Pressure-sensitive adhesive formulation comprising underindexed isocyanate to active hydrogen composition
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United States of America Patent
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Oct 20, 1992
Grant Date -
N/A
app pub date -
Jun 4, 1990
filing date -
Jun 4, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pressure-sensitive adhesive prepared from a two-package polyurethane system; the two packages comprise an isocyanate reactant and an active hydrogen reactant. The reactants are characterized by a molar insufficiency of isocyanate and at least some tri- or higher-functionality in either the active hydrogen or the isocyanate reactant, or both. The underindexing should range from 0.4 to 0.75 when the higher functionality reactant has a functionality of 2.1, and should range from 0.3 to 0.7 when the higher functionality reactant has a functionality of 4, with linearly extrapolated values in between. Pressure sensitive adhesives prepared from this system provide comparable shear resistance as do solvent-system polyurethane adhesives, without the worksite and environmental problems associated with such solvent systems.
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