Cable with foamed plastic insulation comprising and ultra-high die swell ratio polymeric material
First Claim
1. An electrical communications element comprising a conductor and a surrounding foamed plastic insulation, said foamed plastic insulation comprising a blend of less than 20% by weight of a polymer having an ultra-high die swell ratio greater than 55% and at least one additional polymer composition having a high thermally accelerated stability as defined by an oxidative induction time (OIT) of greater than 15 minutes at 200°
- C. according to ASTM method 4568.
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Accused Products
Abstract
An electrical communications element having a foamed plastic insultation extruded about a conductor with said insulation including at least one component with more than 20% by weight of an ultra-high die swell ratio polymer (UHDSRP), preferably around 15% by weight. The UHDSRP is defined as greater than 55% die swell ratio and more preferably greater than 65% die swell ratio. The insulation also preferably includes at least a second component with a high degree of stress crack resistance, such that the combination of (minimally) these polymers will yield an insulation layer that has a unique combination of physical propeties yielding a high degree of foaming, small uniform cell structure, characteristically lower attenuation, and stress crack resistance capable of withstanding greater than 100 hours at 100° C. while coiled at a stress level of 1 times the insulation outside diameter without failure (cracking).
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Citations
24 Claims
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1. An electrical communications element comprising a conductor and a surrounding foamed plastic insulation, said foamed plastic insulation comprising a blend of less than 20% by weight of a polymer having an ultra-high die swell ratio greater than 55% and at least one additional polymer composition having a high thermally accelerated stability as defined by an oxidative induction time (OIT) of greater than 15 minutes at 200°
- C. according to ASTM method 4568.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electrical communications cable comprising a conductor and a surrounding foamed plastic insulation, said foamed plastic insulation comprising a blend of a first polyolefin having an ultra high die swell ratio greater than 55% present in an amount less than 20% by weight and at least one additional polyolefin having a high environmental stability as defined by an oxidative induction time (OIT) of greater than 15 minutes at 200°
- C. according to ASTM method 4568.
- View Dependent Claims (14, 15, 16, 17, 18)
- 19. An electrical communications cable comprising a conductor and a surrounding foamed plastic insulation, said foamed plastic insulation comprising a blend of a first polyolefin having an ultra high die swell ratio greater than 55% present in an amount less than 20% by weight and a highly stabilized polyolefin containing phenolic antioxidants or phenolic antioxidant-phosphite blends together with a hindered amine light stabilizer.
Specification