Abstract: The present embodiments provide a light wavelength conversion medium excellent in emission intensity and durability, and also a light wavelength conversion medium-forming composition used for forming that medium. The conversion medium according to the embodiment comprises a rare earth complex comprising a rare earth ion and a nonionic ligand, a nonionic compound substitutable for the nonionic ligand, and a polymer or a solvent.

Abstract: A personal authentication medium includes a substrate, and a pearl pigment ink image layer formed on the substrate by using heat transfer fusion inks containing pearl pigments. The distance between the centers of dots or lines forming the pearl pigment ink image layer is 0.5 to 100 times the largest one of the average grain sizes of the pearl pigments used. Each heat transfer fusion ink contains a pearl pigment having an interference light color corresponding to one of the three additive primary colors or one of the three subtractive primary colors.

Abstract: A heat transfer recording medium includes a protective layer containing mainly a polyvinylbutyral resin, phenoxy resin, or polyvinylacetal resin, an adhesive layer having a glass transition point Tg1 falling within the range Tg1?T?80° C., an ink image receiving layer/adhesive layer having a glass transition point Tg2 falling within the range 60° C.?Tg2?Tg?50° C., and a hot-melt ink image receiving layer/adhesive layer in which a first resin component having a number-average molecular weight of 16,000 or more and a glass transition point of Tg?80° C. or less and a second resin component having a number-average molecular weight of 16,000 or less and a glass transition point of Tg?50° C. or more are mixed at a weight ratio of 1:9 to 5:5.

Abstract: A heat transfer recording medium includes a protective layer containing mainly a polyvinylbutyral resin, phenoxy resin, or polyvinylacetal resin, an adhesive layer having a glass transition point Tg1 falling within the range Tg1?T?80° C., an ink image receiving layer/adhesive layer having a glass transition point Tg2 falling within the range 60° C.?Tg2?Tg?50° C., and a hot-melt ink image receiving layer/adhesive layer in which a first resin component having a number-average molecular weight of 16,000 or more and a glass transition point of Tg?80° C. or less and a second resin component having a number-average molecular weight of 16,000 or less and a glass transition point of Tg?50° C. or more are mixed at a weight ratio of 1:9 to 5:5.

Abstract: A heat transfer recording medium includes a protective layer containing mainly a polyvinylbutyral resin, phenoxy resin, or polyvinylacetal resin, an adhesive layer having a glass transition point Tg1 falling within the range Tg1≦T−80° C., an ink image receiving layer/adhesive layer having a glass transition point Tg2 falling within the range 60° C.≦Tg2≦Tg−50° C., and a hot-melt ink image receiving layer/adhesive layer in which a first resin component having a number-average molecular weight of 16,000 or more and a glass transition point of Tg−80° C. or less and a second resin component having a number-average molecular weight of 16,000 or less and a glass transition point of Tg−50° C. or more are mixed at a weight ratio of 1:9 to 5:5.