Method for adhering a polyurethane to a polymeric substrate
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United States of America Patent
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-
Apr 11, 2000
Grant Date -
N/A
app pub date -
Mar 20, 1998
filing date -
Sep 20, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method of bonding a polyurethane surface to a polyvinyl chloride or other polymer substrate containing surface moisture, particularly useful for making chip cards. A resin comprising a polyol and a diisocyanate is placed on the substrate, followed by pressing, in the presence of a tertiary amine catalyst able simultaneously to catalyze the reaction of the polyol with the diisocyanate to form a polyurethane network and the reaction of the surface moisture with the diisocyanate to convert water molecules into polyurea.
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