Title:
オキシメチレン共重合体の製造方法
Document Type and Number:
Japanese Patent JP6934857
Kind Code:
B2
Abstract:
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, in particular, 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. More specifically, provided is a process for producing an oxymethylene copolymer which comprises
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):
wherein R 1 and R 2 are as defined in the claims and the specification,
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, and
Step 3 of further melting and kneading a mixture of the product and the hydroxylamine compound obtained in the Step 2.
Inventors:
Yuta Yamamoto
Daisuke Sucho
Akira Ito
Tuam Thong Wandee
Patamamon Kunchai Yupin
Daisuke Sucho
Akira Ito
Tuam Thong Wandee
Patamamon Kunchai Yupin
Application Number:
JP2018505911A
Publication Date:
September 15, 2021
Filing Date:
March 13, 2017
Export Citation:
Assignee:
Mitsubishi Gas Chemical Co., Ltd.
International Classes:
C08G2/28; C08K5/17; C08L59/00
Domestic Patent References:
| JP2015206025A | ||||
| JP2011527358A | ||||
| JP11269374A | ||||
| JP2005508377A |
Foreign References:
| WO2006109780A1 |
Attorney, Agent or Firm:
Patent business corporation Tsukuni