Patent ID: 8178592
Filing Date: 2012-05-15
Classification: C08J,C08L,H01B

Abstract:
1. A foamable composition comprising melt-fabricable tetrafluoroethylene/hexafluoropropylene copolymer, tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, wherein the alkyl contains 1 to 4 carbon atoms, and foam cell nucleating agent, the melting temperature of said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer being no more than 35° C. greater than the melting temperature of said tetrafluoroethylene/hexafluoropropylene copolymer, wherein said tetrafluoroethylene/hexafluoropropylene copolymer contains 0.2 to 4 wt % perfluoro(alkyl vinyl ether), wherein said alkyl contains 1 to 4 carbon atoms and perfluoro(alkyl vinyl ether) of said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer is present in an effective amount to prevent sloughing of said composition at the exterior of an extrusion die in the extrusion foaming of said composition.