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    • 1. 发明授权
    • Stratified fibrous fluoropolymer compositions and process for forming
such fluoropolymers
    • 分层纤维状含氟聚合物组合物和形成这种含氟聚合物的方法
    • US4859745A
    • 1989-08-22
    • US136690
    • 1987-12-22
    • William P. CarlEmmett L. TassetRobert E. Aikman, Jr.
    • William P. CarlEmmett L. TassetRobert E. Aikman, Jr.
    • C08F259/08
    • C08F259/08Y10S525/902
    • The invention is a process for producing a modified polytetrafluoroethylene which comprises polymerizing tetrafluoroethylene in an aqueous medium containing a dispersing agent with a polymerization initiator source and then, copolymerizing tetrafluoroethylene one or more fluorinated modifiers having an acid functional group or a functional group which is convertible to the acid group as a copolymerizable modifier in the presence of the resulting polytetrafluoroethylene to a polymerization point past the Kraft point to produce highly porous, fibrous, stratified fluoropolymers having cores made of homopolymer of poly-tetrafluoroethylene coated with sheath layers which are made of a copolymer of polytetrafluoroethylene and one or more modifiers.The invention also includes a highly porous, fibrous, stratified fluoropolymer having a plurality of interconnected, fibrous-like projections wherein the stratified fluoropolymer has a core layer of polytetrafluoroethylene substantially completely covered by a copolymer of polytetrafluoroethylene and a fluorocarbon modifier.
    • 本发明是一种改性聚四氟乙烯的制造方法,其特征在于,在含有聚合引发剂源的分散剂的水性介质中聚合四氟乙烯,然后使四氟乙烯与一种或多种具有酸官能团或官能团的氟化改性剂共聚, 该酸基团作为可共聚改性剂,在所得聚四氟乙烯存在下,聚合点经过牛皮纸点,以产生具有由涂覆有鞘层的聚四氟乙烯均聚物制成的芯的高度多孔,纤维状分层的含氟聚合物, 的聚四氟乙烯和一种或多种改性剂。 本发明还包括具有多个相互连接的纤维状突起的高度多孔,纤维状分层的氟聚合物,其中分层含氟聚合物具有基本上被聚四氟乙烯和氟碳改性剂的共聚物完全覆盖的聚四氟乙烯核心层。
    • 4. 发明授权
    • Process for forming a shaped porous fluorinated polymer catalyst and the
resultant product
    • 用于形成成形的多孔氟化聚合物催化剂和所得产物的方法
    • US4748190A
    • 1988-05-31
    • US813130
    • 1985-12-24
    • William P. Carl
    • William P. Carl
    • B01J31/06B01J31/08C08F4/02C08J9/06B29C67/22C08J9/12
    • C08F4/027B01J31/08B01J2231/323B01J2231/326B01J2231/52B01J2231/64Y10S264/09
    • The invention is a process for making a high surface area, self-supporting catalyst suitable for use as an acid catalyst comprising:(a) at least partially polymerizing a perfluorinated monomer containing ion exchange groups convertible to an acid or salt form in a medium containing a gas-forming ingredient(s) which is present during polymerization and serves a polymerization enhancement purpose during polymerization; wherein the said gas-forming ingredient(s) is a material that will convert into a gaseous state and expand when heated; and(b) heating the polymer to a temperature sufficient to soften the polymer and sufficient to convert at least a portion of the gas-forming ingredient(s) into a gaseous state while the polymer is still in contact with at least a portion of the gas-forming ingredient(s), thereby converting the gas-forming ingredient(s) into a gas which expands the polymer and causes the formation of open and closed pores within the polymer.
    • 本发明是一种制备适合用作酸催化剂的高表面积自支撑催化剂的方法,其包括:(a)至少部分地将含有可转化为酸或盐形式的离子交换基团的全氟化单体在含有 在聚合期间存在的气体形成成分,并且在聚合期间用作聚合增强目的; 其中所述气体形成成分是将被转化成气态并在加热时膨胀的材料; 和(b)将聚合物加热到足以软化聚合物的温度,并且足以将至少一部分气体形成成分转化为气态,同时聚合物仍然与至少一部分 气体形成成分,从而将气体形成成分转化为膨胀聚合物并使聚合物内形成开放和闭孔的气体。