发明授权
- 专利标题: Process for improving the stability of etherified acetal homopolymers
- 专利标题(中): 提高醚化缩醛均聚物稳定性的方法
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申请号: US870148申请日: 1978-01-17
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公开(公告)号: US4158091A公开(公告)日: 1979-06-12
- 发明人: Pierino Radici , Sergio Custro , Mario Ermoni , Paolo Colombo
- 申请人: Pierino Radici , Sergio Custro , Mario Ermoni , Paolo Colombo
- 申请人地址: ITX Milan
- 专利权人: Societa' Italiana Resine S.I.R. S.p.A.
- 当前专利权人: Societa' Italiana Resine S.I.R. S.p.A.
- 当前专利权人地址: ITX Milan
- 优先权: ITX19353A/77 19770117
- 主分类号: C08G2/00
- IPC分类号: C08G2/00 ; C08G2/30 ; C08G2/34 ; C08G2/36
摘要:
The thermal and chemical stability of etherified acetal homopolymers is improved by heat-treating the latter in the molten state at a temperature of at least 180.degree. C., in the presence of a halide of an alkali or alkaline earth metal, until substantially complete degradation of the unstable polyoxymethylene chains.
公开/授权文献
- US5828268A Microwave switches and redundant switching systems 公开/授权日:1998-10-27
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