Adhesive composition, the adhesive sheet, an electronic device and a manufacturing method thereof

The present invention, the content of the repeating unit derived from isoprene is from 0.1 to 99 mol% based on all repeating units, mainly containing isobutylene-isoprene copolymers, for sealing the electronic device the adhesive composition; and a release sheet, an adhesive sheet having an adhesive layer formed 該剥 release sheet, the adhesive layer is one formed by using the adhesive composition adhered sheet; a gas barrier film, wherein with an adhesive layer formed on the gas barrier film, the gas barrier film, the temperature 40 ° C., water vapor permeability at relative humidity of 90% or less 0.1g / m 2 / Over DOO; and, the adhesive composition and the adhesive sheet is an electronic device or the like using as a sealing material such as an organic EL element. According to the present invention, excellent moisture barrier properties, and useful adhesive composition as the material for forming the adhesive layer excellent in adhesion, the adhesive sheet, an electronic device or the like is provided.