Stable electrets of styrene-type polymers

Details Stable electrets of styrene-type polymers Stable electrets of styrene-type polymers

C - Chemistry, Metallurgy

08

F

31/164, 402/572

C08F 12/06 (2006.01) H01G 7/02 (2006.01)

Patent

CA 1068445

Abstract of the Disclosure An electret made of styrene-type polymer (e.g., polystyrene), having a volume resistivity of at least 1016 ohm-cm and a glass transition temperature above 50°C, and containing not more than 1% by weight of electron-donor impurities and not more than 0.5% by weight of electron-acceptor impurities, said electret being capable of retaining at least 75% of its charge after exposure to a temperature of 50°C and a relative humidity of 100% for 100 days.

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