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Composite Organic Film Formed by Co-electrodeposition of Colloidal SiO2 and Polymer

IP.com Disclosure Number: IPCOM000110508D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Iwasaki, K: AUTHOR [+3]

Abstract

Disclosed is a technique to make a composite film which consists of organic polymeric material and colloidal SiO2. The composite film is applied onto metallic surface by anodic electrodeposion technique and cured under elevated temperature. The film after curing would have resistance against heat and humidity exposure, chemical attack, abrasion, dielectric breakage, and so on.

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Composite Organic Film Formed by Co-electrodeposition of Colloidal SiO2 and Polymer

       Disclosed is a technique to make a composite film which
consists of organic polymeric material and colloidal SiO2.  The
composite film is applied onto metallic surface by anodic
electrodeposion technique and cured under elevated temperature.  The
film after curing would have resistance against heat and humidity
exposure, chemical attack, abrasion, dielectric breakage, and so on.

      Electrodeposition of organic material is widely used in
painting process.  Generally, some kinds of fillers or pigments are
added to electrodeposition solution in order to improve film
properties.  Carbon black and TiO2 are typical fillers used in
electrodeposition solution.  However, when finely mixed composite
film is required, there are some problems with those fillers.
      1) Since typical fillers are electrically neutral, fillers have
no ability to move toward the metal surface to be coated.  Therefore,
fillers themselves cannot be electrodeposited.  The negatively
charged organic polymer molecules take those fillers to the metal
surface to be coated.  The interaction between fillers and organic
polymer comes from weak intermolecular force, such as Van der Waals
force.
      2) Generally, fillers which are dispersed in electrodeposition
solution are much larger than organic polymer molecules.  Typically,
the size of fillers used in commercially available solution is in...