Abstract: An ink jet recording material having an ink-absorbing layer containing a gelatin crosslinked with at least one compound selected from the group consisting of compounds of the following general formulas: ##STR1## wherein X is a bivalent residue having a carbonyl or sulfonyl group bonded to an N atom, R.sup.1, R.sup.2, R.sup.4 and R.sup.5 are monovalent residues, R.sup.3 and R.sup.6 are bivalent residues, p and q are integers of 0 or 1, Ar.sup.+ is a heteroaromatic group having a quaternary nitrogen atom, n is an integer of 1 to 3, and y.sup.n- is an n-valent anion.

Abstract: A thermosensitive recording material which contains an aromatic isocyanate compound, an imino compound having at least one >C.dbd.

Abstract: The present invention provides a heat-sensitive recording material excellent in image stability and heat-responsiveness which contains an aromatic isocyanate compound, an imino compound and at least one compound represented by the following formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents an alkyl group.

Abstract: A heat-sensitive recording material comprising a support and a heat-sensitive recording layer provided on the support, said heat-sensitive recording layer comprising an aromatic or heterocyclic isocyanate compound, an imino compound, a binder, a specific alcoholic compound, and preferably, a specific biphenyl derivative. The heat-sensitive recording material have an excellent image preservability and heat responsiveness.

Abstract: A heat-sensitive recording material comprising a support and a heat-sensitive recording layer provided on the support, said heat-sensitive recording layer comprising an aromatic or heterocyclic isocyanate compound and an imino compound which reacts with the isocyanate compound to form color upon heating, said isocyanate compound being in the form of particles having an average diameter of 0.7-3.0 .mu.m. With use of the heat-sensitive recording material, images sufficient in optical density for practical use can be printed.

Abstract: Disclosed is a heat-sensitive recording material comprising an aromatic isocyanate compound, an imino compound which reacts with said aromatic isocyanate compound upon application of heat to form color, and a support, wherein a coating color comprising a dispersion obtained by pulverizing a mixture of said aromatic isocyanate compound and an alcoholic compound has been coated on the support. This heat-sensitive recording material is excellent in image stability and sensitivity.

Abstract: A color image recording material which can afford full color images superior in resolution and shelf stability is provided by forming a whitening layer having a specific property and an image receiving layer and, if necessary, a transparent film layer in succession on a photosensitive layer.

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 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 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.