H - Electricity – 05 – K
Patent
H - Electricity
05
K
356/1, 117/195,
H05K 3/28 (2006.01) C08K 3/36 (2006.01) H01L 23/29 (2006.01) H05K 3/00 (2006.01) H05K 3/34 (2006.01)
Patent
CA 1144293
ABSTRACT OF THE DISCLOSURE A printed circuit board with electronic compo- nents wired thereto has a conformal insulating coating consisting of a single component of essentially pure urethane formulation and a minor amount of fumed colloi- dal silica powder. The insulating coating covers as- perities and protrusions as well as the conductors and circuit components while maintaining a transparent characteristic. The coating material is made by mixing of the small proportion of silica with essentially pure urethane formulation under controlled conditions to pre- vent moisture contamination of the materials. The mix- ture is thoroughly mixed, deserted under reduced pres- sure with a pulsating pressure to break any air bubbles and remove essentially all air. The coating is applied in an environment having at least 30 percent relative humidity and within a confined area defined by an encir- cling dam masking compound. The coating is allowed to partially cure at room temperature and the confining dam compound removed. For maximum protection, a further period of curing of one week is provided.
355885
Johnson Controls Inc.
Marks & Clerk
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