Catalyzed fast cure polyurethane sealant composition
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United States of America Patent
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Aug 28, 1990
Issued Date -
N/A
app pub date -
Dec 7, 1988
filing date -
Mar 25, 1987
priority date (Note) -
Expired
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Abstract
A polyurethane sealant composition is made from a polyurethane prepolymer having blocked isocyanate groups. A bicyclic amidine catalyst is utilized in association with an amine curing agent having at least two primary amine groups to achieve a relatively fast cure time. In the first embodiment, the catalyst is 1,8-diazobicyclo (5:4:0) undecene-7 (DBU), whereas in a second embodiment the catalyst is 1,5-diazobicyclo (4:3:0) non-5-ene (DBN).
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