Abstract: A heat-sensitive recording sheet obtained by applying aqueous dispersions of an electron donating colorless dye and an electron accepting compound to a base is disclosed. This heat-sensitive recording sheet is characterized in that at least one of the aqueous dispersion of the electron donating colorless dye and the aqueous dispersion of the electron accepting compound is dispersion prepared by dispersing by means of a horizontal sand mill.

Abstract: A heat-sensitive recording sheet comprised of a support base having a heat-sensitive color forming layer thereon is disclosed. The layer is comprised of an electron donating dye, an electron accepting compound which reacts with the dye to form a color and a surface active agent. The surface active agent has a structure of ##STR1## as a hydrophobic atomic group, wherein R.sub.1 and R.sub.2 independently represent an alkyl group having 3 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, or a cycloalkyl group having 5 to 10 carbon atoms. The heat-sensitive recording sheet has high sensitivity, produces high density color images and results a reduced amount of background fog.

Abstract: A heat-sensitive recording paper having a heat-sensitive color-forming layer on the glossy surface of a support base comprised of raw paper manufactured with a Yankee machine is disclosed. The paper has improved surface smoothness and back side roughness because the raw paper used was manufactured with the Yankee machine. The heat-sensitive recording paper produces an image with increased density without increased fogging.

Abstract: A heat-sensitive recording material comprising a heat-sensitive color forming layer on a base is disclosed. The color forming layer contains an electron donating colorless dye and an organic acid to which a heat-fusible substance having a melting point in the range of from 60.degree. to 150.degree. C. is fusion-bonded. A process for producing such recording material by applying to a base a coating solution containing a developer for heat-sensitive recording is also disclosed. The developer is prepared by the steps of dispersing in a dispersion medium a heat-fusible substance having a melting point in the range of from 60.degree. C. to 150.degree. C. and an organic acid, heating the resulting dispersion under conditions that form a turbulent flow, and cooling the heated dispersion to ordinary temperatures.

Abstract: A heat-sensitive recording paper comprising a paper support having coated thereon a heat-sensitive recording layer, which is surface-treated by passing said recording paper, after drying said heat-sensitive recording layer, through a pressure-applying member comprising a combination of a metal roll and an elastic roll of from 70 to 90 in Shore hardness wherein said heat-sensitive layer surface is contacted with said metal roll.

Abstract: An ink-jet recording method is described for producing a recorded image on an image-receiving sheet with a jet of aqueous ink, wherein an ink jet is projected onto an image-receiving sheet comprising a surface layer containing a pigment, and said surface layer is capable of adsorbing a coloring component in said aqueous ink.

Abstract: A heat-sensitive recording paper which has on a paper support a heat-sensitive recording layer having received a surface treatment in such a state that the recording paper comes to contain moisture in a proportion ranging from 5 wt % to 12 wt % by drying after the coating of the heat-sensitive recording layer. The surface treatment is effected by passing the recording paper through a pressure applying means. The pressure applying means is constructed by metal roller heated up to a temperature of 40.degree. C. to 60.degree. C. and an elastic roller (made preferably of hard rubber). The recording layer is brought into a face-to-face contact with the metal roller.

Abstract: A heat-sensitive recording paper is disclosed having improved heat-transmission efficiency between a recording element and the heat-sensitive recording paper. The disclosed heat-sensitive recording paper includes a support base paper having an aqueous-sensitive developable layer coated thereon. In the base paper used, the value obtained by dividing Stockigt sizing degree by a square number of meter areal weight is 3.times.10.sup.-3 (S.m.sup.4 /g.sup.2) or more and Bekk smoothness of 90 seconds or more. The aqueous heat-sensitive developable layer coated on the surface of the base support includes a dispersion of particles having a volume average particle size of 8 .mu.m or less, said layer being coated on the surface of the base support to a thickness of 5 to 10 .mu.m.

Abstract: A heat-sensitive recording material comprising a heat-sensitive color forming layer on a base is disclosed. The color forming layer contains an electron donating colorless dye and an organic acid to which a heat-fusible substance having a melting point in the range of from 60.degree. to 150.degree. C. is fusion-bonded. A process for producing such recording material by applying to a base a coating solution containing a developer for heat-sensitive recording is also disclosed. The developer is prepared by the steps of dispersing in a dispersion medium a heat-fusible substance having a melting point in the range of from 60.degree. C. to 150.degree. C. and an organic acid, heating the resulting dispersion under conditions that form a turbulent flow, and cooling the heated dispersion to ordinary temperatures.

Abstract: An ink-jet recording method is described comprising applying an ink-jet onto a synthetic pulp paper and then heat-treating the synthetic pulp paper to fuse synthetic pulp, to obtain an ink-jet recording having high density, water resistance, and color-reproduction properties.