Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1989-04-17
1991-10-22
Kendell, Lorraine T.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
174110F, 174120SR, 428375, 428379, 428421, 428422, B32B 1500, B32B 2700, H01B 700
Patent
active
050594834
ABSTRACT:
Shaped articles of cross-linked polymers comprising a first component having little or no cross-linking and high elongation, and a second component having a relatively high level of cross-linking and low elongation. Such articles are particularly useful in the form of electrical insulation, the first component being adjacent to a wire or other conductor. Preferably each of the components comprises a crystalline fluorocarbon polymer, especially an ethylene/tetrafluoroethylene copolymer. Such articles can be prepared by (1) melt-extruding a first polymeric composition which contains little or no cross-linking agent, and a second polymeric composition which contains a greater amount of cross-linking agent, (2) maintaining the two extrudates under conditions such that cross-linking agent migrates from the second to the first composition, and (3) cross-linking both compositions, preferably by radiation.
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Military Specification Sheet MIL-W-22759/34B, Published Jul. 10, 1980.
Report Number TR-2333, "Testing of Selected Aircraft Electrical Wire Insulations".
Enault Neal
Lunk Hans E.
Mehan Ashok
Burkard Herbert G.
Kendell Lorraine T.
Raychem Corporation
Rice Edith A.
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