Siemens Aktiengesellschaft

Ulrich Leute

Ferdinand Quella

Karl-Heinz Reichert

Jurgen Bednarz

Stawros Ewangelidis

Wolfgang Schoeppel

The production of thermoplastics by polymerization of olefins in the presence of light metal non-ferrous metal or alloys thereof by means of a heterogenous Ziegler-Natta catalyst is taught. Preferably, the polyolefin is crosslinked in regions thereof adjacent the metal particles. The product resins can be employed either alone or as a component of a polyblend with other polymers for the purpose of achieving heat removal with simultaneous electrical insulation in electronic and electrical engineering applications.

Thermally conducting, electrically insulating thermoplastics

A filler composition composed of metal particles present in the tightest possible packing which are individually coated with a cross-linked polymer layer is provided which has high thermal conductivity and high electrical insulation capacity. Such filler composition is usefull as an addition to resins employed in injection molding and extrusion. A high resistance to abrasion is achieved by the cross-linked coating layers (22,24). A filing degree of about 90 Vol. % is achievable with such a filler composition, and such displays a breakdown voltage greater than about 100 V.

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Zorneding, Germany

Ulrich Leute