Chemische Werke Huels Aktiengesellschaft

Otto Hahmann

Albert Frese

Walter Dittmann

Horst Denzel

Johannes Plenikowski

Helmut Klawitter

As insulation for electric cables, there is provided an improved polyolefin having low shrinkage values, high elongation values, even after aging, the desired electrical insulation properties, and comprising partially crystalline, randomly copolymerized polypropylene having a proportion of ethylene, butene-1 and/or 1-hexene incorporated by polymerization of 1-6% by weight, a xylene-soluble proportion of 2-20% by weight, a viscosity value I of 200-400 cc./g., a melt flow index value (MFI.sub.190/5) of 1-20 g./10 min., and an elongation value of above 700%.

Random propylene copolymers for electric cable insulation

Polymer blends comprising a major amount of polybutene-1 with a minor amount of low-pressure polypropylene or ethylene/propylene or butene-1 copolymers exhibit improved physical properties.

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Marl, Germany

Otto Hahmann