Tracking resistant electrical insulating material suitable...

Details Tracking resistant electrical insulating material suitable... Tracking resistant electrical insulating material suitable...

C - Chemistry, Metallurgy

08

L

C08L 51/06 (2006.01) C08L 23/26 (2006.01) H01B 3/44 (2006.01) H01B 7/28 (2006.01)

Patent

CA 2290317

A tracking resistant electrical insulating material or article suitable for high voltage applications comprising a silane-grafted polyolefin or olefin-silane copolymer; and a heat- shrinkable article prepared therefrom. Said material is preferably prepared by a process comprising: reacting a first polyolefin with a silane in the presence of a free-radical initiator to form a silane-grafted resin, or copolymerising a polyolefin with silane; preparing a mixture of the first silane-modified resin with optional one or more non silane-modified polyolefins, and a silanol condensation catalyst; forming the insulating material or article by melt extruding or moulding said mixture; and crosslinking the insulating material or article by exposing it to combined heat and moisture. The silane-modified, moisture-crosslinkable polyolefin provides the insulating material with high resistance to tracking even in the absence of conventional anti-tracking fillers.

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