Oxymethylene-copolymer manufacturing method

A method for manufacturing an oxymethylene copolymer, comprising:

• polymerizing a polymerization raw material containing trioxane and a comonomer in the presence of 1.0×10−8 moles or more and 1.0×10−6 moles or less of an acid catalyst per 1 mole of trioxane;
• deactivating the acid catalyst by adding and mixing a hydroxylamine compound represented by General formula (1) below:
• where R1 and R2 each independently represent a hydrogen atom or a C1-C20 organic group, with the product obtained during the polymerizing of the polymerization raw material, wherein the hydroxylamine compound is in an amount of 50-5000 molar times the amount of the acid catalyst;
• and
• further melt-kneading the mixture of the product and the hydroxylamine compound obtained during the adding and mixing of the hydroxylamine compound,
• wherein the hydroxylamine compound is at least one selected from the group consisting of N,N-diethyl hydroxylamine;
• N,N-dibenzyl hydroxylamine;
• and N-isopropyl hydroxylamine.