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公开(公告)号：EP4365223A1
公开(公告)日：2024-05-08
申请号：EP22833284.7
申请日：2022-06-30
发明人： TANAKA, Takayuki , MIYAMOTO, Masayoshi , MINAMIYAMA, Tomoki , KUSUNOKI, Takeki , TAIRA, Takahiro , YAMABE, Takuya , YOSHIDA, Hirotoshi , KATO, Taketo , YAMANAKA, Taku , TSUKAMOTO, Mitsuo
摘要： Provided is a method for producing a polytetrafluoroethylene particle, comprising subjecting tetrafluoroethylene to suspension polymerization in an aqueous medium to prepare a suspension-polymerized particle of polytetrafluoroethylene, washing and then crushing the suspension-polymerized particle or crushing the suspension-polymerized particle with washing to prepare a crushed particle, dehydrating the crushed particle to prepare a crushed particle having a water content of 40% by mass or less, and subjecting the dehydrated crushed particle to heat treatment to produce a polytetrafluoroethylene particle.
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2.发明公开WATER REPELLENT POWDER DRYING METHOD, PRODUCTION PROCESS AND PRODUCTION APPARATUS 审中-公开PROCKUUNG VON WASSERBWEISENDEM PULVER，PRODUKTIONSVERFAHREN UND PRODUKTIONSVORRICHTUNG
公开(公告)号：EP2048463A1
公开(公告)日：2009-04-15
申请号：EP07790912.5
申请日：2007-07-18
发明人： KOBAYASHI, Shinichirou , KIDO, Teruo , KIKUNO, Tomonori , UTSUMI, Yasuhiro , TANAKA, Takayuki , TOKUNO, Satoshi
摘要： A semi-finished product obtained as a mixture of PTFE powder and water is put on conveyance trays (70) and is then input to a producing apparatus (10). In the producing apparatus (10), the conveyance trays (70) arranged vertically pass through a first drying zone (41), a second drying zone (42), and a heat treatment zone (43) in this order. In the first drying zone (41), the water contained in the semi-finished product is heated by a microwave to be evaporated. In the second drying zone (42), residual water in the semi-finished product is heated by hot wind to be evaporated. In the heat treatment zone (43), the temperature of dried PTFE powder is kept at approximately 160 °C. The semi-finished product on each conveyance tray (70) passes through the three zones to be PTFE powder as a finished product.
摘要翻译： 将作为PTFE粉末和水的混合物获得的半成品放在输送盘（70）上，然后输入到制造装置（10）。 在制造装置（10）中，垂直排列的搬送托盘（70）依次通过第一干燥区域（41），第二干燥区域（42）和热处理区域（43）。 在第一干燥区（41）中，通过微波将包含在半成品中的水加热以蒸发。 在第二干燥区（42）中，半成品中的残留水被热风加热以蒸发。 在热处理区域（43）中，干燥的PTFE粉末的温度保持在约160℃。 每个输送托盘（70）上的半成品通过三个区域，作为成品的PTFE粉末。
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公开(公告)号：EP4083077A1
公开(公告)日：2022-11-02
申请号：EP21741165.1
申请日：2021-01-15
IPC分类号： C08F8/50 , C08F114/26
摘要： Provided is a method for producing low molecular weight polytetrafluoroethylene that is less likely to generate perfluorooctanoic acid and salts thereof. The disclosure relates to a method for producing low molecular weight polytetrafluoroethylene having a melt viscosity at 380°C of 1.0 × 10 2 to 7.0 × 10 5 Pa.s. The method includes:
(1) irradiating high molecular weight polytetrafluoroethylene with radiation in the presence of a substance capable of generating a free hydrogen atom and decomposing the high molecular weight polytetrafluoroethylene into a low molecular weight component; and (2) deactivating at least part of main-chain radicals and end radicals generated by the irradiation and providing the low molecular weight polytetrafluoroethylene.-
公开(公告)号：EP3822293A1
公开(公告)日：2021-05-19
申请号：EP19835005.0
申请日：2019-07-12
摘要： Provided is a method for producing low-molecular-weight polytetrafluoroethylene which is less likely to generate C6-C14 perfluorocarboxylic acids and salts thereof. The disclosure relates to a method for producing low-molecular-weight polytetrafluoroethylene having a melt viscosity at 380°C of 1.0 × 10 2 to 7.0 × 10 5 Pa·s. The method includes (1) irradiating high-molecular-weight polytetrafluoroethylene with radiation in a substantially oxygen-free state and decomposing the high-molecular-weight polytetrafluoroethylene into a low-molecular-weight component and (2) deactivating, in a substantially oxygen-free state, at least part of main-chain radicals and end radicals generated by the irradiation and providing the low-molecular-weight polytetrafluoroethylene.
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5.发明公开
公开(公告)号：EP4365222A1
公开(公告)日：2024-05-08
申请号：EP22833283.9
申请日：2022-06-30
发明人： TAIRA, Takahiro , MISHIMA, Kazuhiro , TANAKA, Takayuki , KUSUNOKI, Takeki , MIYAMOTO, Masayoshi , MINAMIYAMA, Tomoki , TSUKAMOTO, Mitsuo , ICHIKAWA, Kenji , YAMABE, Takuya , YOSHIDA, Hirotoshi , KATO, Taketo , YAMANAKA, Taku
CPC分类号： C08F8/20
摘要： Provided is a method for producing a polytetrafluoroethylene powder, comprising subjecting tetrafluoroethylene to suspension polymerization in an aqueous medium to prepare a suspension-polymerized particle of non melt-processible polytetrafluoroethylene, drying the suspension-polymerized particle to prepare a dry particle, subjecting the dry particle to fluorine radical treatment to prepare a fluorine radical-treated particle, and crushing the fluorine radical-treated particle to produce a polytetrafluoroethylene powder.
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