Polyurethane hot melt adhesive

Details Polyurethane hot melt adhesive Polyurethane hot melt adhesive

1993-12-29

1997-04-08

Sergent, Rabon

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 76, 528 77, 528 79, 528 80, 528 83, 528 85, 528905, C09J17506, C09J17508, C08G 1832

Patent

active

056189044

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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