发明申请
- 专利标题： Aqueous polytetrafluoroethylene dispersion composition and process for its production
- 专利标题（中）： 聚四氟乙烯水性分散体组合物及其制备方法
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申请号： US10943865申请日： 2004-09-20
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公开(公告)号： US20050038177A1公开(公告)日： 2005-02-17
- 发明人: Jun Hoshikawa , Shigeki Kobayashi
- 申请人： Jun Hoshikawa , Shigeki Kobayashi
- 申请人地址： JP Tokyo
- 专利权人： ASAHI GLASS COMPANY LIMITED
- 当前专利权人： ASAHI GLASS COMPANY LIMITED
- 当前专利权人地址： JP Tokyo
- 优先权： JP2002-78785 20020320
- 主分类号： C08F6/16
- IPC分类号： C08F6/16 ; C08F6/20 ; C08F14/00 ; C08L1/00
摘要：
To an aqueous PTFE polymer emulsion having a PTFE content of from 10 to 50 mass % obtained by emulsion polymerization of tetrafluoroethylene in the presence of an anionic perfluorocarboxylate surfactant (APFC), from 2 to 20 mass %, based on the mass of PTFE, of a nonionic surfactant having an average molecular weight of from 450 to 800 and an inorganic/organic property ratio of from 1.07 to 1.50 and from 10 to 800 mass %, based on the mass of PTFE, of water are added to obtain an aqueous PTFE dispersion having a PTFE content of from 1 to 40 mass % of PTFE, and then PTFE is concentrated by sedimenting the PTFE and separating a PTFE-rich aqueous dispersion composition from the supernatant. According to the present invention, a PTFE-rich aqueous dispersion composition having a low APFC concentration can be obtained.
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