Patent ID: 7485242

Claim:
A reactive fine particle, comprising: at least one latent curing agent selected from the group consisting of a urea derivative, an imidazole, a dicyandiamide (DICY), a mixture thereof and a precursor thereof; and at least one inorganic inert particle selected from the group consisting of a metal oxide, a mineral filler, a natural filler or a mixture thereof, the at least one inorganic inert particle having a specific surface area in the range of about 10 to about 50 m 2 /g, wherein the latent curing agent is entrapped, immobilized, encapsulated, soaked, doped or bonded into the inner portion of the inorganic inert particle or the latent curing agent is coated on the outer rim of the inorganic inert particle, wherein a weight ratio of the at least one latent curing agent to the at least one inert particle is in the range of from 0.01:100 to 50:100, and wherein the reactive fine particle has a maximal size of less than 2 microns.