Abstract: A thermal printing medium having high mechanical strength, and a label and tag incorporating such a thermal printing medium is disclosed. In additional to high mechanical strength, the thermal printing medium of the present invention provides for excellent printing density and reslution, for which reason the medium is very applicable to bar codes and the like. The thermal printing medium which includes a multilayer structure consisting of a support substrate comprised of polyolefin type cross-laminate film; a thermal developing layer over the above mentioned under layer, comprised chiefly of colorless or lightly colored leuco-type dye and color developer agent; and a protective layer over the above mentioned thermal developing layer.

Abstract: A thermo-sensitive recording label paper comprising a laminate which comprises(1) a thermo-sensitive color-developing layer containing at least a colorless or lightly colored leuco-dye provided on one surface of a paper support, (2) a protective layer provided on the color-developing layer, and (3) at least one of a back layer and a protective underlayer, said back layer being provided on the other surface of the paper support, and said protective underlayer being provided between said paper support and said color-developing layer;the laminate having an internal bond strength of 2.5 kg-cm or more according to Tappi UM-403, and the surface of the protective layer of the laminate having a Bekk smoothness of 500 seconds or more according to JIS P8119.