Patent ID: 8784961
Filing Date: 2014-07-22
Classification: B29K,C08F,C08K,C08L,Y10T

Abstract:
1. Perfluoropolymer composite obtained by dispersing layered-silicate having properties of swelling or cleaving in water to form an aqueous dispersion of said layered-silicate, adding said aqueous dispersion to an aqueous dispersion of perfluoropolymer having a melt flow rate of 0.5 to 100 g/10 min and agglomerating the resultant mixture of dispersions by changing the ionic strength or pH of said resultant mixture by adding 0.001 to 5 weight percent of electrolyte thereto based on the combined weight of said aqueous dispersion of layered-silicate and said aqueous dispersion of perfluoropolymer, and applying shear to obtain as a result thereof said perfluoropolymer composite comprising a dispersion of particles of said layered-silicate homogeneously dispersed at the nano-level in said perfluoropolymer, wherein the layer thickness of said layered-silicate in said perfluoropolymer composite is less than about 25 nm, and wherein the ratio of the storage elasticity (G′ s ) of the perfluoropolymer composite to the storage elasticity (G′ F ) of the perfluoropolymer, G′ s /G′ F , is 3 or greater at temperatures greater than the glass transition temperature of said perfluoropolymer, said perfluoropolymer being a copolymer of tetrafluoroethylene and perfluoro(alkyl vinyl ether), wherein said alkyl contains from 1 to 5 carbon atoms.