Electrets

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 232/08 (2006.01) B03C 3/28 (2006.01) C08F 210/00 (2006.01) C08F 232/04 (2006.01) H01G 7/02 (2006.01)

Patent

CA 2293719

The invention relates to electrets produced on the basis of cycloolefin copolymers (COC) and characterized by long-term stability of the charges applied thereto, even at high temperatures and high relative air humidity. Cycloolefin copolymers to which a positive charge has been applied have lower charge decrease than cycloolefin copolymers with negative charges. Adding polar additives, such as anorganic silicon compounds, affects the time-stability of the applied charges. Films, fibres and tiles produced from electrets can be converted into filters.

L'invention concerne des électrets pouvant être produits à base de copolymères de cyclooléfine, lesdits électrets se distinguant par une stabilité prolongée des charges appliquées, même à de hautes températures et à des degrés élevés d'humidité relative de l'air. Les copolymères de cyclooléfine auxquels a été appliquée une charge positive présentent une diminution des charges plus faible que ceux comportant des charges négatives. L'addition d'additifs polaires, tels que des composés de silicium inorganiques altère la stabilité dans le temps des charges appliquées. Les films, fibres et carreaux produits à partir d'électrets peuvent être transformés en filtres.

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