发明授权
- 专利标题: Process for preparing polyacetal copolymer
- 专利标题(中): 制备聚缩醛共聚物的方法
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申请号: US698190申请日: 1996-08-15
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公开(公告)号: US5866670A公开(公告)日: 1999-02-02
- 发明人: Akira Nakai , Kaoru Yamamoto , Eiji Masuda , Hiroyuki Kanai
- 申请人: Akira Nakai , Kaoru Yamamoto , Eiji Masuda , Hiroyuki Kanai
- 申请人地址: JPX
- 专利权人: Polyplastics Co., Ltd.
- 当前专利权人: Polyplastics Co., Ltd.
- 当前专利权人地址: JPX
- 优先权: JPX7-211755 19950821; JPX7-249300 19950927
- 主分类号: C08G2/06
- IPC分类号: C08G2/06 ; C08G4/00
摘要:
A process for producing a polyacetal copolymer, which is extremely heat-stable and is extremely reduced in the quantity of unstable terminals even in a high polymerization yield in which trioxane as the principal monomer, comprises copolymerization of trioxane as the principal monomer with a cyclic ether or cyclic formal having at least one carbon-to-carbon bond as the comonomer by using a specific heteropoly-acid or acid salt thereof as a polymerization catalyst until the content of the remaining monomers is lowered to at most 10% by weight based on all the monomers fed, adding 0.01 to 10% by weight, based on the resulting crude polymer, of a solution containing a catalyst deactivator, or contacting a basic gas as the deactivator to deactivate the catalyst, and subjecting the crude polymer as such to heat melting treatment without washing thereof.
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