The present invention provides: an adhesive composition for sealing an electronic device, the adhesive composition comprising an isobutylene-isoprene copolymer as a main component, the isobutylene-isoprene copolymer having a content of repeating units derived from isoprene of 0.1 to 99 mol% based on total repeating units; an adhesive sheet comprising a gas barrier film, and an adhesive layer that is formed on the gas barrier film, the gas barrier film having a water vapor transmission rate at a temperature of 40°C and a relative humidity of 90% of 0.1 g/m²/day or less, and having a total light transmittance of 80% or more, and the adhesive layer comprising an adhesive composition that comprises an isobutylene-isoprene copolymer as a main component; and an electronic device or the like in which the adhesive composition and the adhesive sheet are used as a sealant for an organic electroluminescent element or the like. According to the present invention, provided are :an adhesive composition that is useful as a material for forming an adhesive layer that exhibits an excellent water barrier capability and excellent adhesion; an adhesive sheet; and an electronic device or the like.

The present invention relates to a tape comprising a single layer comprising a crosslinked polymer, selected from the group consisting of crosslinked polyurethane, crosslinked polyurea, and crosslinked mixed polyurethane/polyurea polymer, and an adhesive layer.

The tape may be used as erosion resistant protective films which may be used on aerodynamic surfaces in conjunction with de-icing apparati.

The present invention relates to a multilayer pressure sensitive adhesive (PSA) film having adhesive properties at its first and second main surface, wherein the film comprises at least two superimposed layers of a polymeric pressure sensitive adhesive foam material and optionally one or more intermediate layers of a polymeric foam material, characterized in that the PSA film is obtainable by a continuous self-metered process comprising the steps of

(a) providing a substrate,

(b) providing two or more coating knives which are offset, independently from each other, from said substrate to form a gap normal to the surface of the substrate,

(c) moving the substrate relative to the coating knives in a downstream direction,

(d) providing curable liquid precursors of the polymeric pressure sensitive adhesive foam materials and optionally of the polymeric foam material to the upstream side of the coating knives thereby coating the two or more precursors through the respective gaps as superimposed layers onto the substrate,

(e) optionally providing one or more protective liners and applying these along the upstream side of the coating knives, and

(f) curing the precursor of the multilayer film thus obtained, wherein a lower layer of the curable liquid precursor is covered by an adjacent upper layer of the curable liquid precursor, essentially without exposing said lower layer of a curable liquid precursor.

A double-sided heat-sensitive adhesive sheet comprises a support provided with a release layer on one side thereof and heat-sensitive adhesive layers which are formed on both sides of the support and have sufficient adhesion to the support but can be easily peeled apart from the release layer, wherein the release layer and the heat-sensitive adhesive layer has at their interface a 180° peeling resistance of 10-30 g/50 mm in a peel test performed at a peeling speed of 500 mm/min. in an atmosphere of 20°C and 65 % RH.

The adhesive sheet is interposed between each opposed pair of information-recorded faces of recording material having on one side at least two spaces for information-recording, and heat is applied to the resultant assembly to make a laminate. The laminate can have a size and weight suitable for mailing as a postcard, and can bear confidential information on the inside and be peeled apart when desired.

A double-sided heat-sensitive adhesive sheet comprises a support provided with a release layer on one side thereof and heat-sensitive adhesive layers which are formed on both sides of the support and have sufficient adhesion to the support but can be easily peeled apart from the release layer, wherein the release layer and the heat-sensitive adhesive layer has at their interface a 180° peeling resistance of 10-30 g/50 mm in a peel test performed at a peeling speed of 500 mm/min. in an atmosphere of 20°C and 65 % RH.

The adhesive sheet is interposed between each opposed pair of information-recorded faces of recording material having on one side at least two spaces for information-recording, and heat is applied to the resultant assembly to make a laminate. The laminate can have a size and weight suitable for mailing as a postcard, and can bear confidential information on the inside and be peeled apart when desired.

A wafer processing film is provided on one side of a base film (1) with a pressure-sensitive adhesive layer (2) and with a release film (3) on the surface of the pressure-sensitive adhesive layer, and coated on the back side of the base film (1) is a phosphoric surfactant (4) wherein ionic components are present in an amount so low as to be undetectable by ion chromatography. The wafer processing film can prevent failure of an integrated circuit by static electricity generated in the handling of the wafer processing film and can also inhibit contamination and corrosion of the wafer by surfactant.