High temperature polyimide-fluoropolymer laminar structure
AssigneeE. I. Du Pont de Nemours and Company
InventorsMorton Katz, Philip R. LaCourt
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Abstract
Laminar structures having a polyimide core layer, inner fluorinated ethylenepropylene copolymer (FEP) layers, intermediate polytetrafluoroethylene homopolymer (PTFE) and fluorinated ethylenepropylene copolymer (FEP) blend layers and outer fluorinated ethylenepropylene copolymer (FEP) layers for use in the form of narrow tapes as an insulating wire or cable wrap.
Claims17
A laminar film structure consisting essentially of a core layer of a polyimide film;
- inner layers of a fluorinated ethylenepropylene copolymer (FEP) bonded to both sides of said polyimide core layer;
- intermediate layers of a blend of polytetrafluoroethylene (PTFE) and a fluorinated ethylenepropylene copolymer (FEP) bonded to both of said inner FEP layers;
- and outer layers of fluorinated ethylenepropylene copolymer (FEP) bonded to both of said intermediate PTFE-FEP blend layers.
An insulated wire or cable spirally wrapped by at least one strip of a laminar film structure consisting essentially of a core layer of a polyimide film;
- inner layers of a fluorinated ethylenepropylene copolymer (FEP) bonded to both sides of said polyimide core layer;
- intermediate layers of a blend of polytetrafluoroethylene (PTFE) and a fluorinated ethylenepropylene copolymer (FEP) bonded to both of said inner FEP layers;
- and outer layers of fluorinated ethylenepropylene copolymer (FEP) bonded to both of said intermediate PTFE-FEP blend layers;
- wherein the edges of said strip of laminar film structure overlap and said strip is heat-sealed at the overlapped edges.
Dependencies are inferred from the claim text.