Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1980-06-09
1982-02-02
Griffin, Ronald W.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 23TN, C08G 1804, C08G 1869
Patent
active
043138586
ABSTRACT:
A thermally-stable polyurethane encapsulating resin system which comprises a polyurethane prepolymer made by reacting a polyisocyanate with a polyol to form an isocyanate-terminated prepolymer. A second component of the system is a curing polyol for reacting with the prepolymer to form a polyurethane polymer having pendant vinyl groups provided by the use in said system of a hydroxy-terminated diene polymer. The system also contains a drying oil having an iodine number of up to about 200 in an amount sufficient to reduce the viscosity of the composition and improve filler loading. The system also contains a peroxide catalyst in an amount sufficient to promote cross-linking of the pendant vinyl groups of the intermediate polyurethane polymer to provide a thermally-stable polyurethane resin product, and promote the reaction of the drying oil into the product during curing.
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Earing Mason H.
Martin Paul F.
Petschke Glenn H.
Griffin Ronald W.
Textron Inc.
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