Electricity: conductors and insulators – Conduits – cables or conductors – Conductive armor or sheath
Reexamination Certificate
1998-01-14
2001-07-24
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Conductive armor or sheath
C174S036000, C174S028000, C174S103000
Reexamination Certificate
active
06265667
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to cables. More particularly the invention relates to coaxial cables and particularly CATV cables.
BACKGROUND OF THE INVENTION
Coaxial cables are generally susceptible to moisture migration between the insulation and the conductor. This moisture reacts with the metallic surface of the conductor and causes corrosion to develop on the conductor. This corrosion, in certain instances, is accelerated when there are corrosion elements such as salt.
The present method used to prevent corrosion for coaxial type cables is to have the insulation bonded to the conductor in such a manner that moisture may not attack the conductor. However, such a bond may interfere with the clean stripping of the insulation from the conductor.
Also, in many of the CATV type coaxial cables, the wire braid is generally protected by flooding the cable with a flooding agent usually made from polyethylene grease or similar gel-likes substances. This material is generally deposited between the metallic shield and the jacket of the cables. Alternatively some cables presently use an anti-corrosion powder which is also deposited between the metallic shield and the jacket of the cable. However, these methods provide a coaxial cable which is messy and difficult to install or replace in the field.
SUMMARY OF THE INVENTION
The present invention provides a coaxial cable having a central conductor having bonded thereto an anti-corrosion or corrosion inhibiting composition and having over the anti-corrosion composition an appropriate insulation. The anti-corrosion composition is such that it will bond to the insulation and allow a clean stripping of the insulation from the central conductor. Surrounding the insulation is a bonded laminated tape and a wire braid shield having bonded thereto an anti-corrosion composition. Surrounding the wire braid shield is a jacket.
Therefore, one object of the present invention is to provide a coaxial cable wherein the central conductor as a non-gel and non-powder anti-corrosion composition bonded to the central conductor, a shielding tape-wire braid combination having a non-gel and non-powder anti-corrosion composition bonded to the shielding tape-wire braid combination, said cable when subjected to a salt fog at 92°-97° F. for 144 hours has no corrosion on the shielding tape nor on the wire braid, and less than 1 inch corrosion migration for the central conductor.
It is another object of the present invention to provide a coaxial cable having a central copper conductor having bonded thereto an anti-corrosion composition of formaldehyde and [{Di-(2-hydroxyethyl)imino}methyl]Ar-Methyl-1-H-Benzotriazole, a dielectric insulation surrounding the corrosion protected, conductor, an aluminum tape surrounding the dielectric insulation and an aluminum wire braid surrounding the aluminum tape and the combination of aluminum tape and aluminum wire braid being coated with and having bonded thereto an anti-corrosion composition containing metal ionomers of polyethylene and acrylic acid copolymers wherein the metal is selected from Zn, Ca, Na and Mg, and the aluminum tape and aluminum braid combination have an insulation jacket extruded thereon.
Another object of the present invention to provide a coaxial cable having a central copper conductor having bonded thereto an anti-corrosion composition of formaldehyde and [{Di-(2-hydroxyethyl)imino}methyl]Ar-Methyl-1-H-Benzotriazole, a dielectric insulation surrounding the corrosion protected copper conductor, a copper tape surrounding the dielectric insulation and a copper wire braid surrounding the copper tape and the combination of copper tape and copper wire braid being coated with and having bonded thereto an anti-corrosion composition of formaldehyde and [{Di-(2-hydroxyethyl)imino}methyl]Ar-Methyl-1-H-Benzotriazole, and the copper braid combination have an insulation jacket extruded thereon.
A further object of the present invention is to provide a method of preparing a coaxial cable during the manufacture of the coaxial cable wherein a central copper conductor is coated with an aqueous emulsion having as its essential ingredients formaldehyde and [{Di-(2-hydroxyethyl)imino}methyl]Ar-Methyl-1-H-Benzotriazole, drying the composition on the conductor to bond the composition to the copper conductor, extruding and bonding a dielectric insulation onto the coated conductor, simultaneously wrapping the dielectric insulation with an aluminum tape and an aluminum wire braid wherein the aluminum wire braid surrounds the aluminum tape to form an aluminum tape-braid combination, coating the aluminum tape-braid combination with an aqueous emulsion of a metal ionomer of polyethylene and acrylic acid copolymer wherein the metal is selected from Zn, Ca, Na and Mg, and drying the aqueous emulsion coating to bond the polyethylene acrylic acid copolymer ionomer to the aluminum tape-braid combination to provide a corrosion protected aluminum tape-braid combination and extruding an insulation jacket around said aluminum tape-braid combination.
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Miller Jeffrey A.
Pope Bradley G.
Stipes Jason A.
Belden Wire & Cable Company
Conte Robert F. I.
Lee Mann Smith McWilliams Sweeney & Ohlson
Mayo, III William H
Reichard Dean A.
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