Abstract: A thermosensitive recording material comprises a thermosensitive recording layer comprising a binder resin, and a leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of heat thereto, and a protective layer on the said thermosensitive recording layer in which layer a spherical filler and irregular shape filler is employed.

Abstract: A thermosensitive recording material is provided which includes a substrate, a thermosensitive recording layer formed on the substrate and including a binder resin, a coloring agent and a coloring developer inducing color formation in the coloring agent upon application of heat thereto, and a protective layer formed on the thermosensitive recording layer and including a resin, wherein the protective layer includes a particulate organic filler (A) whose average particle diameter is from about 1.2 to about 3.0 times the thickness of the protective layer and a particulate organic filler (B) having an average particle diameter of from about 0.05 to about 0.7 .mu.m. The thermosensitive recording material has good image qualities without undesired white streaks and good ability to be used with thermal printheads without sticking to and wearing out the thermal printheads.

Abstract: A thermosensitive recording material having high transmittance density, excellent reproducibility of fine dot images and half tone images under printing conditions ranging from low to high applied printing energy.The thermosensitive recording material, including a substrate and a thermosensitive coloring layer, formed on the substrate, the thermosensitive coloring layer including a leuco dye, a coloring developer for inducing color formation in the leuco dye upon application of heat thereto and binder resins, and an optional protective layer, formed on the thermosensitive coloring layer, wherein the binder resins include at least two resins having different glass transition temperature Tg and are present in total amount of more than about 0.25 parts by weight per 1 part of total weight of the thermosensitive coloring layer.

Abstract: A thermosensitive recording material having a support and a thermosensitive coloring layer formed on the support, capable of inducing color development by the application of heat thereto is disclosed, the stiffness of the thermosensitive recording material in the lengthwise direction thereof in accordance with JIS-P-8125 being less than 0.45 exp.sup.0.018x (gf.multidot.cm) wherein x represents the thickness (.mu.m) of the recording material measured in accordance with JIS-P-8118, provided that the lengthwise direction of the recording material is (i) a machine direction in which cellulose fiber contained in a natural material for use in the support is oriented, or (ii) a plane direction of the recording material when a synthetic material is used for the support.

Abstract: A brightening chemical polishing solution for a hardened steel article (e.g., a carburized and quenched gear) comprises hydrofluoric acid having a molar concentration of from 0.2 to 2 mol/l, hydrogen peroxide having a molar concentration of from 0.4 to 4 mol/l, and water, a molar ratio of the hydrofluoric acid to the hydrogen peroxide being from 1:1.5 to 1:2.8. The steel article is quench hardened and is chemically polished in the solution. A shot-peening is additionally performed, prior to the polishing.

Abstract: A brightening chemical polishing solution for a hardened steel article (e.g., a carburized and quenched gear) comprises hydrofluoric acid having a molar concentration of from 0.2 to 2 mol/l, hydrogen peroxide having a molar concentration of from 0.4 to 4 mol/l, and water, a molar ratio of the hydrofluoric acid to the hydrogen peroxide being from 1:1.5 to 1:2.8. The steel article is quench hardened and is chemically polished in the solution. A shot-peening is additionally performed, prior to the polishing.

Abstract: A thermosensitive recording material is composed of a support, a thermosensitive coloring layer capable of inducing color formation upon application of heat thereto, formed on the support, and an overcoat layer formed on the thermosensitive coloring layer, the overcoat layer being essentially composed of a resin component which is crosslinked by a glycidylamine compound serving as a crosslinking agent for the resin component. A coating liquid for the formation of the overcoat layer is essentially composed of the resin component and the glycidylamine compound.

Abstract: A thermosensitive recording material is composed of a support, a thermosensitive coloring layer capable of inducing color formation upon application of heat thereto, formed on the support, and a protective layer including a resin and a filler formed on the thermosensitive coloring layer, the filler containing aluminum hydroxide or/and aluminum oxide particles, having a volume mean diameter of 1 .mu.m or less, with the amount of the particles with a diameter of 4 .mu.m or less being 90 vol. % or more in the entire particles.

Abstract: A thermosensitive recording material which comprises a support, an intermediate layer including a foamed portion with minute voids, having a smoothness of 2,000 seconds or more in terms of Bekk's smoothness, and a thermosensitive coloring layer, successively formed on the support, and which layers show the compression strain of 20% or more when a pressure of 0.55 kg/cm.sup.2 is applied in accordance with the Japanese Industrial Standards (JIS) P-8118. This thermosensitive recording material shows the compression strain of 5% or more as a whole when a pressure of 0.55 kg/cm.sup.2 is applied in accordance with the JIS P-8118.

Abstract: A thermosensitive recording material which comprises a support, an intermediate layer including a foamed portion with minute voids, having a smoothness of 2,000 seconds or more in terms of Bekk's smoothness, and a thermosensitive coloring layer, successively formed on the support, and which layers show the compression strain of 20% or more when a pressure of 0.55 kg/cm.sup.2 is applied in accordance with the Japanese Industrial Standards (JIS) P-8118. This thermosensitive recording material shows the compression strain of 5% or more as a whole when a pressure of 0.55 kg/cm.sup.2 is applied in accordance with the JIS P-8118.

Abstract: A thermosensitive recording material is disclosed, which comprises a support, and a thermosensitive recording layer formed on one side of the support, the thermosensitive recording layer comprising (i) a thermosensitive coloring layer comprising a thermosensitive coloring system capable of producing a color upon application of heat thereto, and (ii) a colored layer comprising a colored fluorescent dye composition.