Patent ID: 6133398
Filing Date: 2000-10-17
Classification: C08G,C09J

Abstract:
A one-part adhesive composition comprisingA) an isocyanate functional polyurethane prepolymer comprising the reaction product of;i) one or more polyisocyanates;ii) a mixture of one or more polyether diols and one or more polyether triols; andiii) 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 stryrene, halo or alkyl substituted styrene; or a rubber-modified polymer derived from styrene or halo or alkyl substituted styrene;B) a catalyst capable of catalyzing the reaction of isocyanate moieties with isocyanate reactive moieties; andC) particles having a particle size of about 10 microns or greater comprising a curing agent for an isocyanate functional polyurethane prepolymer encapsulated within a coating material wherein the curing agent is a polyol, polyamine, polymercaptan, polyacid, compound containing at least one oxazolidine moiety, water or a mixture thereof, and the coating material for the particles comprise a material which is insoluble with respect to the curing agent and the prepolymer and has a melting point of from about 40 to about 200.degree. C.;wherein the prepolymer has a free isocyanate content of from about 0.8 to about 2.2 percent.