Abstract: Multilayer polyimide-fluoropolymer insulation structures exhibiting excellent heat seal strength and superior internal adhesion strength comprise a base layer of polyimide having first and second major surfaces and a first fluoropolymer layer. The first fluoropolymer layer may be on the first major surface of the polyimide layer. Alternatively, it may be separated from the first major surface of the polyimide layer by an intervening layer. The first fluoropolymer layer comprises from about 70 to about 98% by weight of fluoroethylene propylene polymer (‘FEP’) and from about 30 to about 2% by weight of polytetrafluoroethylene polymer (‘PTFE’) or poly(tetrafluoroethylene-co-perfluoro[alkyl vinyl ether]) (‘PFA’) based on the total weight of the first fluoropolymer layer. Structures having fluoropolymer layers on both surfaces of the polyimide layer are also provided. Protected wire or cable using the composite, and methods are also described.

Abstract: Multilayer polyimide-fluoropolymer insulation structures exhibiting excellent heat seal strength and superior internal adhesion strength comprise a base layer of polyimide having first and second major surfaces and a first fluoropolymer layer. The first fluoropolymer layer may be on the first major surface of the polyimide layer. Alternatively, it may be separated from the first major surface of the polyimide layer by an intervening layer. The first fluoropolymer layer comprises from about 70 to about 98% by weight of fluoroethylene propylene polymer (‘FEP’) and from about 30 to about 2% by weight of polytetrafluoroethylene polymer (‘PTFE’) or poly(tetrafluoroethylene-co-perfluoro[alkyl vinyl ether]) (‘PFA’) based on the total weight of the first fluoropolymer layer. Structures having fluoropolymer layers on both surfaces of the polyimide layer are also provided. Protected wire or cable using the composite, and methods are also described.

Abstract: A dielectric composite is provided that is useful for wrapping wire or cable or for supporting electronic circuitry. The composite comprises a polyimide layer having first and second major surfaces; a first fluoropolymer layer on the first major surface on the polyimide layer, said first fluoropolymer layer comprising at least about 55% PFA; and a second fluoropolymer layer on the second major surface on the polyimide layer, said second fluoropolymer layer comprising at least about 55% PFA. Protected wire or cable using the composite, and methods are also described.