Conductive melt-processible fluoropolymer

A method for producing a melt-processible fluoropolymer powder having an average particle size of no more than about 10 μm, comprising stirring an aqueous dispersion polymerization medium containing said fluoropolymer polymerized in said medium, said medium also containing electrolyte, to form a coagulum of said fluoropolymer, separating said coagulum from the resulting medium, drying said coagulum, and then pulverizing said dried coagulum together with carbon black having a primary particle size of no more than about 0.1 μm, and obtaining said powder as a mixture of said carbon black in said fluoropolymer.

A fluoropolymer powder comprising coagulum particles of melt-processible fluoropolymer having an average particle size of about 1 to 10 μm coated with particles of carbon black.

An electrically conducting fluoropolymer composition, said composition comprising conducting carbon black dispersion in a melt processible fluoropolymer wherein said melt processible fluoropolymer has two crystallization peaks when analyzed in a differential scanning calorimeter when allowed to crystallize from a temperature of not less than its melting point at a cooling rate of 12° C./min;

• and the ratio of the crystallization peak heights (high temperature side peak/low temperature side peak) is about 0.65 or greater;
• and/or the ratio of the high temperature side crystallization peak areas [high temperature side peak area/(high temperature side peak area+low temperature side peak area)] is about 0.18 or greater.