Random propylene copolymers for electric cable insulation

Details Random propylene copolymers for electric cable insulation Random propylene copolymers for electric cable insulation

1978-04-06

1981-03-31

Michl, Paul R.

Stock material or miscellaneous articles

Composite

Of metal

174110SR, 427117, B32B 1508

Patent

active

042594103

ABSTRACT:
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%.

REFERENCES:
patent: 3793473 (1974-02-01), Pointer
patent: 3959409 (1976-05-01), Frese et al.
patent: 4000354 (1976-12-01), Baxmann et al.
patent: 4008200 (1977-02-01), Avar et al.
patent: 4012399 (1977-03-01), Hechenbleikner et al.
patent: 4101512 (1978-07-01), Schmidt et al.

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