Electrically insulated metallic surfaces with interior corners

Details Electrically insulated metallic surfaces with interior corners Electrically insulated metallic surfaces with interior corners

C - Chemistry, Metallurgy

09

D

C09D 133/02 (2006.01) B05D 3/02 (2006.01) B05D 7/14 (2006.01) B05D 7/16 (2006.01) C09D 5/08 (2006.01) C09D 133/06 (2006.01) C09D 133/18 (2006.01) C09D 133/26 (2006.01)

Patent

CA 2247507

An effective electrically insulating film (4) on the surface of a metal object, such as a common type of electric motor core assembly, in which the surface includes an interior corner on which insulation (4) is desired, can be formed by autodeposition with an adequate thickness in the interior corner without need for excessive thickness on the other parts of the surface that are more readily covered by prior art methods of applying an insulating coating (4). If the autodeposition composition used includes as its primary film-forming component a copolymer of certain acrylic monomers, a very high volume resistivity can be achieved.

Cette invention se rapporte à un film (4) efficace en tant qu'isolant électrique, disposé à la surface d'un objet métallique, tel qu'un noyau de moteur commun, dont la surface comporte un angle interne sur lequel on désire former un revêtement isolant (4). On peut provoquer la formation dudit film par auto-dépôt sur une épaisseur appropriée au niveau de l'angle interne sans qu'il soit nécessaire de recouvrir d'une épaisseur excessive les autres parties de la surface que l'on peut aisément recouvrir au moyen de procédés conformes à l'art antérieur de la technique et relatifs à la formation d'un revêtement isolant (4). Lorsque la composition susceptible de former un auto-dépôt comporte en tant que composant primaire destiné à former le film, un copolymère composé de certains monomères acryliques, il est possible d'obtenir un revêtement de très grande résistivité.

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