Moisture-curing, hot-melt polyurethane adhesive compositions
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United States of America Patent
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Nov 30, 1993
Issued Date -
N/A
app pub date -
Mar 29, 1993
filing date -
May 19, 1989
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Expired
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Abstract
A moisture-curing hot-melt polyurethane adhesive foam comprising isocyanate-terminated polyurethane prepolymers based on polyester or polyether and having a melting point of 40.degree. to 60.degree. C. or a glass transition point above room temperature, melted together, optionally with a nucleating agent and/or a surfactant, treated with an inert gas under pressure and released in ambient pressure is allowed to cure as a foam whereby a cure rate is achieved of at least ten times that of the composition when not foamed; extremely rapid cure rates are achieved and thick bond lines are readily obtained.
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