Abstract: Reversible image-forming materials on which images are formed by a thermal head and conversely the formed images are erasable by water or moisture are obtained by providing, on one surface of a support, a recording layer comprising a specific fluorane type color former, a color developer and a binder and further providing an overcoat layer on the recording layer. By providing further a sticking prevention layer on the overcoat layer, sticking can be prevented and high speed printing is enabled.

Abstract: A heat-transfer recording sheet comprising a support and, coated thereon, a heat-meltable ink layer acquires the ability of reproducing the gradation when said ink layer contains a saturated linear polyester or gallic acid.

Abstract: A thermal transfer recording material comprising a thin substrate and a thermal transfer ink layer provided on the upper side of the substrate, wherein the thin substrate is a polyethylene film having a density of 0.935 or higher, causes no sticking phenomenon in thermal transfer recording.The above thermal transfer recording material, when the polyethylene film used therein further has a weight average molecular weight of 200,000 or higher, forms no frost image and causes no sticking of the polyethylene to the surface of a thermal head of a printer.

Abstract: In a heat-sensitive and heat-transferable recording sheet comprising a substrate, a heat-sensitive, color-forming layer provided on the front side of said substrate and a heat-transferable layer provided on the back side of said substrate, background fogging can be prevented by allowing the heat-transferable layer to be composed essentially of an electron-donating colorless dye, an electron-accepting compound, a low-melting substance and a desensitizer.

Abstract: The present invention relates to a biocapsule comprising a microorganism and useful substances captured by said microorganism and confined therein. This biocapsule has applications such as heat-sensitive recording papers and the like.

Abstract: A thermal transfer recording material comprising a combination of a donor sheet having a heat meltable ink layer on a support and an image receiving sheet which are superposed so that the heat meltable ink layer on the donor sheet contacts with the image receiving sheet, the thermal transfer being carried out by a thermal head, wherein either said donor sheet or said image receiving sheet or both sheets are characterized by being such that1. the heat meltable ink layer of the donor sheet principally comprises a colored dye or pigment, a binder and a wax which are coated on the support as an aqueous solution and/or an aqueous emulsion;2. the image receiving sheet has, coated thereon, a heat meltable substance having a melting point higher than that of said heat meltable ink layer.

Abstract: Reversible image-forming materials on which images are formed by a thermal head and conversely the formed images are erasable by water or moisture are obtained by providing, on one surface of a support, a recording layer comprising a specific fluorane type color former, a color developer and a binder and further providing an overcoat layer on the recording layer. By providing further a sticking prevention layer on the overcoat layer, sticking can be prevented and high speed printing is enabled.

Abstract: A thermosensitive recording paper consisting of a dye precursor and a color developer capable of coloring said dye precursor on heating, wherein one type of overcoat layer selected from the group consisting of alginates, alumina sol, colloidal silica and a mixture of alumina sol with colloidal silica is provided as the topmost layer thereof to give improved chemical resistance and good printing quality with a reduced deterioration in sensitivity and no residues and sticking.

Abstract: Disclosed is a process for thermal transfer impression, which comprises contacting a master image forming substrate sheet with a thermal transfer ink roll comprising as major components a wax, a coloring matter, and a low-melting-point resin, heating said substrate sheet on the side opposite to that in contact with the ink roll to impress a master image on the latter side of said substrate sheet, then bringing the impressed side of said substrate sheet in contact with an image receiving substrate sheet, and passing the resulting assembly through a heating device to transfer the impressed image to said image receiving substrate sheet. Multicolor thermal transfer impression is possible by using an ink roll divided into a plurality of ink sections of different colors.

Abstract: By using a multicolor heat transfer paper comprising a substrate and a mixture of at least two kinds of microcapsules coated on the substrate (each kind of microcapsules contain a different heat-sublimable dye and have a different film thickness), there can be obtained a clear multicolor transferred image only by the temperature control of the thermal head of a printer.

Abstract: A colorless, heat-sensitive and heat transfer recording sheet with pressure sensitivity comprising a base sheet, a heat-sensitive recording layer provided on one side of the base sheet and a heat transfer recording layer provided on the other side of the base sheet, the heat transfer recording layer being formed by coating on the base sheet a coating color comprising 3 to 20 parts by weight of microcapsules containing a colorless, electron-donating color former, 3 to 30 parts by weight of microcapsules containing a colorless, electron-accepting color developer, 3 to 30 parts by weight of a solid of a colorless, electron-donating, color former, 10 to 50 parts by weight of a solid of a colorless, electron-accepting, color developer and 25 to 200 parts by weight of a wax.

Abstract: A process for producing a multicolor heat transfer recording paper using hot-melt inks with different melting points is provided. With the recording paper obtained according to this process, it is possible to form high-density and clear multicolor transfer images by merely controlling the temperature of the thermal head in a thermal facsimile or other similar devices.

Abstract: A heat-sensitive recording sheet consisting of a support and a coating layer comprising microcapsules each containing therein at least a colorless dye precursor as color former, a color developer and a waxy substance being solid at the normal temperature and melting when heated, gives good image retention over a long period of time, has superior chemical resistance and causes no trailing or sticking to a thermal head when recording is made thereon with a heat-sensitive facsimile or a heat-sensitive printer.

Abstract: A heat-sensitive recording paper comprising a support having provided thereon a heat-sensitive layer comprising a dye precursor and a color developer at least one of which is dispersed in an organic solvent, e.g., cyclohexane, inert to these two components and microencapsulated is disclosed. The microcapsules are destroyed by applying pressure thereto after coating or before printing.

Abstract: A photosetting microcapsule containing a photosetting resin and a photopolymerization initiator can be controlled in rupture thereof. By utilizing such characteristics of said microcapsule and by using in combination said photosetting microcapsules containing a reactant such as an electron donative compound and the microcapsules containing a co-reactant such as an electron receptive compound capable of forming a colored material by reacting with said reactant or finely powdered co-reactant per se, there is provided a photo- and pressure-sensitive recording sheet which is capable of copying even a positive type original to provide a copy or copies with excellent keeping quality without causing any coloration or discoloration in the portion other than the characters, etc., of the original.

Abstract: A plain paper transfer type pressure-sensitive copying paper comprising a coated paper obtained by adding a surfactant to a coating color comprising a color-forming agent, a color-developing agent capable of reacting with said color-forming agent to yield a colored product and a wax; and coating the color to the surface of a support is free from the self color-formation of coated surface at the time of typing under pressure and is excellent in transferability and color-formability.

Abstract: A pressure-sensitive copying paper of "transfer to plain paper" type obtained by coating a mixture comprising (a) a colorless to light-colored electron-donating color former, (b) a colorless to light-colored electron-accepting color developer giving a colored product by reacting with said color former (a), (c) a wax and (d) a polyvinyl ether, on one side of a support and drying the coated support, provides an advantage which conventional copying papers of "transfer to plain paper" type do not possess, in that the density of a transfer image formed on a plain paper is higher than that of a reverse image formed on the coated side of a copying paper.

Abstract: A condensate free from stickiness and exhibiting an excellent initial color-formability when used as color developer of pressure sensitive copying paper can be obtained by reacting p-hydroxybenzoic acid and one p-alkyl-substituted phenol or a mixture of two or more p-alkyl-substituted phenols with formaldehyde in the presence of an acid catalyst and then directly taking out the condensate into cold water without any procedure such as dehydration, concentration, etc.

Abstract: Pressure-sensitive copying paper prepared by coating a substrate with a single layer containing a color forming reaction system comprising a metal compound and ligand and further containing a wax can reproduce a clear and fast image onto plain paper.

Abstract: A thermosensitive recording paper consisting of a dye precursor and a color developer capable of coloring said dye precursor on heating, wherein one type of overcoat layer selected from the group consisting of alginates, alumina sol, colloidal silica and a mixture of alumina sol with colloidal silica is provided as the topmost layer thereof to give improved chemical resistance and good printing quality with a reduced deterioration in sensitivity and no residues and sticking.