Fluororesin composite compositions

Abstract

The present invention relates to a heat-meltable fluoropolymer composite composition having excellent thermal conductivity, gas and chemical liquid barrier properties and dynamic properties such as storage modulus which comprises a heat-meltable fluoropolymer fine powder and a layered-compound organized by treatment with tetraphenyl phosphonium ions. The present invention also relates to a heat-meltable fluoropolymer composite composition having similar properties to those mentioned above which is obtained by a process (I) in which a heat-meltable fluoropolymer composite composition is obtained by grinding and mixing a heat-meltable fluoropolymer fine powder and a layered-compound and a process (II) in which such heat-meltable fluoropolymer composite composition thus obtained is melted and mixed under shear stress by means of a melt-mixing extruder.

1 . A heat-meltable fluoropolymer composite composition comprising a heat-meltable fluoropolymer fine powder and a layered-compound organically modified with tetraphenyl phosphonium ions.  
   
   
       2 . The heat-meltable fluoropolymer composite composition according to  claim 1 , wherein the heat-meltable fluoropolymer fine powder is an agglomerate powder having average particle size of not more than 10 μm which comprises agglomerated colloidal fine particles of heat-meltable fluoropolymer.  
   
   
       3 . The heat-meltable fluoropolymer composite composition according to  claim 1 , wherein said heat-meltable fluoropolymer is a polymer or copolymer of a monomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, perfluoro(alkylvinylether), vinylidenefluoride and vinylfluoride, and a copolymer of any of these monomers and ethylene or propylene.  
   
   
       4 . The heat-meltable fluoropolymer composite composition according to  claim 1 , wherein at least part of said heat-meltable fluoropolymer is heat-meltable fluoropolymer containing a functional group.  
   
   
       5 . The heat-meltable fluoropolymer composite composition according to  claim 1 , wherein said layered-compound is at least one selected from the group consisting of clay mineral, mica and graphite which is not more than 10 μm in average particle size.  
   
   
       6 . The heat-meltable fluoropolymer composite composition according to  claim 5 , wherein said layered-compound is clay mineral or mica.  
   
   
       7 . The heat-meltable fluoropolymer composite composition according to  claim 6 , whose nitrogen gas transmission rate is not more than 0.60 times as high as that of heat-meltable fluoropolymer containing no layered-compound.  
   
   
       8 . The heat-meltable fluoropolymer composite composition according to  claim 6 , whose storage modulus at 25° C. is not less than 1.5 times as high as that of heat-meltable fluoropolymer containing no layered-compound.  
   
   
       9 . A process for manufacturing a heat-meltable fluoropolymer composite composition which comprises a process (I) in which a heat-meltable fluoropolymer composite composition is obtained by mixing a heat-meltable fluoropolymer fine powder and a layered-compound and a process (II) in which such heat-meltable fluoropolymer composite composition thus obtained is melt-mixed by exerting shear stress by means of a melt-mixing extruder.  
   
   
       10 . The process for manufacturing a heat-meltable fluoropolymer composite composition according to  claim 9 , wherein said heat-meltable fluoropolymer fine powder is an agglomerate powder having average particle size of not more than 10 μm which comprises agglomerated colloidal fine particles of heat-meltable fluoropolymer.  
   
   
       11 . The process for manufacturing a heat-meltable fluoropolymer composite composition according to  claim 9 , wherein the mixing of a heat-meltable fluoropolymer fine powder and a layered-compound is carried out by use of a high-speed rotary mixer whose blades or cutter knives have a circumferential velocity of not less than 35 m/sec.  
   
   
       12 . A heat-meltable fluoropolymer composite composition which is obtained by a process (I) in which a heat-meltable fluoropolymer composite composition is obtained by mixing a heat-meltable fluoropolymer fine powder and a layered-compound and a process (II) in which such heat-meltable fluoropolymer composite composition thus obtained is melt-mixed by exerting shear stress by means of a melt-mixing extruder.  
   
   
       13 . The heat-meltable fluoropolymer composite composition according to  claim 12 , wherein said layered-compound is organically modified with onium ions.  
   
   
       14 . The heat-meltable fluoropolymer composite composition according to  claim 12 , wherein said layered-compound is at least one selected from the group consisting of clay mineral, mica and graphite which is not more than 10 μm in average particle size.  
   
   
       15 . The heat-meltable fluoropolymer composite composition according to  claim 12 , whose nitrogen gas transmission rate is not more than 0.60 times as high as that of heat-meltable fluoropolymer containing no layered-compound.  
   
   
       16 . The heat-meltable fluoropolymer composite composition according to  claim 12 , whose storage modulus at 25° C. is not less than 1.5 times as high as that of heat-meltable fluoropolymer containing no layered-compound.  
   
   
       17 . The heat-meltable fluoropolymer composite composition according to  claim 12 , whose specific thermal conductivity is not less than 2 times as high as that of heat-meltable fluoropolymer containing no layered-compound.