초록

Microencapsulated materials are released by rupturing of an adhesive layer on a substrate containing the capsules.

대표청구항 ▼

A device for exposing a liquid, said device comprising (1) at least two surfaces of coated paper bound by an adhesive composition layer, (2) said adhesive composition layer containing microcapsules with said liquid within the shell of the microcapsules, and (3) said microcapsules having an average d

A device for exposing a liquid, said device comprising (1) at least two surfaces of coated paper bound by an adhesive composition layer, (2) said adhesive composition layer containing microcapsules with said liquid within the shell of the microcapsules, and (3) said microcapsules having an average diameter between 4 and 80 micrometers, the cohesive strength of the adhesive composition layer being less than the strength of the bond between said adhesive composition and a coated face of said sheets, the tensile rupture strength of said microcapsules being such that the cohesive failure of the adhesive results in breakage of the microcapsules, and the tensile rupture strength between said two surfaces being at least 4.0 g/cm and less than 90 g/cm at 20°C. and 50% relative humidity and greater than 4.0 g/cm after storage at 120°C. and less than 1% relative humidity for seventy-two hours.