Humidity sensor with improved protective layering

Electrical resistors – Resistance value responsive to a condition – Gas – vapor – or moisture absorbing or collecting

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733365, 73335, H01L 700

Patent

active

044738137

ABSTRACT:
The invention relates to a humidity sensor of electric resistance type whose electric resistance changes in accordance with an ambient humidity, characterized by a protective film of silicone resin provided on the surface of a humidity-sensitive material, and to a method for preparing the same. The protective film of silicone resin is formed by applying a varnish of siloxanes to the humidity-sensitive material and subjecting the varnish to reaction. The varnish can be of one-part curing system or two-part curing system, and desirably the reaction of siloxanes is a cross-linking reaction. The formed protective film is not influenced by swelling or shrinking of the humidity-sensitive material, and is prevented from flowing off due to a temperature rise, or from deposition of dusts, etc.

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patent: 4167725 (1979-09-01), Shimizu et al.
patent: 4245069 (1981-01-01), Covington
patent: 4386336 (1983-05-01), Kinomoto et al.

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