Abstract: A method and substrate for printing information wherein at least one coating is applied to a substrate, the coating having a colorformer leucodye and at least one color activator. The colorformer leucodye and at least one activator react when heated to exhibit a chromic change of at least one of a color change visible in normal light and a fluorescence visible only in ultraviolet light. The at least one coating is heated with at least one laser beam to effect the chromic change at selected points to thereby print information.

Abstract: A rewritable thermal recording medium of this invention uses a recording material which reversibly changes between an equilibrium state and a quasi-equilibrium state different in color condition from the equilibrium state when a predetermined heat treatment is performed. This rewritable thermal recording medium includes a substrate and a recording layer formed on the substrate. The recording layer has a first region containing a first recording material which takes on lighter color in quasi-equilibrium than in equilibrium, and a second region containing a second recording material which takes on darker color in quasi-equilibrium than in equilibrium.

Abstract: A reversible heat-sensitive recording medium has a substrate where a reversible heat-sensitive recording layer and a protective layer are successively formed on top of it. The reversible heat-sensitive recording layer is formed by a reversible heat-sensitive recording material including a leuco dye and a color developing/reducing agent. The color developing/reducing agent is a combination of two kinds of color developing/reducing agents, one with a high color developing ability and the other with high image preservation and stabilization capabilities. The two agents are combined at a ratio between 1:4 to 4:1. Thus a reversible heat-sensitive recording material with a fine color developing ability and high image preservation and stabilization capabilities can be obtained.

Abstract: A thermally imagable business record such as a form, tag, label or the like is provided in which selected areas of the record may be activated to form an image upon exposure to heat. In one embodiment, at least one selected area of a substrate surface contains a thermally imagable coating of initially colorless color formers and color developers while the remaining areas of the substrate are left uncoated. The substrate may be pre-coated to provide a smooth, non-porous base coat for the thermally imagable coating, and may also include a protective coating layer to protect the subsequently printed thermal image.

Abstract: A multi-color heat-sensitive recording material including a support and two or more heat-sensitive recording layers formed on the support, wherein the support is a sheet-like substrate formed such that a resin layer is formed at least on the side of a base paper where the heat-sensitive recording layers are formed, and the surface of the sheet-like substrate on the side where the heat-sensitive recording layers are formed has a three-dimensional surface roughness of not more than 0.3 .mu.m as measured at a filter wavelength of 0.8 to 2.5 mm before thermal recording is performed. The three-dimensional surface roughness of the sheet-like substrate is not more than 0.4 .mu.m as measured at a filter wavelength of 0.8 to 2.5 mm after thermal recording is performed. The support is constructed of a sheet-like substrate having a resin layer on each of base paper. The rigidity of the sheet-like substrate as defined by JIS P8125 is 1.5 to 8.0 gf.multidot.cm, preferably 3.0 to 6.0 gf.multidot.

Abstract: A security document is provided containing a color-forming composition having an insulating material therein which allows the document to be passed through heated printing devices such as laser printers without the problem of premature color development. The color-forming composition includes a mixture of a color former, a color developer, and an insulating material. In a preferred embodiment, a toner adhesion-enhancing composition containing an insulating material is applied over the color-forming composition. The security document may be used to provide an authentication feature and/or an indication of attempted alterations from the use of solvents, heat or abrasion.

Abstract: A heat-sensitive document capable of providing multiple colors comprising a support having at least one surface bearing a first coating comprising a substantially colorless, chromogenic composition which is capable of producing a first color, a second coating covering a portion of the first coating, the second coating being an opaque coating, comprising an opacifying agent and a hydrophobic, polymeric binding agent, and a localized third coating covering at least a portion of said second coating comprising a substantially colorless, heat-activatable chromogenic composition capable of producing a second color, preferably under the application of heat. The opaque coating is "dual-functional", since it both enhances multicolor image quality and acts as a primer for adhering the localized chromogenic coating composition.

Abstract: The present invention provides a heat sensitive multiple color recording material which produces different color tone by changing applied thermal energy and which has stable developed color image and little color mixture. The heat sensitive color recording material comprises: (a) a substrate, (b) a sublimable dye coloring layer, formed on the substrate (a), and (c) at least one leuco dye color-developing layer, formed on the sublimable dye coloring layer (b), wherein the sublimable dye coloring layer (b) is composed of a sublimable dye layer and a thermoplastic resin layer for fixing the sublimable dye. The leuco dye color-developing layer (c) contains a leuco dye and a developing agent for the leuco dye, and also contains, either within the leuco dye color-developing layer (c) or as an adjacent layer, microcapsules containing a color eraser for erasing the developed color.

Abstract: A thermal paper with an image derived from a water-based security ink has more than one means of security. A variable light absorbing and/or transmitting pigment or dye in the ink is a first security and a water repelling agent in the ink is a second security. A pseudo-watermark from the coloration of the ink under ambient conditions is a third security. Visible images can be generated from the printed ink upon exposure to UV or infrared light. Methods of preparing the thermal paper comprise printing the security ink on thermal paper with only one thermosensitive coating on the surface opposite the thermosensitive coating.

Abstract: A heat sensitive recording material is provided which can be simply prevented from falsification and is excellent in contrast between fixed portion and image portion, and a recording method using it is further provided. Moreover, there is provided a heat sensitive recording material capable of carrying out multicolor recording which is excellent in contrast of the image portions, density of the image portions, and image storage stability.

Abstract: This invention relates to a thermal dye transfer assemblage comprising:I) a dye-donor element comprising a support having thereon a set of sequential repeating dye patches of two subtractive primary color image dyes dispersed in a polymeric binder; andII) a dye-receiving element comprising a support having thereon in order:a) a layer comprising a heat-sensitive, dye-forming precursor of a third, complementary, subtractive primary color image dye dispersed in a polymeric binder, the dye-forming precursor being capable of forming the third, complementary, subtractive primary color image dye at a temperature which is higher than the temperature used to transfer the other two subtractive primary color image dyes; andb) a dye image-receiving layer; the dye-receiving element being in superposed relationship with the dye-donor element so that the dye layer is in contact with the dye image-receiving layer.

Abstract: A footwear has a thermochromic coloring color-memory layer having a large hysteresis on a color-density-to-temperature curve so as to show interchangeability between a first color phase and a second color phase different from the first color phase, and a coloring tool for forming a desired image on the footwear.

Abstract: A reversible thermal recording medium comprises a composition containing a color former, a developer, a reversible material capable of reversibly changing the state of the composition by supplying heat energies with two different values, and, as required, a phase separation controller which permits changing the phase separation speed of the developer at temperatures in the vicinity of the melting point of the phase separation controller, at least 80% by weight of the reversible material being a sterol compound in which the carbon-to-carbon bond between 2- and 3-positions of the stroid skeleton is a single bond, the carbon-to-carbon bond between 3- and 4-positions of the steroid skeleton is a single bond, a hydroxyl group is attached to the carbon atom in at least the 3-position of the steroid skeleton, and a specified chemical structure is bonded at 16- and 17-positions of the stroid skeleton, and the phase separation controller being provided by a low molecular organic material, the maximum carbon chain leng

Abstract: A linerless continuous series of pressure sensitive adhesive labels is provided which have on one or more selected portions thereof a series of imagable coatings which may be activated to form colored images or areas. The series of labels include a web having first and second surfaces, with a series of imagable coatings of color formers and color developers on the first surface of the web. A coating of a release material overlies the imagable coatings on the first surface of the substrate, and a coating of a pressure sensitive adhesive is positioned on the second surface of the web. The series of labels are wound or stacked so that the coating of pressure sensitive adhesive contacts the release material to permit individual labels to be dispensed.

Abstract: There is provided a developer composition including at least one of sulfonyl compounds represented by formula (1) and at least one of sulfonyl compounds represented by formula 2: ##STR1## wherein X is H or lower alkyl, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 which may be the same or different, present H, halogen or lower alkyl and Y represents alkyl, benzenesulfonyl, benzoyl et al, A thermalsensitive recording medium having the above developer is of high sensitivity, less surface-blushing with lapse of time and is excellent in storage stability of a recorded image, particularly in heat resistance, humidity resistance and anti-plasticizer.

Abstract: A thermosensitive recording material with a high resistance to fogging has a thermosensitive colored image-forming layer formed on a support and includes at least one colorless dye precursor, a color-developing agent and a binder, the dye precursor being contained in a plurality of fine solid composite particles prepared by dissolving a solute including the dye precursor in a solvent which includes a polymerization component including a polyvalent isocyanate compound; emulsifying the resultant solution in an aqueous medium; and subjecting the aqueous emulsion to a polymerization reaction to thereby form the fine solid composite particles in which the dye precursor is solid-dissolved in a solid thermoplastic resin matrix formed from a resultant polyurea or polyurethane polyurea resin.

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 light- and heat-sensitive recording material is disclosed, comprising a support provided thereon a light- and heat-sensitive layer containing a photo-color-forming element comprising a photodecomposable compound and an element capable of forming a color upon reaction with a decomposition product of the photodecomposable compound, wherein the photo-color-forming element is imagewise heated so as to be mixed to thereby form a latent image and the latent image is further exposed to light to form a color; at least one of the photodecomposable compound and the element capable of forming a color upon reaction with the decomposition product of the photodecomposable compound being dispersed through solution in an organic solvent.

Abstract: A heat-sensitive image recording material contains on a support material1. at least one binder layer with a heat-sensitive imaging combination of an organic silver salt and an organic reducing agent for the organic silver salt, and2. at least one binder layer or a sequence of binder layers with a heat-sensitive imaging combination of an acid-sensitive leuco dye and an acidically reacting compound which acts as a developer for the leuco dye,wherein the leuco dye and developer are in thermal interaction with each other either in different layers or separately from each other in the same layer, characterised in that a layer with a water- or alcohol-soluble polymer is arranged between the combination of organic silver salt and organic reducing agent for the organic silver salt, on the one hand, and the combination of leuco dye and acidically reacting compound, on the other.

Abstract: There is described a novel thermographic recording film, and more specifically, a novel image-forming system incorporated therein which employs both thiolactone and silver reduction chemistries.Thermographic recording films comprising the novel image-forming system of the present invention exhibit excellent thermal sensitivity and visual color saturation, enhanced image density, and desirable visual minimum optical densities.

Abstract: There is described a novel thermographic recording film, and more specifically, a novel image-forming system incorporated therein comprising at least one layer and including and a Lewis acid material, a di- or triarylmethane thiolactone dye precursor, an acidic organic material, a binder and a thermal stabilizer.Thermographic recording films comprising the novel image-forming system of the present invention exhibit excellent thermal stability, and desirable minimum optical densities, indicative of substantially less premature image development at elevated environmental temperatures.Embodiments of the invention wherein the thermographic recording films further include a light insensitive organic silver salt, a reducing agent, a binder and, preferably, a toning agent, show substantially enhanced image density.

Abstract: A latent image printing method and apparatus uses a substrate with one main surface having a covering comprising only one of a first pair of a color developer and color former dye in at least one selected latent imaging area defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color and a continuous coating over the covering which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair. The coating above selected portions of the covering corresponding to a desired latent image is removed.

Abstract: A heat transfer sheet comprising a polyester film substrate sheet, an adhesive layer formed on one surface of the substrate sheet by applying the adhesive layer to the substrate sheet and biaxially stretching both the layer and the sheet simultaneously, and at least two heat transfer layers formed on said adhesive layer, a first layer comprising a thermally migratable dye and an untransferable binder, and second layer comprising a dyed or pigmented, heat-meltable binder.

Abstract: To provide a reversible multi-color thermal recording medium or a reversible multi-color optical recording medium which uses novel urea and thiourea derivatives and has excellent heat resistance.A reversible multi-color thermal recording medium having an irreversible thermal composition containing a colorless or pale basic achromatic dye and an organic color developer as main components and a reversible thermal composition containing a colorless or pale basic achromatic dye and an organic color developer as main components laminated on a support, the organic color developer contained in the irreversible thermal composition being an irreversible heat-resistant color developer and the organic color developer contained in the reversible thermal composition being a reversible heat-resistant color developer.

Abstract: The present invention provides novel indolylazaphthalides represented by formula (I) described below. The indolylazaphthalides are useful as electron donative colorless dyes for preparing recording materials. Recording materials containing the novel indolylazaphthalides of formula (I) as electron donative colorless dyes provide images having blue to cyan colors at an excellent density, while suppressing light coloration in non-image areas. ##STR1## wherein R.sup.1 represents a divalent linkage group such as an alkylene group, cycloalkylene group, aralkylene group, or a phenylene group, which linkage group is linked to a bimolecular indolylazaphthalide compound to form a bis-type structure.

Abstract: A piggyback label construction includes a first label having a stock ply with a bottom face having pressure sensitive adhesive, and an imagable top face. A second label comprises a stock ply having a bottom face with pressure sensitive adhesive, a top face with a continuous image-producing coating, and a continuous adhesive release coating over the image-producing coating. The image-producing coating preferably is a thermosensitive coating having a first heat activation temperature of about 140.degree.-250.degree. F. (preferably about 145.degree.-155.degree. F). The first label stock ply has a weight of about 30 lbs. per 1000 sheet 11".times.17" ream, or less (preferably about 18-30 lbs.). The first label stock imagable top face preferably is a second thermosensitive coating having a higher heat activation temperature than the first heat activation temperature. The image-producing coating may comprise a self-contained coating.

Abstract: A reversible thermal recording medium having a core material capable of being change in state by heat and a recording layer including capsules containing this core material. A repeatability corresponding to the limit of possible repeated recording/erasing effected by a physical or chemical change in the material constituting the recording can be obtained. A deterioration in image quality caused by transfer of a part of the recording layer to the heating unit can be prevented and repeat characteristics can be improved, thereby limiting the running cost.

Abstract: A recording paper including a color varying layer which normally exhibits a predetermined color and a substrate layer having a color different from that of the color varying layer, wherein the predetermined color disappears when a beam of specific wavelength is incident thereon.

Abstract: A document capable of providing multiple colors under the application of heat comprising a support having at least one surface bearing a first coating comprising a substantially colorless, heat activatable chromogenic composition capable of producing a first color under the application of heat, and a second coating comprising a localized coating of a substantially colorless, heat activatable chromogenic composition capable of producing a second color under the application of heat. Each chromogenic composition comprises a chromogenic compound and a color developer that are substantially colorless solids in physical contact prior to reaction, but which can chemically react to produce a visible colored image by application of heat at temperatures above room temperature. Under the application of heat from a thermal printer, by quickly striking the chromogenic composition with a fingernail or blunt object to produce frictional heat, or other heat application, multicolored images are provided.

Abstract: A recording material comprising a plastic film provided with a layer of ionizing radiation cured resin having a hardness equal to or harder than a pencil hardness of H and an image-forming layer having pressure sensitivity or thermal sensitivity or photosensitivity and thermal sensitivity, wherein rippling during storage in high humidity or caused by heat is markedly reduced.

Abstract: A data storing medium comprising a substrate, a first display portion, provided on the substrate, for displaying predetermined data, the first display portion having a first recording material storing data by first recording energy and erasing stored data of history of the use by predetermined erasing energy, and a second display portion, provided on the substrate, for displaying the same data as displayed by the first display portion, the second display portion having a second recording material for storing the data by a second recording energy different from the first recording energy, and stored data being impossible to be erased.

Abstract: A pressure and heat-sensitive composition comprising chromogen-containing pressure-rupturable microcapsules and heat-sensitive color developer useful for verification of document authenticity system when applied as a localized coating on documents, such as checks and prescriptions. Quickly striking the chromogenic composition with a fingernail or blunt object to generate pressure and heat in the coating produces a colored image by friction. The chromogenic composition possesses a fugitive characteristic, whereby the colored image gradually disappears and can be made to reappear when the chromogenic coating is again subjected to external pressure and heat. This feature can be used for repeated verification of the authenticity of the document.

Abstract: A reversible thermosensitive coloring recording method for producing multi-color images by use of a reversible thermosensitive coloring recording medium which is composed of a support and a reversible thermosensitive coloring recording layer containing a plurality of reversible thermosensitive coloring compositions, each coloring composition being independently present separated from the other coloring compositions, and capable of reversibly forming a color development state with a different color in a predetermined color development temperature range, and a decolorization state in a predetermined decolorization temperature range by the application of heat thereto and maintaining the above two states at room temperature, the decolorization temperature range being located lower in terms of temperature than the color development temperature range therefor, comprises the steps of: temporarily applying heat to the recording medium to a color development temperature at which at least two of the coloring compositio

Abstract: A linerless label and method of production thereof are provided which result in a fully utilizable thermal transfer linerless label. A substrate of label material has first and second faces each having first and second substantially parallel first and second edges, and a coating of thermal transfer material substantially completely covers the first face. First and second adhesive release material patterns, such as strips of UV curable silicone, are disposed substantially along the first and second edges of the first face, and first and second adhesive patterns, such as strips of a permanent hot melt adhesive, are disposed substantially along the first and second edges of the second face in alignment with the silicone strips, the patterns covering less than fifty percent of the label faces. The width of the adhesive strips are less than the silicone strips.

Abstract: In accordance with the present invention there is provided a system and method for featuring information on a record. The system and method utilize reactant and coreactant compositions which are formulated to produce a color-changing reaction when brought together. The system and method also utilize a record having first and second areas disposed adjacent to each other. The second area is generally treated with the reactant composition. The coreactant composition is formulated to exhibit a first marking color on the first area of the record and to produce a color-changing reaction with the reactant composition on the second area of the record. The color-changing reaction effects a second marking color on the second area. The system and method further utilize a writing implement containing the coreactant composition. The implement is used to deposit the coreactant composition on the first and second areas in the form of symbolic information.

Abstract: This invention provides a pressure- and heat-sensitive multilayer copying paper useful as a recording material for various types of recording machines, such as a portable terminal. A pressure- and heat-sensitive multilayer copying paper comprises: an upper paper member composed of: a substrate sheet; a layer provided on a front surface of the substrate sheet comprising a organic compound and an acidic organic compound; a layer provided on a back surface of the substrate sheet comprising a organic compound, microcapsules encapsulating the organic compound and a thermomeltable material; and an overcoated protective layer placed on the layer provided on a back surface of the substrate sheet; and a lower paper member: a substrate sheet; a layer provided on a front surface of the substrate sheet comprising at least one acidic organic compound which forms color in case that it reacts with the organic compound.

Abstract: A thermochromic color-memory compositions exhibiting high color contrast between high color density in a colored state and sufficiently low color density in a decolored state with high freedom of selection of the reaction medium, and highly useful as a thermochromic material. The thermochromic color-memory composition comprises a homogeneous solubilized mixture of essential three components of (a) an electron-donating color-developing organic compound, (b) an electron-accepting compound, and (c) a reaction medium for controlling a color reaction of the component (a) with the component (b); the component (c) being selected from aliphatic ketones of 10 to 22 total carbons and aryl alkyl ketones of 12 to 24 total carbons; and the composition changing the color thereof with a large hysteresis width (.DELTA.H) of from 8.degree. C. to 80.degree. C.

Abstract: A reversible thermosensitive coloring recording method for producing multi-color images by use of a reversible thermosensitive coloring recording medium which is composed of a support and a reversible thermosensitive coloring recording layer containing a plurality of reversible thermosensitive coloring compositions, each coloring composition being independently present separated from the other coloring compositions, and capable of reversibly forming a color development state with a different color in a predetermined color development temperature range, and a decolorization state in a predetermined decolorization temperature range by the application of heat thereto and maintaining the above two states at room temperature, the decolorization temperature range being located lower in terms of temperature than the color development temperature range therefor, comprises the steps of: temporarily applying heat to the recording medium to a color development temperature at which at least two of the coloring compositio

Abstract: A color recording method and device which is capable of color recording images on large-sized paper in which a first color is developed in direct heat sensitive paper by directly supplying heat energy of thermal heads to the direct heat sensitive paper. Furthermore, in order to transfer a color ink to the direct heat sensitive paper to thereby obtain a second color, the heat energy of the thermal heads is supplied to a plurality of ink ribbons which are coated with both a desensitizing material for controlling the coloring reaction of the direct heat sensitive paper and the desired colored inks.

Abstract: A non-photosensitive heat-sensitive recording material suited for use in direct thermal imaging by means of information-wise energized heating elements, wherein said recording material comprises:(i) at least two imaging layers each containing uniformly distributed in a film-forming resin binder (1) a metal salt in thermal working relationship with (2) an organic reducing agent, and(ii) at least one heat-attenuating spacer layer for separating said imaging layers from each other.

Abstract: A thermal transfer printing medium is provided which includes a foundation, and a transfer layer provided on one side of the foundation and comprising a heat-meltable color ink layer, a heat-meltable transparent ink layer, a metal deposition layer and an adhesive layer which are stacked in that order from the foundation side. The thermal transfer printing medium is capable of forming print images in a color inherent to the color ink layer, free from the influences of the color of the image-receiving medium and the metal deposition layer serving as a hiding layer.

Abstract: A business record such as a form, tag, label or the like is provided in which different selected colored areas may be activated in a single pass through a printer. In one embodiment, coatings of initially colorless color formers and color developers are coated on selected areas of a substrate surface. The color formers and color developers combine upon exposure to an imaging force, such as heat or pressure, to form different colored visible areas on the sheet. In an alternative embodiment, the coatings of color formers and color developers are self-contained coatings having pressure-rupturable microcapsules containing either the color formers or said color developers.

Abstract: A reversible heat-sensitive recording medium comprising a reversible heat-sensitive recording layer containing a resin matrix and an organic low molecular weight material, and an overcoat layer, wherein an intermediate layer comprising an ultraviolet ray-crosslinkable or electron beam-crosslinkable resin as a main component is provided between the reversible heat-sensitive recording layer and the overcoat layer.

Abstract: A business form such as a label, tag or the like is provided in which a thermally imagable substrate has on selected portions of its surface a plurality of different colored areas. At least one of the colored areas is obscured by thermally imaging the substrate in a selected area so as to provide color coded information. The colored areas may be preprinted as half-tone screened areas on the substrate in a number of different patterns and arrangements. The form may be printed with both color coded information and variable information in a single printing pass.

Abstract: There is discloses a magnetic recording sheet comprising a substrate, a magnetic recording layer formed on one side of the substrate, an image recording layer formed on the other side of the substrate, a first subbing layer formed between the substrate at the magnetic recording layer, and preferably, a second subbing layer formed between the substrate and the image recording layer, said magnetic recording layer comprising a magnetic powder and an aqueous binder, said image recording layer comprising a binder, and said first and second subbing layers comprising a styrene-butadiene latex having a gel content of 5 to 75%. This magnetic recording sheet can be obtained without any trouble in its production process and is excellent in dimensional stability, magnetic recording properties, image-recording properties, etc.

Abstract: In a thermal recording sheet including an intermediate layer, and a thermal color developing layer containing a leuco dye type chromogenic component containing a leuco dye and an organic color developer as main ingredients and a metal chelate type chromogenic component containing an electron acceptor and an electron donor as main ingredients, stacked on a substrate, the intermediate layer contains a pigment having an oil absorption of 100 ml/100 g or less measured according to JIS K 5101, and the thermal color developing layer contains at least one of compounds of Formula (I) and Formula (II) as an organic color developer, a metal double salt of higher fatty acid having 16 to 35 carbon atoms as an electron acceptor, and a polyhydric hydroxy aromatic compound of Formula (III) as an electron donor, whereby providing a thermal recording sheet which is superior in dynamic sensitivity, background color, image stability such as oil resistance and plasticizer resistance, and print adaptability: ##STR1## wherein R is

Abstract: A multi-color heat-sensitive recording material which comprises a support having thereon at least two heat-sensitive recording layers, each of which comprises a colorless or pale-color color forming agent which forms a color by heating, a color developer and a binder, an intermediate layer being incorporated between the two heat-sensitive recording layers and the intermediate layer comprising at least gelatin and/or a gelatin derivative and polyvinyl pyrrolidone and/or a polyvinyl pyrrolidone derivative, with the polyvinylpyrrolidone and/or the polyvinylpyrrolidone derivative having an average molecular weight of not more than 160,000, the content of which ranges from 1 to 20 percent by weight based on the weight of the gelatin and/or gelatin derivative.

Abstract: The invention provides a recording material inhibited from alteration which comprises a substrate, an undercoat layer containing a white or light colored inorganic fluorescent pigment having an emission maximum wavelength of 400-700 nm and provided on one side of the substrate, and a recording layer provided on said undercoat layer. The recording layer may be a heat-sensitive layer or a pressure-sensitive layer. A magnetic recording layer comprising ferromagnetic powders may be provided on another side of the substrate.

Abstract: A double-surface heat-sensitive record material is disclosed that provides separable, thermally printed surfaces. The invention includes a first heat-sensitive record surface having an exposed heat-sensitive record layer on one surface, a pressure-sensitive adhesive layer, and release liner on an opposed surface. A second heat-sensitive record surface includes a second heat-sensitive record layer on an exposed surface. This second record surface is secured to the first record surface, by a binder layer, to form a double-surface heat-sensitive record material having opposed, exposed heat-sensitive record layers. A thermal imager or printer can then print on both exposed heat-sensitive record layers. The release liner enables the two record layers to be separated, forming first and second printed surfaces, wherein the first printed surface has an exposed pressure-sensitive adhesive layer so that it can be readily used as a label, while the second printed surface may be used as a receipt.

Abstract: A reversible thermosensitive coloring composition is composed of (i) an electron-donor coloring compound and (ii) an electron-acceptor compound selected from the group consisting of an organic phosphoric acid compound, an aliphatic carboxylic acid, and a phenolic compound, each having a straight chain or branched chain alkyl group or alkenyl group having 12 or more carbon atoms, the electron-donor coloring compound and the electron-acceptor compound being capable of reacting to induce color formation in the reversible thermosensitive coloring composition at the eutectic temperature thereof. The electron-donor coloring compound and the electron-acceptor compound, when fused and colored in a mixed state, with application of heat thereto, followed by rapidly cooling the fused mixture, exhibit an exothermic peak in a temperature elevation process in a differential scanning calorific anlaysis or in a differential thermal analysis.