| 摘要 |
<p>The invention is an adhesive system comprising a cohesive material dispersed in a nonadherent material. The nonadherent material reduces the coefficient of friction of the cohesive material and renders the cohesive material non-coherent. The adhesive system also contains a plurality of microcapsules associated with the nonadherent material and the cohesive material. The microcapsules encapsulate a solvent for the cohesive and are rupturable upon the application of pressure. The microcapsules rupture and release the solvent and the solvent dissolves the cohesive material such that the cohesive material becomes coherent. The invention further comprises a tamper-evident envelope having a layer of adhesive thereon, wherein the adhesive provides cohesion between two portions of the envelope and wherein the adhesive comprises the above system and a method of providing tamper-evident adhesion between the two united portions of an envelope.</p> |
