초록

Microencapsulated materials are released by rupturing of an adhesive layer on a substrate containing the capsules. At least two sheets are secured by the adhesive layer containing the microcapsules. At least one of said two sheets has an adhesive on the outer face of said at least one sheet.

대표청구항 ▼

A label for application to a surface, said label comprising (1) at least two sheets, a top sheet and a bottom sheet, bound by an adhesive composition layer, (2) said adhesive composition layer containing microcapsules with a liquid within the shell of the microcapsules, (3) said microcapsules having

A label for application to a surface, said label comprising (1) at least two sheets, a top sheet and a bottom sheet, bound by an adhesive composition layer, (2) said adhesive composition layer containing microcapsules with a liquid within the shell of the microcapsules, (3) said microcapsules having an average diameter between 4 and 80 micrometers, and (4) said bottom sheet having a pressure-sensitive adhesive on an exterior surface the cohesive strength of the adhesive composition layer being less than the strength of the bond between said adhesive composition and the faces 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 sheets being at least 1.0g/cm and less than 90 g/cm at 20°C. and 50% relative humidity.