Insulating mica paper and tapes thereof
AssigneeEssex Group, Inc.
InventorsRonald W. Staley, Jonathan W. Roberts
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Abstract
An electrical insulation material comprising a B-staged hydrocarbon elastomer impregnated mica paper is described. This material combined with a glass scrim and a plurality of polymeric sealing layers provides electrical insulation tape with superior properties. The conformable mica insulation tape is characterized by high flexibility, high conformability, and improved electrical insulating and stability properties. Upon wrapping to such things as electrical coils and subsequently curing, the tape provides excellent electrical properties and high heat resistance. The tape is sealable and especially adapted to stringent, for example, high temperature, environments.
Claims5
An electrical insulation tape comprising:
- (a) a sheet of mica paper impregnated with 10 to 35% by weight of a B-staged polybutadiene polymer;
- (b) a woven glass scrim next to the mica paper;
- (c) a block copolymer sealing layer selected from the group consisting of an isoprene-butadiene and styrene-butadiene next to the glass scrim;
- and
- (d) a polyethyleneterephthlate sealing layer next to the mica on that side of the mica opposite the glass scrim.
Dependencies are inferred from the claim text.