Polyurethane hot melt adhesive
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United States of America Patent
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Apr 8, 1997
Grant Date -
N/A
app pub date -
Dec 29, 1993
filing date -
Dec 29, 1993
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Expired
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Abstract
Described herein is a one-part hot melt adhesive comprising the reaction product of: (a) a polyester polyol with an equivalent weight in the range of from about 250 to about 3,000; (b) a polyisocyanate; and (c) at least about 1 weight percent hydroquinone bis (2-hydroxyethyl) ether; wherein the isocyanate content of the resulting product is at least about 0.5 percent. Also described is a one-part hot melt adhesive comprising the reaction product of: (a) a polyether polyol; (b) a polyisocyanate; and (c) hydroquinone bis (2-hydroxyethyl) ether; wherein the isocyanate content of the resulting product is at least about 0.5 percent. It has been discovered that the compositions of the invention provide adhesives with increased resistance to softening at high temperatures (e.g., above about 70.degree. C.) after curing. Such adhesives have a variety of uses in applications wherein the applied adhesive is exposed to high temperatures, but are particularly useful in automotive applications, wherein the exterior or interior of the automobile may be exposed to such temperatures.
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