METHOD FOR PRODUCING OXYMETHYLENE COPOLYMER

申请公布号：

WO2015008537(A1)

申请号：

WO2014JP63735

申请日期：

2014.05.23

申请公布日期：

2015.01.22

申请人：

MITSUBISHI GAS CHEMICAL COMPANY, INC.

发明人：

HIRANO, TOMOYUKI;ITO, AKIRA

分类号：

C08G2/04;C08G2/06;C08G2/10

主分类号：

C08G2/04

摘要：

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 resistance. 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.