Abstract: There is provided a heat sensitive recording sheet comprising a support and a heat sensitive color forming layer excellent in mechanical adaptability and recording characteristics and capable of providing clear copies. This recording sheet has a smoothness of at least 150 seconds measured according to JIS P8119, an opaqueness of 30-50% according to JIS P8138 and a stiffness in longitudinal direction of 35 or less in Clark value according to JIS P8143 and the support is a synthetic paper.

Abstract: A heat-sensitive recording paper comprising a support having coated thereon a heat-sensitive color-forming layer, wherein the support contains an inorganic fiber.

Abstract: A heat-sensitive record material having on a base sheet a recording layer which comprises a basic colorless chromogenic material and an acceptor in the state of that the colorless chromogenic material is contacted with the acceptor by heating to produce color images. The recording layer comprises at least one phenol compound represented by the following formula (I) together with the colorless chromogenic material and the acceptor, ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 radicals is hydrogen, C.sub.1-8 alkyl or C.sub.5-8 cycloalkyl, but at least one of R.sub.1, R.sub.2 and R.sub.3 radicals is C.sub.5-8 cycloalkyl; and each of R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 radicals is hydrogen or C.sub.1-8 alkyl.

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-sensitive recording paper is disclosed, comprising a paper support with a heat-sensitive color forming layer provided thereon, wherein the paper support has an internal bonding force of from 0.5 to 2.0 kg.multidot.cm and a cobb water absorption of 10 to 20 g/m.sup.2. This recording paper avoids problems of sticking and piling, and is very suitable for use in high speed recording.

Abstract: A multicolor heat-sensitive recording material is disclosed, comprising a support having carried thereon at least two colorless or light-colored color formers capable of developing different colors and color developers capable of reacting with said color formers upon heating to develop colors, wherein at least one of the color formers and color developers is encapsulized, at least one of the color formers is a diazo compound which is substantially decomposed by light, and at least one of the other color formers is a compound which is not substantially decomposed by light. The material provide a multicolor image having excellent hues and sharpness without color smearing and is free from undesired color formation before or after recording.

Abstract: A novel heat-sensitive recording material is provided comprising a support, a heat-sensitive coloring layer containing an electron donating dye precursor which is normally colorless or light-colored and an electron accepting compound which exhibits a color upon reaction with said dye precursor, a first protective layer containing a polyvinyl alcohol resin and a second protective layer containing a silicon-containing denaturated polyvinyl alcohol, a colloidal silica and/or amorphous silica, wherein either of the first or second protective layer may be coated directly on said coloring layer.

Abstract: This invention discloses a heat sensitive recording material having a heat sensitive layer on a support; either of a color forming material or a developer which are contained in the heat sensitive layer is encased in a microcapsule. Since a plasticizer for a wall material of the microcapsule and a compound having an effect to depress the melting point of at least one member out of developers, a color forming reaction is carried out smoothly under a recording condition, therefore, a density of an obtained image is sufficient. Especially good results are obtained when a macromolecule substance selected from a group of polyurethane, polyurea, polyamide, polyester and polycarbonate is used as a wall material of the microcapsule. A coloring reaction assistant may be contained in any place of the heat sensitive layer.A preferable plasticizer can be selected from a group of phenols, alcohols, ureas, sulfonamides, carbamates and aromatic methoxy compounds.

Abstract: A heat-sensitive recording paper is described, comprising a paper support having formed thereon a heat-sensitive color forming layer, wherein said paper support is subjected to surface sizing with a synthetic sizing agent so as to have a Cobb-water absorption degree as defined by JIS-P-8140 of 25 g/m.sup.2 or less.

Abstract: A microcapsule-coated paper for a pressure-sensitive copying paper comprising a base paper having coated thereon consecutively (a) a subbing layer and (b) a coated layer including microcapsules wherein said subbing layer is capable of aggregating said microcapsules.

Abstract: There is disclosed a thermosensitive recording material improved in thermal response and image retention which comprises a support and, provided thereon, a thermosensitive recording layer containing a generally colorless or slightly colored dye precursor and a developer which, upon being heated, reacts with said dye precursor to develop color, wherein said thermosensitive recording layer contains as sensitizer a compound selected from a group consisting of p-benzylbiphenyl, diaryl esters of adipic acid, ##STR1## (wherein R represents a substituted or unsubsitituted aralkyl group), ##STR2## (wherein R.sub.1 and R.sub.2 each represents an alkyl, aralkyl, or aryl group), and ##STR3## and said developer is bis(3-allyl-4-hydroxyphenyl)sulfone.

Abstract: A novel heat-sensitive recording material comprising a support having coated thereon a heat-sensitive coloring layer containing a colorless or light-colored electron donor dye precursor and an electron acceptor compound which colors upon reaction with said electron donor dye precursor and a protective alyer coated on the heat-sensitive coloring layer comprising a saponified product of a vinyl acetate-acrylamide copolymer or vinyl acetate-methacrylamide copolymer having an acrylamide or methacrylamide content of about 0.5 to about 80% by weight.

Abstract: A protective coating is applied to a thermally reactive material layer in laminate manner. The coating includes a fluorocarbon sizing agent which causes beading of any adverse material and prevents penetration thereof into the thermally reactive material. A combined color developing and dye formulation includes bisphenol, wax, clay and dye in a binder of polyvinyl alcohol which effects a spreading of any adverse material on the surface of the coating.

Abstract: This invention relates to a method of recording an image, characterized by superposing a heat-sensitive transfer medium on a plain paper and heating the medium thereby transferring a leuco dye from a leuco dye-containing transfer layer and a developer from a developer-containing transfer layer respectively onto the plain paper to react the leuco dye and the developer, said heat-sensitive transfer medium being prepared by having a transfer layer containing a leuco dye as the main component and a transfer layer containing a developer as the main component respectively applied on a single substrate or two separate substrates.

Abstract: A pressure-sensitive recording sheet is described, comprising a base paper having coated thereon a color developer solution wherein said base paper has been sizepressed or coated with a cationic sizing agent.

Abstract: A pressure sensitive recording sheet which uses specified raw paper as a paper support. The raw paper has a fiber length distribution such that the total amount of a percentage by weight of a 24 mesh residue and that of a 42 mesh residue is 65% or less by weight of the total residue as determined in accordance with the fiber classification method (JIS P-8207) and thereby both decreased process fog and increased color density of the developed images are attained.

Abstract: A thermosensitive recording material comprising (a) a support material, (b) an undercoat layer formed thereon, comprising a polyvinyl alcohol having a saponification ratio ranging from 80 mole % to 95 mole %, which serves as water-soluble binder agent, a first water-resisting-property-improvement agent and a first organic filler, (c) a thermosensitive coloring layer formed on the undercoat layer, comprising a leuco dye, a color developer capable of inducing color formation in the leuco dye upon application of heat thereto and the same polyvinyl alcohol as first mentioned and (d) an overcoating layer formed on the thermosensitive coloring layer, comprising the same polyvinyl alcohol as first mentioned, a second water-resisting-property-improvement agent and a second organic filler.

Abstract: A heat-sensitive record material having a thick base support consisting of at least two base sheets and at least one binder layer, said base support weighing at least 150 g/m.sup.2 and having an excellent dimensional stability without accompaniment of any cockles and any background fogginess. It is particularly suitable for use in providing tags, tickets, cards, price marks etc. A process for the production of said heat-sensitive record material by the use of a binder consisting essentially of at least one thermoplastic polymer for which the vicat softening temperature is 20.degree. C. to 180.degree. C. and preferably 30.degree. C. to 160.degree. C.

Abstract: A heat-sensitive recording material is disclosed, comprising a heat-sensitive layer containing a normally colorless or slightly colored dye precursor and a compound capable of reacting with the dye precursor to form color, with at least one of the heat-sensitive layer, an interlayer, and a protective layer containing polyvinyl alcohol as an adhesive and a hardener represented by formula (I) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents a hydrogen atom, a halogen atom, a saturated or unsaturated hydrocarbon group containing from 1 to 6 carbon atoms, or a saturated or unsaturated hydrocarbon group containing from 1 to 20 carbon atoms and at least one ether bond.

Abstract: A sheet material for use in the production of multi-part pressure sensitive adhesive articles such as labels. In one of its forms, the sheet material consists carbonless paper having a coating or film of a silicone release agent on the imageable side thereof. In other of its forms, a coating or layer of a polymer composition, which acts to accelerate curing the silicone release agent, is interposed between the imageable side of the self-contained carbonless paper and the coating or film of silicone release agent.

Abstract: Thermosensitive recording material comprising a support, a polyolefin resin layer and a thermosensitive coloring layer, both formed on one side of the support in this order. The thermosensitive coloring layer is made of a dispersion, in a binder, of a colorless or pale-colored leuco dye and an acidic material capable of color formation of the leuco dye when it is heated. When a pressure-sensitive adhesive layer and a release paper are formed on the other side of the support in this order, the thermosensitive recording material can be used as a thermosensitive recording label.

Abstract: A thermosensitive recording adhesive sheet capable of forming colored images thereon upon application of heat, comprising (a) a support material with print patterns on the front side or back side thereof, (b) a thermosensitive coloring layer formed on the support material, (c) an adhesive layer formed on the back side of the support material, opposite to the thermosensitive coloring layer, and (d) a disposable backing sheet which is attached to the adhesive layer and can be peeled off the adhesive layer when the thermosensitive recording adhesive label is used. When necessary, (e) a protective layer for protecting the thermosensitive coloring layer and for improving the thermal head matching properties of the thermosensitive coloring layer can be formed on the thermosensitive coloring layer.

Abstract: This invention relates to a water resistant composition which comprises (A) polyvinyl alcohol, (B) a chitosan of which aqueous 1% solution has a viscosity not greater than 70 centipoise at 20.degree. C. and (C) an aldehyde compound, as well as a heat-sensitive recording sheet which comprises said composition. The composition has excellent water resistant properties and the heat-sensitive recording sheet has improved color forming properties and excellent resistance to water and solvents.

Abstract: The invention relates to chromogenic 3,3-bisindolyl-4-azaphthalides of the general formula ##STR1## wherein Y.sub.1 is hydrogen, C.sub.1 -C.sub.12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or is C.sub.1 -C.sub.12 acyl, benzyl or benzyl substituted halogen, nitro, lower alkyl or lower alkoxy,Y.sub.2 is C.sub.5 -C.sub.12 alkyl, preferably C.sub.6 -C.sub.9 alkyl, which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, andZ.sub.1 and Z.sub.2, each independently of the other, are hydrogen, lower alkyl or phenyl, and the rings A and B, each independently of the other, are unsubstituted or substituted by halogen, nitro, cyano, lower alkyl, lower alkoxy, lower alkoxycarbonyl, amino, mono-lower alkylamino or di-lower alkylamino.These compounds are particularly suitable for use as color formers in pressure-sensitive or heat-sensitive recording materials and produce fast, strong red or violet colorations.

Abstract: A thermosensitive image transfer medium is disclosed which consists essentially of (i) an image transfer sheet comprising (a) a plastic film, (b) an undercoat layer formed thereon containing a porous filler having an average particle size of 1 to 10 .mu.m and an oil absorption of 200 ml/100 g or less as measured in accordance with the Japanese Industrial Standard K 5101, with a depostion of the porous filler ranging from 1 g/m.sup.2 to 10 g/m.sup.2 and (c) an image transfer layer comprising a leuco dye formed on the undercoat layer, and (ii) an acceptor sheet having an acceptor layer comprising a color developer which is capable of inducing color formation in the leuco dye.

Abstract: A pressure sensitive manifold sheet characterized in that a chelate record material comprising an iron (III) compound and/or a vanadium compound, and an aromatic compound having at least one of hydroxyl group and mercapto group on the aromatic ring in combination therewith is used further in combination with an infrared absorbing organic compound.

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: A pressure-sensitive recording sheet capable of providing colored images by a reaction of a substantially colorless electron donating dye precursor and an electron accepting developer is described, wherein a layer comprising the electron accepting developer of the pressure-sensitive recording sheet contains (1) a metal salt of an aromatic carboxyl acid, and (2) at least one of a 2-mercaptobenzothiazole and a 2-mercaptobenzimidazole.

Abstract: A heat-sensitive recording material comprising a support having provided thereon a heat-sensitive recording layer, the heat-sensitive recording layer containing a diazo compound encapsulated in microcapsules and a component capable of undergoing a color forming reaction with said diazo compound, wherein a protective coating layer containing as a binder a modified polyvinyl alcohol containing silicon atoms, and at least one of colloidal silica and amorphous silica is applied on the surface of the heat-sensitive recording layer.

Abstract: A heat-sensitive recording paper comprising a support having provided thereon a heat-sensitive recording layer, wherein an intermediate layer comprising at least one of an organic and inorganic pigment having an oil absorption property (JIS K-5101) of at least 30 ml/100 g and less than 50 ml/100 g is interposed between the support and the heat-sensitive recording paper. The heat-sensitive recording paper does not suffer from reduction in color density even when recording is effected with high energy.

Abstract: A heat-sensitive recording paper is described, comprising a paper support having thereon a heat-sensitive color forming layer, wherein said paper support contains at least 10% by weight of a pigment and has an internal bonding strength as defined by Tappi-RC-308 of from 0.5 to 2.5 kg.cm.

Abstract: A heat-sensitive recording sheet comprising:(a) a support sheet;(b) a thermo-sensitive color forming layer formed on the said support sheet, said thermo-sensitive color forming layer comprising a colorless to pale color leuco dye and an acidic material capable of coloring the colorless to pale color leuco dye when heat is applied thereto;(c) an over-coat layer formed on the said heat-sensitive, color-forming layer, said over-coat layer comprising an inorganic silicate or a mixture of an inorganic silicate and a water-soluble, high-molecular compound or a slightly water-soluble high-molecular compound.The said heat-sensitive recording sheet has a reduced property of sticking of coatings and/or dreg to a thermal head during recording and gives a developed image which is not faded by contact with plasticizer, oil, fat or water.

Abstract: The fluoran compounds of the formula (I) are new red color forming chromogenic dyes. ##STR1## wherein R represents an isobutyl or isopentyl group, R.sub.1 represents a hydrogen or halogen atom or an alkyl group, R.sub.2 represents a hydrogen or halogen atom or an alkyl group, R.sub.3 represents a hydrogen atom, and R.sub.4 represents a hydrogen atom, or R.sub.4 and R.sub.1 as well as R.sub.2 and R.sub.3 taken together with the carbon atoms to which they are attached may form a benzene ring which may be substituted with a halogen atom. They are used, together with an acidic developer, in chromogenic recording materials for use in pressure sensitive copying paper, heat-sensitive recording paper and thermo-sensitive, reversible color changing composition.

Abstract: A self-contained type pressure sensitive record sheet prepared by coating a substrate with a mixture of microcapsules containing a color former and an inorganic solid acid as a color acceptor and drying the resulting coating, the mixture containing 10 to 30% by weight of polyvinyl alcohol based on the weight of the inorganic solid acid.

Abstract: Disclosed is a pressure-sensitive record unit which comprises a top sheet having coated on the underside thereof solid color former material and a bottom sheet having coated on the upper side thereof a coating comprising solid color developer material and microcapsules containing a liquid solvent for the color former. Such a record unit makes possible the unexpectedly efficient utilization of the color former material. It furthermore permits the printing application of some of the components, resulting in even more efficient utilization of color former material and elimination of undesirable side effects of printed record units taught in the prior art.