PROCESS FOR THE PRODUCTION OF HEAT-RESISTANT MOULDABLE ACETAL POLYMER

摘要

A polyacetal polymer is prepd. by melting a crude polyacetal polymer or copolymer contg. oxymethylene gp. bonded to main chain of the molecular and heating it in an insoluble liq. medium at 80≦̸C or more thus maintaining the heterogeneous system. The crude polymer is pref. a polyacetal copolymer contg. an oxyalkylene gp. and at least two adjacent carbon atoms in the main chain. The crude polymer is melted in the presence of a stabilizer and/or alkaline material and 10wt.% or less of water. The polyacetal polymer has an improved heat stability and mouldability.