摘要 |
<p>A thin, lightweight insulated wire comprises a core 10 with an insulating polymeric sheath comprising an inner layer 12 of polytetrafluroethylene (PTFE), a middle layer (14) of an aromatic and/or heterocyclic ring-containing polymer such as polyetheretherketone (PEEK) to provide enhanced mechanical properties such as abrasion and cut-through resistance and an outer layer (16) of PTFE which provides electrical and chemical resistance and allows the whole construction to be sintered. Alternatively the middle layer may comprise PAEK, PEKK, PEK or PEKEKK. The middle layer may undergo some flow and alloying during sintering, which may provide additional and unexpected benefits. The preferred thickness of each film is 25 to 50 pm although the thickness may range between 12 to 100µm. The use of such thin films allows for a compact, thin and lightweight insulation to be produced.</p> |