are introduced into the hopper of a twin-screw extruder, whereupon only the resin having a higher degree of swelling is dissolved or swollen. The mixture is passed through a filter 5 and is separated into a lowly viscous highly swellable resin 6 and a lowly swellable resin which leaves the extruder 4 from the exit 4.</p> |
