PRODUCTION OF POLYETHER COPOLYMER POWDER

摘要

PURPOSE:To obtain the subject powder having crystalline nature and excellent heat-resistance, solvent resistance and mechanical strength by supplying a neutral polar solvent solution containing a polyether copolymer composed of two specific kinds of recurring units to a kneader and granulating the polymer under heating and deaeration at a specific temperature. CONSTITUTION:The objective powder is produced by supplying a solution of a neutral polar solvent (e.g. DMF) containing a polyether polymer composed of the recurring unit of formula I and the recurring unit of formula II (n is 1 or 2) at a molar ratio I/(I+II) of 0.1-0.9 to a kneader (preferably a vented twin-screw extruder) and granulating the polymer under heating and deaerating at 100-300 deg.C and e.g. 50-150rpm while slightly deaerating the system to a pressure of 100-700Torr.