Abstract: An electrical insulation tape is disclosed comprising a sheet of mica paper impregnated with a B-staged polybutadiene polymer, a woven glass scrim next to the mica paper, a block copolymer sealing layer next to the glass scrim and optionally a polymeric sealing layer next to the mica. It has been found that the inclusion of about 0.1% to about 0.35% by weight of an organo titanate containing long saturated chains or reactive functional groups impregnated into the mica not only improves the moisture resistance of the tape, and therefore its useful life, but improves the dissipation factor as well.

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.