Abstract: The present application provides a re-releasable aqueous pressure-sensitive adhesive composition containing: as a main component, an emulsion [A] of a (meth)acrylic acid-based ester copolymer, an emulsion [B] of a (meth)acrylic acid-based ester copolymer, and a crosslinker [C]. The emulsion [A] contains a constituent unit that has a carboxy group or a hydroxy group and reacts with a crosslinker. The emulsion [B] is included in the composition in an amount of 0.6 parts by mass or more in terms of a solid content based on 100 parts by mass of a solid content of the emulsion [A] and functions as a crosslinking assistant. The emulsion [B] has a peculiar structure dissolving in water upon neutralization and is unmeasurable in a particle diameter distribution analysis at pH from 6.5 to 7.5. The crosslinker [C] is a hydrazide-based compound that is soluble or dispersible in water.

Abstract: The present invention provides an aqueous pressure-sensitive adhesive composition that has excellent environmental friendliness, that needs no aging, that can be made into a one-pack type which is highly convenient, and that is capable of forming a pressure-sensitive adhesive layer which has no problem not only in initial pressure-sensitive adhesive force but also in pressure-sensitive adhesive force with time and which exhibits satisfactory re-releasability. The present invention is a re-releasable aqueous pressure-sensitive adhesive composition containing: as a main component, an emulsion [A] of a (meth) acrylic acid-based ester copolymer, the emulsion [A] containing a constituent unit that has a carboxy group or a hydroxy group and that reacts with a crosslinker; an emulsion [B] of a (meth) acrylic acid-based ester copolymer in an amount of 0.

Abstract: The present invention provides a moisture-absorbent formed body comprising 1) an amine compound and/or a thermally conductive material, 2) a hygroscopic agent, and 3) a resin component, for removing moisture from within the sealed atmosphere of an organic electroluminescent device, and thereby suppressing the occurrence of dark spots.

Abstract: The present invention provides a moisture-absorbent formed body comprising 1) an amine compound and/or a thermally conductive material, 2) a hygroscopic agent, and 3) a resin component, for removing moisture from within the sealed atmosphere of an organic electroluminescent device, and thereby suppressing the occurrence of dark spots.