Abstract: A broad band electrical signal transmission system comprising:a first central conductor comprising: a plurality of conductive wire strands, a first insulating layer surrounding said wire strands, a conductive sheath surrounding said first insulating layer, and a second insulating layer surrounding said conductive sheath;a second central conductor identical to said first central conductor;a third insulating layer surrounding said first and second central conductors;a tubular shield surrounding said third insulating layer, said tubular shield comprising a braid of composite wire wherein said composite wire comprises: a central core of an amorphous metal material, a conductive cladding surrounding said central core, and a layer of silver surrounding said conductive cladding; anda dielectric sheath surrounding said tubular shield.

Abstract: A novel polymer alloy coating is provided consisting essentially of polyphenylene sulfide and an amount of polyimide. The polyimide is produced by the crosslinking and curing of an acetylene terminated aromatic polyimide oligomer resin. The amount of polyimide utilized is sufficient to enhance the adhesiveness of the polyphenylene sulfide to a metal substrate without substantially changing the melt flow properties, chemical resistance and thermal stability of the polyphenylene sulfide. A polymer alloy resin composition is also provided for application to the metal substrate to produce the polymer alloy coating. The novel polymer alloy coating is particularly suitable for coating pipes, particularly pipe couplings for oil and gas well production pipes which are exposed to extreme temperatures, pressures and corrosive environments.