Crosslinked, melt-shaped articles and compositions for producing same

摘要

Disclosed is a crosslinkable mixture comprising a polyolefin, an alkoxysilane, an organopolysiloxane, a free radical initiator and a liquid polymer modifier. The organopolysiloxane contains two or more hydroxyl end groups. When the crosslinkable mixture is melt-shaped, a unique crosslinked composition is formed. The liquid polymer modifier improves flexibility of the melt-shaped article without decreasing dielectric strength.

主权项

1. A melt-shaped article comprising:
a first molded layer; a second molded layer; an insulation layer comprising a crosslinked polyethylene composition injected between the first molded layer and the second molded layer; the crosslinked polyethylene composition comprising (i) a catalyst, (ii) an organopolysiloxane and (iii) a liquid polymer modifier that is a phthalate-free non-functionalized hydrogenated C8 to C12 poly-alpha-olefin; wherein the liquid polymer modifier is present to the exclusion of mineral oil and paraffin oil, the crosslinked polyethylene composition comprises (a) a silane-grafted polyethylene and (b) polysiloxane linkages between the polymer chains of the silane-grafted polyethylene, the polysiloxane linkages having the structure (I)wherein n=1 to 100,000, and
the insulation layer has an alternating current breakdown strength (ACBD) greater than 34 kV/mm as determined in accordance with ASTM D 149.