Polyurethane conformal coating process for a printed wiring boar

Details Polyurethane conformal coating process for a printed wiring boar Polyurethane conformal coating process for a printed wiring boar

1996-01-23

1999-01-26

Beck, Shrive

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427 98, 4274432, 174260, 174254, 174255, 174256, B05D 512, H05K 103, H05K 107

Patent

active

058635971

ABSTRACT:
A cost-effective process for preventing mealing of a polyurethane conformal coating applied to a printed wiring board is described. The process includes utilizing a liquid photoimagable solder mask for protecting the circuitry within the board prior to applying the polyurethane conformal coating. The process further includes applying the polyurethane coating within a controlled maximum thickness of 0.0015 inches for preventing vesication of the conformal coating. Additionally, a manufactured printed circuit substrate incorporating these steps is described.

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Publication entitled "Introduction to Conformal Coatings" dated Sep. 1992 pp. 1-16; Chase Corporation--Humiseal.RTM. Protective Coatings.
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"International Photopolymers News",vol. 3, No. 3 Fall 1995 published by Ciba-Geigy Corporation pp. 1-12.

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