One-part moisture curable polyurethane adhesive
AssigneeThe Dow Chemical Company
InventorsShailesh S. Bhat, Sidky D. Rizk
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Abstract
The present invention is a polyurethane prepolymer comprising the reaction product of: A) a polyisocyanate; B) one or more compounds or polymers having isocyanate-reactive moieties; C) a dispersion triol containing from about 10 to about 60 percent by weight based on the dispersion of particles of an organic polymer which is nonreactive with the polyols and polyisocyanates having a particle size of from about 5 to about 50 microns; wherein the prepolymer has a free isocyanate content of from about 0.8 to about 2.2 percent. In another embodiment the invention is a one-part adhesive composition comprising the polyurethane prepolymer of the invention and a catalyst capable of catalyzing the reaction of isocyanate moieties with water.
Claims10
A polyurethane prepolymer comprising the reaction product of:
- A) one or more polyisocyanates;
- B) a mixture of one or more polyether diols and one or more polyether triols;
- C) a dispersion triol, wherein the triol is a polyoxyalkylene triol having a molecular weight of about 4000 to about 8000 and having a hydroxyl number of from about 30 to about 75, containing from about 10 to about 60 percent by weight based on the dispersion of organic polymer particles having a particle size of from about 10 to about 50 microns and which are not reactive with isocyanate or isocyanate-reactive moieties wherein the organic polymer is a polymer derived from styrene, halo or alkyl substituted styrene;
- or a rubber-modified polymer derived from styrene, or halo or alkyl substituted styrene;
- wherein the prepolymer has a free isocyanate content of from about 0.8 to about 2.2 percent.
A one-part adhesive composition comprising a polyurethane prepolymer comprising the reaction product of;
- A) one or more polyisocyanates;
- B) a mixture of one or more polyether diols and one or more polyether triols;
- C) a dispersion triol containing from about 10 to about 60 percent by weight based on the dispersion of organic polymer particles having a particle size of from about 10 to about 50 microns and which are not reactive with isocyanate or isocyanate-reactive moieties wherein the organic polymer is derived from styrene, halo or alkyl substituted styrene;
- or a rubber modified polymer derived from styrene, or halo or alkyl substituted styrene;
- and a catalyst comprising a mixture of a dimorpholino diethyl ether or a alkyl substituted dimorpholino diethyl ether and a bismuth carboxylate;
- wherein the prepolymer has a free isocyanate content of from about 0.8 to about 2.2 percent.
Dependencies are inferred from the claim text.