Abstract: An information protection label in which information becomes visually unrecognizable by a simple process, and a product with the information protection label pasted thereon are disclosed. The information protection label (1) comprises a base material layer (4) comprising an information display part (2) for displaying information and a base material (3), and an adhesive layer (5). The base material layer (4) comprises a material which changes in quality so that the information becomes visually unrecognizable by an autoclave process. The product with the information protection label (1) pasted thereon is preferably a biological sample container, a blood transfusion bag, an infusion bottle, a medical container such as a box containing a medicine, or a medical device, which are used for academic research, examination, treatment or the like.

Abstract: A pressure-sensitive adhesive including an aliphatic polycarbonate as an adhesive component, wherein the aliphatic polycarbonate has no carboxylic acid ester bond or urethane bond in the main chain thereof; and a pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer obtained by using the pressure-sensitive adhesive.

Abstract: The present invention relates to a (meth)acrylic emulsion type adhesive composition comprising an emulsion type (meth)acrylic polymer obtained by emulsion-polymerizing a monomer comprising a (meth)acrylic monomer as a principal component, wherein a sodium salt and/or potassium salt-containing emulsifier is used in the emulsion-polymerization described above, and neutralization treatment is carried out by using a neutralizing agent containing sodium hydroxide and/or potassium hydroxide after the emulsion polymerization is finished and an adhesive sheet obtained by using the above composition, and the present invention provides an adhesive composition which is not yellowed with the passage of time, particularly by heating and an adhesive sheet obtained by using the above composition.

Abstract: There is disclosed an adhesive sheet comprising an adhesive agent layer formed on a support film containing a plasticizer, and composed of an emulsion which is obtained by subjecting a mixture of ethylenically unsaturated monomers containing components (a) at least 48% by mass of butyl(meth)acrylate, (b) 6 to 22% by mass of methyl methacrylate and (c) 0.5 to 5% by mass of an ethylenically unsaturated carboxylic acid to emulsion polymerization in the presence of a reactive emulsifier in an amount of 0.5 to 5.0 parts by mass based on 100 parts by mass of the mixture of ethylenically unsaturated monomers, and which comprises a polymer having an average particle diameter in the range of 100 to 300 nm.