Title: Technique for electrodeposition of water-based polymeric coating

Abstract: A water-based polymeric coating comprising a novolak resin is deposited electrolytically from a solution of a novolak resin upon a conductive substrate at an initial current density ranging from 10-30 milliamperes per square centimeter. The resultant coating, after cross linking by subsequent chemical treatment, is flexible, firmly adherent and evidences good thermal stability and insulation characteristics, so suggesting its use as a cover coat for printed circuits.

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Inventors: Chandross, Edwin A. (Berkeley Heights, NJ, US)
Freed, Donald J. (Westfield, NJ, US)

Application Number: 775770
Filing Date: 1977-03-09
Publication_date: 1979-01-02
Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ)
Primary Class(es): 205/125 205/138, 205/224, 205/229, 205/317
Other Classes:
US Patent Ref:

3547790	Dec, 1970	Dannels et al.	204/27.
3809634	May, 1974	Brown et al.	204/181.
3984382	Oct, 1976	Parekh et al.	204/56.
4000045	Dec, 1976	Rotzow	204/15.

Other Refs:
Primary Examiner: Williams, Howard S.
Assistant Examiner:
Attorney: Fink; Edward M.