PROCESS FOR THE PREPARATION OF POLYOXYMETHYLENE TERPOLYMER HAVING HIGH DEGREE OF POLYMERIZATION

摘要

To provide a process for preparing at high efficiency a polyoxymethylene terpolymer having a high degree of polymerization which is improved in heat stability. In the process for the preparation of a polyoxymethylene terpolymer having a high degree of polymerization which comprises copolymerizing trioxane as a principal monomer with a cyclic ether or cylcic formal as a comonomer and a polyfunctional glycidyl compound having at least two epoxy groups in its molecule as a third component in the presence of boron trifluoride or a coordination compound thereof as a catalyst, the total amount of the impurities causative of the formation of unstable ends contained in the reaction system is regulated to 1 x 10-2 mole % or below based on the whole amount of the monomers; the catalyst for the copolymerization is used in an amount of 1 x 10-3 to 1 x 10--2 mole % based on the whole amount of the monomers; and the copolymerization is followed by the cooling of the product to a temperature of 45.degree.C or below within 30 seconds to deactivate the catalyst.