Adhesive sheet

Abstract

An adhesive sheet comprising a substrate and an adhesive layer formed on at least one side of the substrate, characterized in that an adhesive agent contained in the adhesive layer comprises an acrylic ester copolymer and a citrate plasticizer; the acrylic ester copolymer has a glass transition temperature of -45 DEG C or less; the citrate plasticizer is contained in an amount of 1.0 to 50.0 parts by mass (solid content), with respect to 100 parts by mass (solid content) of the acrylic ester copolymer; and a rate of a gel content in the adhesive agent in the adhesive layer is 70% or more, is disclosed. The adhesive sheet according to the present invention has a slightly-adhesive property and a removable property, and can be suitably used, for example, as a carrier sheet.

Description

technical field

[0001] The present invention relates to an adhesive sheet. The adhesive sheet of the present invention can be used as an engineering sheet in the processing technology of flexible printed substrates (FPC) due to its moderate adhesive performance and excellent re-peelability, or in reflective films and diffuser films for optical applications. Advantageously used as an engineered sheet in the peeling process. Background technique

[0002] With the thinning and miniaturization of flexible printed circuit boards (FPCs) in recent years, the thinning of films such as copper clad laminates (CCL) and polyimide films used in them is also progressing. Therefore, the rigidity of these films itself decreases, and processing at the time of manufacturing FPC becomes difficult. Therefore, the widely adopted scheme is to ensure the rigidity of the whole by pasting these FPC films on the engineering sheet before processing, so that the operation during processing is simple ...