Copolymers for wire and cable applications
AssigneeIneos Europe AG
InventorsDominique Jan, Yves-Julien Lambert
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Abstract
Power wire or cables comprise polyethylene compositions prepared by use of a single site catalyst system and in particular comprise copolymers of ethylene and α-olefins prepared by use of metallocene catalyst systems. The polyethylene compositions deliver a unique combination of mechanical properties and processing behaviour. They are particularly suitable for insulating layers in low and medium voltage applications as well as for jacketing layers.
Claims28
1-27. (canceled)
An insulating or a jacketing layer for wire or cable comprising as a base resin a copolymer of ethylene and alpha-olefin having the following properties as determined on said base resin prior to any reticulation or crosslinking:
- (i) a density in the range 0.900 to 0.940 g·cm−3,
- (ii) a melt index (190° C./2.16 kg), MI2 from 4 to 8 g/10 min, and
- (iii) a comonomer distribution (CDBI) of >60%.
A copolymer suitable for use in wire and cable applications comprising ethylene and alpha olefin said copolymer having
- (i) a density in the range 0.900 to 0.940 g·cm−3,
- (ii) a melt index (190° C./2.16 kg), MI2 from 4 to 8 g/10 min,
- (iii) a comonomer distribution (CDBI) of >60%, and
- (iv) a melt index ratio (I21/I2) in the range 19-29.
Dependencies are inferred from the claim text.