초록 ▼

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 process for bonding two substrates together which comprises rupturing the encapsulated curing agent particles so as to contact the curing agent with the prepolymer in

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 process for bonding two substrates together which comprises rupturing the encapsulated curing agent particles so as to contact the curing agent with the prepolymer in the adhesive composition, contacting the adhesive composition of the invention with at least one of the substrates and contacting the substrates together along the portion of the substrate(s) to which the adhesive has been applied before the adhesive applied cures and allowing the adhesive to cure and bond the substrates together.

대표청구항 ▼

[ What is claimed is:] [1.] 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, where

[ What is claimed is:] [1.] 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.