Compositions for compounding, extrusion and melt processing of foamable and cellular fluoropolymers
    1.
    发明授权
    Compositions for compounding, extrusion and melt processing of foamable and cellular fluoropolymers 有权
    用于发泡和细胞含氟聚合物的混合,挤出和熔融加工的组合物

    公开(公告)号:US07968613B2

    公开(公告)日:2011-06-28

    申请号:US12221280

    申请日:2008-08-01

    摘要: The present invention relates generally to the use of talc as a chemical foaming agent in perfluoropolymers to form foamable and foamed compositions. For example, in one aspect, a foamable composition is disclosed, which comprises (i) one or more base perfluoropolymers comprising at least 50 percent by weight of the composition, and (ii) talc blended with the one or more base perfluoropolymers, where the talc comprises 3 percent to about 15 percent by weight of the composition. Each of the perfluoropolymers is selected from the group consisting of tetrafluoroethylene/perfluoromethylvinyl ether copolymer (MFA), hexafluoropropylene/tetrafluoroethylene copolymer (FEP) and perfluoroalkoxy (PFA) and any blend thereof, where hydrogen-containing fluoropolymers are absent from the composition. The one or more base perfluoropolymers are melt-processable at one or more elevated processing temperatures of at least about 600° F. at which the talc functions as a chemical foaming agent for extrusion or mold processing of the composition into a foamed article having uniform cell structures.

    摘要翻译: 本发明一般涉及在全氟聚合物中使用滑石作为化学发泡剂来形成可发泡和发泡的组合物。 例如,一方面,公开了一种可发泡组合物,其包含(i)一种或多种包含至少50重量%组合物的碱性全氟聚合物,和(ii)与一种或多种碱性全氟聚合物共混的滑石,其中 滑石占组合物重量的3%至约15%。 每个全氟聚合物选自四氟乙烯/全氟甲基乙烯基醚共聚物(MFA),六氟丙烯/四氟乙烯共聚物(FEP)和全氟烷氧基(PFA)及其任何共混物,其中组合物中不存在含氢的含氟聚合物。 一种或多种碱性全氟聚合物在至少约600°F的一个或多个升高的​​加工温度下是可熔融加工的,其中滑石用作化学发泡剂,用于将组合物挤出或模塑加工成具有均匀电池的发泡制品 结构。