Film capacitor and method for manufacturing the same

H - Electricity – 01 – G

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H01G 4/18 (2006.01) H01G 2/10 (2006.01) H01G 2/12 (2006.01) H01G 4/00 (2006.01) H01G 4/015 (2006.01) H01G 4/06 (2006.01) H01G 4/20 (2006.01)

Patent

CA 2086395

A film capacitor having excellent moisture resistance includes a capacitor element having (a) a multilayer structure made of stacked dielectric films or a wound dielectric film, each dielectric film having a metallic layer formed on its surface, and (b) a pair of outer electrodes electrically connected to the metallic layer, and a coating layer covering the capacitor element. The coating layer is made from at least one polysiloxane, at least one organometallic compound or a combination of the polysiloxane and the organometallic compound, wherein the organometallic compound is selected from the group consisting of organoaluminum compounds, organosilicon compounds, organotin compounds and organotitanium compounds. The organometallic compound has at least one functional group attached to the metallic atom of the organometallic compound, the functional group of which is reactive to inorganic and organic materials and represented by the formula -OR, wherein R is selected from the group consisting of hydrogen, hydrocarbyl, oxygen-containing hydrocarbyl, nitrogen-containing hydrocarbyl and oxygen- and nitrogen-containing hydrocarbyl.

L'invention est un condensateur à films ayant une excellente résistance à l'humidité. Ce condensateur comporte un élément capacitif ayant a) une structure multicouche faite de films diélectriques empilés ou d'un film diélectrique enroulé, chaque film diélectrique portant une couche métallique sur sa surface et b) une paire d'électrodes externes connectées électriquement à la couche métallique, et une couche de recouvrement de l'élément capacitif. Cette couche de recouvrement est faite d'au moins un polysiloxane, d'au moins un composé organométallique ou d'une combinaison du polysiloxane et du composé organométallique, ce dernier étant choisi parmi le groupe constitué des composés d'organoaluminium, d'organosilicium, d'organoétain et d'organotitane. Le composé organométallique comporte au moins un groupe fonctionnel fixé à l'atome de métal du composé organométallique, dont le groupe fonctionnel réagit avec les substances inorganiques et organiques et est représenté par la formule -OR où R est choisi parmi le groupe constitué par l'hydrogène, les hyrocarbyles, les hydrocarbyles contenant de l'oxygène, les hydrocarbyles contenant de l'azote et les hydrocarbyles contenant de l'oxygène et de l'azote.

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