Highly dielectric film

Abstract

There is provided a highly dielectric film which has high dielectric property, can be formed into a think film and is excellent in winding property (flexibility). The highly dielectric film comprises (A) a vinylidene fluoride polymer, (B) barium titanate oxide particles and/or lead zirconium titanate oxide particles, and (C) an affinity improving agent, wherein the barium titanate oxide particles and/or lead zirconium titanate oxide particles (B) and the affinity improving agent (C) are contained in amounts of 10 to 500 parts by mass and 0.01 to 30 parts by mass, respectively based on 100 parts by mass of the vinylidene fluoride polymer (A).

1 . A highly dielectric film comprising:
 (A) a vinylidene fluoride polymer,   (B) barium titanate oxide particles and/or lead zirconium titanate oxide particles, and   (C) an affinity improving agent comprising at least one kind of a coupling agent, a surfactant or an epoxy group-containing compound, wherein said barium titanate oxide particles and/or lead zirconium titanate oxide particles (B) and said affinity improving agent (C) are contained in amounts of 10 to 500 parts by mass and 0.01 to 30 parts by mass, respectively based on 100 parts by mass of the vinylidene fluoride polymer (A).   
   
   
       2 . The highly dielectric film of  claim 1 , wherein the affinity improving agent (C) is a coupling agent and/or a surfactant. 
   
   
       3 . The highly dielectric film of  claim 2 , wherein the coupling agent is a titanium coupling agent, a silane coupling agent, a zirconium coupling agent or a zircoaluminate coupling agent. 
   
   
       4 . The highly dielectric film of  claim 3 , wherein the coupling agent is a titanium coupling agent or a silane coupling agent. 
   
   
       5 . The highly dielectric film of  claim 1 , comprising a coupling agent. 
   
   
       6 . The highly dielectric film of  claim 1 , wherein the affinity improving agent is an epoxy group-containing compound. 
   
   
       7 . The highly dielectric film of  claim 6 , wherein the epoxy group-containing compound is a compound represented by the formula (C3): 
     
       
         
         
             
             
         
       
     
     where R is hydrogen atom, a monovalent hydrocarbon group having 1 to 10 carbon atoms which may have oxygen atom, nitrogen atom or carbon-carbon double bond, or an aromatic ring which may have a substituent; l is 0 or 1; m is 0 or 1; n is 0 or an integer of 1 to 10. 
   
   
       8 . The highly dielectric film of  claim 1 , comprising barium titanate oxide particles. 
   
   
       9 . The highly dielectric film of any of  claim 1 , which is a film for a film condenser. 
   
   
       10 . A coating composition for forming a highly dielectric film comprising:
 (A) a vinylidene fluoride polymer,   (B) barium titanate oxide particles and/or lead zirconium titanate oxide particles,   (C) an affinity improving agent comprising at least one kind of a coupling agent, a surfactant or an epoxy group-containing compound, and   (D) a solvent,   
     wherein said barium titanate oxide particles and/or lead zirconium titanate oxide particles (B) and said affinity improving agent (C) are contained in amounts of 10 to 500 parts by mass and 0.01 to 30 parts by mass, respectively based on 100 parts by mass of the vinylidene fluoride polymer (A). 
   
   
       11 . The coating composition of  claim 10 , wherein the affinity improving agent (C) is a coupling agent and/or a surfactant. 
   
   
       12 . The coating composition of  claim 11 , wherein the coupling agent is a titanium coupling agent, a silane coupling agent, a zirconium coupling agent or a zircoaluminate coupling agent. 
   
   
       13 . The coating composition of  claim 12 , wherein the coupling agent is a titanium coupling agent or a silane coupling agent. 
   
   
       14 . The coating composition of  claim 10 , wherein the affinity improving agent is an epoxy group-containing compound. 
   
   
       15 . The coating composition of  claim 14 , wherein the epoxy group-containing compound is a compound represented by the formula (C3): 
     
       
         
         
             
             
         
       
     
     where R is hydrogen atom, a monovalent hydrocarbon group having 1 to 10 carbon atoms which may have oxygen atom, nitrogen atom or carbon-carbon double bond, or an aromatic ring which may have a substituent; l is 0 or 1; m is 0 or 1; n is 0 or an integer of 1 to 10. 
   
   
       16 . The coating composition of  claim 10 , comprising barium titanate oxide particles. 
   
   
       17 . The coating composition of  claim 10 , which is used for forming a highly dielectric film for a film condenser. 
   
   
       18 . A method of producing a highly dielectric film, said highly dielectric film comprising:
 (A) a vinylidene fluoride polymer,   (B) barium titanate oxide particles and/or lead zirconium titanate oxide particles, and   (C) an affinity improving agent comprising at least one kind of a coupling agent, a surfactant or an epoxy group-containing compound, wherein said barium titanate oxide particles and/or lead zirconium titanate oxide particles (B) and said affinity improving agent (C) are contained in amounts of 10 to 500 parts by mass and 0.01 to 30 parts by mass, respectively based on 100 parts by mass of the vinylidene fluoride polymer (A),   
     characterized by subjecting the coating composition of  claim 10  to coating on a substrate and drying.