Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft

Bernd Eilhardt

Gerhard B Ziemek

Fritz Glander

Klaus Bauermeister

A tube system, which includes an inner and a concentric outer tube, is provided with a spacer made by cutting oblique notches into a polyurethane foam layer on a paper ribbon and by helically wrapping the ribbon onto the inner tube, the oblique and tapered foam elements pointing inwardly or outwardly, but the notches are aligned to form axial ducts. After forming the outer tube about the spacer, these ducts are filled with material that foams in situ.

Thermally insulated tube

Foam insulated conductor is produced by heating the conductor to a temperature at which the conductor retains sufficient heat to effect crosslinking and foaming of a polymer composition, followed by extruding the polymer composition onto the conductor, with the crosslinking and foaming being effcted by the retained heat.

Foam insulated conductor

A composition for bonding to copper comprised of copolymers and ionic copolymers of ethylene and an .alpha.,.beta.-monoethylenically unsaturated carboxylic acid having incorporated therein a copper deactivating amount of a copper stabilizer or deactivator. The composition has improved moisture-resistant bond strength on copper and laminates of copper and the composition may be employed as a protective sheathing for cables.

Growing community of inventors

Hannover, Germany

Bernd Eilhardt