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Abstract

Provided is a method for producing an oxymethylene copolymer continuously and with high polymerization yield, whereby it becomes possible to improve heat stability and the formaldehyde generation amount while keeping MD resistance and folding endurance. Provided is a method for producing an oxymethylene copolymer, which comprises the steps of: carrying out a copolymerization reaction of a monomer raw material comprising trioxane and 1,3-dioxolane in an amount of 7.0 to 22 mass % relative to the amount of trioxane in the presence of boron trifluoride in an amount of 0.03 to 0.10 mmol relative to 1 mol of trioxane and sterically hindered phenol in an amount of 0.006 to 2.0 mass % relative to the amount of trioxane; and adding a polymerization terminator to a reaction system at the point of time at which the polymerization yield of the copolymer becomes 92% or more to terminate the polymerization.

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First Claim