Process for producing oxymethylene copolymer and resinous composition

摘要

A process for producing an oxymethylene copolymer, comprising the steps of polymerizing trioxane and cyclic ether in the presence of a boron trifluoride catalyst, adding a hindered amine compound to the polymer obtained by said polymerization, and stabilizing instable chain ends of the polymer. The oxymethylene copolymer thus obtained provides excellent heat resistance and superior mechanical properties.