Mitsubishi Gas Chemical Company, Inc.

Thai Polyacetal Co., Ltd.

Wandee Thuamthong

Akira Ito

Daisuke Sunaga

Yuuta Yamamoto

Yupin Pattamamongkolchai

The present invention is to provide a process for producing an oxymethylene copolymer, in which deteriorate due to oxidation hardly occurs, an amount of formaldehyde generated from the product when stored for a long time under environment of high temperature and high humidity is reduced, and occurrence of mold deposit during molding is small. A process for producing an oxymethylene copolymer includes Step 1 of polymerizing polymer raw materials containing trioxane and a comonomer in the presence of a specific amount of an acid catalyst, Step 2 of adding a hydroxylamine compound represented by the following general formula (1): to a product obtained in the Step 1 in an amount of 1 to 20-fold mol based on an amount of the acid catalyst and mixing these, andStep 3 of further melting and kneading a mixture of the product and the hydroxylamine compound obtained in the Step 2.

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Rayong, Thailand

Wandee Thuamthong