FORMULATED POLYURETHANE RESIN COMPOSITIONS FOR FLOOD COATING ELECTRONIC CIRCUIT ASSEMBLIES

Electrical circuit assemblies flood coated with polymeric flood coat compositions as described or exemplified herein are provided. The flood coat composition is characterized as having a sufficient gel time and thixotropic index as to substantially cover or encapsulate the electrical circuit assembl...

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Bibliographische Detailangaben
Hauptverfasser: RICHARD DAVID JORDAN, JR, THOMAS C. SCANLON, IV
Format: Patent
Sprache:eng ; spa
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Zusammenfassung:Electrical circuit assemblies flood coated with polymeric flood coat compositions as described or exemplified herein are provided. The flood coat composition is characterized as having a sufficient gel time and thixotropic index as to substantially cover or encapsulate the electrical circuit assembly as a fixed mass upon cure such that the thickness of the polymeric coating on surfaces horizontal to the assembly is from 20 mils to 75 mils, and the thickness on surfaces vertical to the assembly is from 4 mils to 20 mils. Such flood coated assemblies and devices containing same are advantageous over conventional potting materials or conformal coatings because they require less material thereby reducing weight and cost, and they are able to withstand extreme environmental stresses such as from temperature and/or vibrations. Se proporcionan montajes de circuitos electrónicos recubiertos con composiciones poliméricas de recubrimiento aglutinante como se describe o ejemplifica en la presente. La composición de recubrimiento aglutinante se caracteriza por tener suficiente tiempo de gel e índice tixotrópico como para recubrir o encapsular sustancialmente el montaje de circuito eléctrico como una masa fija luego del curado de manera que espesor en superficies horizontales al montaje sea de (0.508 mm) 20 mils a (1.905 mm) 75 mils, y el espesor en superficies de componentes verticales al montaje sea de (0.1016 mm) 4 mils a (0.508 mm) 20 mils. Los montajes recubiertos y los dispositivos que los contienen son ventajosos en comparación con otros materiales de relleno o recubrimientos aislantes ya que requieren menos material y por lo tanto reducen el peso y el costo, y son capaces de soportar condiciones ambientales extremas, ya sean de temperatura y/o vibración.