The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 2009
Filed:
May. 08, 2008
Robert D. Kenny, Cincinnati, OH (US);
John L. Netta, Newark, DE (US);
Sundar Kilnagar Venkataraman, Avondale, PA (US);
Robert Thomas Young, Newark, DE (US);
Robert D. Kenny, Cincinnati, OH (US);
John L. Netta, Newark, DE (US);
Sundar Kilnagar Venkataraman, Avondale, PA (US);
Robert Thomas Young, Newark, DE (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
FEP compositions are provided that provide foam insulation in coaxial cable that surpasses the return loss obtained when PFA is used to make the foamed insulation, one composition comprising a blend of tetrafluoroethylene/hexafluoropropylene copolymers, one of said copolymers exhibiting a strip force of at least about 3 lbf (13.3 N) and another of said copolymers exhibiting a strip force no greater than about 2.5 lbf (11.1 N), said blend exhibiting a strip force of at least about 3 lbf (13.3 N), each said strip force being the force necessary to break adhesion between conductor and said one of said copolymers, said another of said copolymers, and said blend, respectively, and another composition comprising tetrafluoroethylene/hexafluoropropylene copolymer having an MFR of no greater than about 16 g/10 min and containing —CFend groups and an effective amount of wire affinity end groups to exhibit a strip force of at least about 3 lbf (13.3 N), said strip force being the force necessary to break adhesion between conductor and said copolymer, the coaxial cable exhibiting an average return loss of no greater than about −26 dB at 800 MHz to 3 GHz and having a void content of about 20 to 65% and (b) forming an outer conductor over said foamed insulation.