Abstract: A coating composition for producing a layer composite, including a) a modified or unmodified polyvinyl alcohol, b) an alkylene/(meth)acrylic acid copolymer, c) a crosslinker, and d) one, two or more than two, pigments. The layer composite is used as food packaging, entry ticket, gaming ticket, car park ticket, or the like. A mixture of alkylene/(meth)acrylic acid copolymer and modified or unmodified polyvinyl alcohol is used in a layer of a layer composite, to the use of a coating composition for producing a layer composite.

Abstract: Provided are a material for pressure measurement, including a color forming layer that contains microcapsules A encapsulating an electron-donating colorless dye precursor and microcapsules B not encapsulating an electron-donating colorless dye precursor, in which a volume standard median diameter D50A of the microcapsules A and a volume standard median diameter D50B of the microcapsules B satisfy Equation 1; a material composition for pressure measurement; and a material set for pressure measurement: D50A<D50B??Equation 1.

Abstract: A temperature detecting material comprises a first material containing a first temperature indicating material and a second material containing a second temperature indicating material, wherein the first temperature indicating material and the second temperature indicating material contain a leuco dye, a color developing agent, and a decoloring agent, and have a hysteresis characteristic in their color density-temperature curves, wherein the first temperature indicating material has a color developing temperature in a temperature increase process lower than a decoloring temperature in the temperature increase process, and turns to a non-crystalline state and is kept in a decoloring state when cooled down below the color developing temperature in the temperature increase process with a predetermined cooling speed or more after melting, wherein the second temperature indicating material, a color developing temperature is lower than a decoloring temperature in the temperature increase process, and wherein the co

Abstract: The present invention relates to a compound for release agent and method for preparing the same, and more specifically, to a compound for a release agent that can be coated in an ultra-thin form without thermal deformation even when heat is continuously or discontinuously applied in a continuous evaporator, and a method for preparing the same.

Abstract: The invention relates to a radiation-curable precious-metal preparation, in particular a bright-gold preparation, that contains—in addition to a gold compound, which in particular is soluble in the printing medium, and further customary organometallic compounds—a radiation-curable, in particular UV-curable, printing medium, the polymerisation being initiated by the UV radiation and proceeding in accordance with a cationic mechanism which may optionally be assisted by y process that takes place simultaneously in accordance with a radical mechanism. The invention also relates to a transfer picture containing the precious-metal preparation, and to a process for decorating substrates that are suitable for decoration firing by direct application/printing and indirect printing (decalcomania).

Abstract: A method of producing a heat-sensitive transfer image-receiving sheet having, on a support, a heat insulation layer and a receptor layer, having a step of: forming both the heat insulation layer and the receptor layer by an aqueous simultaneous multilayer coating; wherein the heat insulation layer has at least one kind of hollow polymer particles and at least one resin having a glass transition temperature (Tg) in the range from 20° C. to 80° C.

Abstract: A coating includes an antenna uniformly distributed in both a matrix and a leuco-dye phase of the coating. A method for preparing an imaging material includes providing a powder having an activator and an antenna, dissolving the activator/antenna powder to form an activator/matrix pre-polymer solution, providing a leuco-dye alloy, and dispersing the leuco-dye alloy into the activator/matrix pre-polymer solution to form a radiation-curable paste. An image-recording medium includes a matrix having an antenna and an activator, and an alloy dispersed in the matrix as an independent phase. The alloy includes an antenna, a leuco-dye, and an accelerator.

Abstract: An information recording-displaying card, includes: a core sheet; and an over sheet bonded to the core sheet, including: a support including an amorphous polyester resin, and a reversible thermosensitive recording layer disposed on the support, including: an electron-donating coloring compound, and an electron-accepting compound. The reversible thermosensitive recording layer is capable of relatively forming a coloring state and a decolorizing state, with a difference in at least one of heating temperature, and cooling rate after heating. The over sheet is embossable in an upper portion thereof, functions as an image displaying section, and meets the following condition (A) and condition (B): (A) (the over sheet's upper limit temperature for erasing ?30° C.)?(temperature of a storage elasticity E? (1.0 E+08) Pa)?200° C., and (B) 1.0 E+04 Pa?(the storage elasticity E? of the over sheet at 180° C.)?5.0 E+07 Pa.

Abstract: An information recording-displaying card, includes: core sheet; and over sheet bonded to core sheet, including: a support including an amorphous polyester resin, and a reversible thermosensitive recording layer on the support, including: an electron-donating coloring compound, and an electron-accepting compound. The reversible thermosensitive recording layer is capable of forming coloring state and decolorizing state, with difference in at least one of the following: heating temperature, and cooling rate after heating. The over sheet is embossable in upper portion thereof, functions as image displaying section, and meets the following conditions (A), (B) and (C): (A) (over sheet's upper limit temperature for erasing?30° C.)>(over sheet's temperature of storage elasticity E? (1.0 E+08) Pa), (B) 10 ?m or less of surface waviness WCM, and (C) 1.0 E+02 Pa?(storage elasticity E? of reversible thermosensitive over sheet at 180° C.)?5.0 E+07 Pa.

Abstract: A thermosensitive recording material comprising a support such as paper bearing thereon a first layer comprising multivoided particles and, disposed on the first layer, a thermosensitive recording layer is provided.

Abstract: The inkjet recording sheet substrate of the present invention comprises a cellulosic sheet support, e.g., paper, having on at least one surface thereof a base coating comprising pigment and binder. The preferred pigment component is a 50/50 mixture of kaolin clay and calcined clay, and the preferred binder component is polyvinyl acetate. This combination of binder and pigment has been found to possess a high absorption capacity for the vehicle of an inkjet ink and good compatibility with ink receptive top coatings applied over the base coat.

Abstract: An aqueous composition is disclosed for finishing fibrous material for a thermal transfer printing process comprising a) 0.5 to 2.5 percent by weight of a synthetic resin precondensate, b) 10 to 30 percent by weight of a thermoplastic plastic with reactive groups, c) 0.1 to 1.0 percent by weight of an inorganic salt with an acidic reaction, d) 0.2 to 2.0 percent by weight of a softening agent, and e) 0.05 to 0.5 percent by weight of an emulsifier. The disclosure is further directed to the use of the composition for a thermal transfer printing process and a thermal printing process.

Abstract: Chromogenic compounds of colorless or lightly colored form are disclosed having the following structural formula: wherein E represents a six-membered aromatic or heterocyclic ring which may have an aromatic condensed ring and both the E ring and the condensed ring may be substituted. Each of R1, R2, R3 and R4 independently represents hydrogen, alkyl of not more than 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy or represents cycloalkyl, phenyl, benzyl, or phenyl or benzyl which is substituted by halogen, lower alkyl or lower alkoxy or R1 and R2 or R3 and R4 together with the nitrogen atom to which they are attached represent a 5- or 6-membered heterocyclic radical. Each of R7 and R8 independently represents hydrogen, lower alkyl, lower alkoxy or halo. The compounds of this invention are eligible for use in pressure-sensitive and heat-sensitive record materials and manifold marking systems.

Abstract: A recording medium comprises one or more of the compounds represented by General Formula (1) and/or General Formula (2): wherein R is any of a hydrogen atom, a substituted or unsubstituted alkokyl group, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted aryl group; wherein R1 is an alkyl group of 1 to 20 carbons, and R2, R3, R4, and R5 are respectively independently an alkyl group of 1 to 3 carbons.

Abstract: The invention relates to a method for producing on a flexible film reflecting images which can be hot-transferred to a plurality of different materials, the method comprising a first processing step in which a polyester film is processed by a thermoplastic resin in a aromatic solution, a second processing step in which on the film are deposited a plurality of glass beads, in an adjoining relationship, a resin priming processing step for allowing the glass beads to be properly retained in place, a processing step of using a vinylchloride-vinylacetate-aromatic solvent solution with an addition of a metal powder having high mirror-like properties in order to allow the glass beads to refract the light, and a color printing step for printing any desired colors on desired regions, as well as a further leveling processing step for the images, and a final processing step of using a thermo-transfering solution in order to allow the printed images to be transferred under temperature and pressure.

Abstract: The present invention is directed to recording materials characterized in that the recording materials comprise at least one of diphenyl sulfone derivatives represented by the following general formula (I); ##STR1## wherein Y represents a linear or branched (un)-saturated C.sub.1 -C.sub.12 hydrocarbon group, a C.sub.1 -C.sub.8 hydrocarbon group having an ether linkage, or a group represented by a general formula; ##STR2## wherein R represents methylene or ethylene; R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represent each independently lower alkyl or lower alkenyl; m represents 0 or an integer of 1 or 2,; and n, p, q and r represent each independently 0 or an integer of 1 to 4, provided when n, p, q and r are each 2 or above, the substituents represented by R.sup.1, R.sup.2, R.sup.3 and R.sup.4 may be each different from one another.

Abstract: A thermal sensitive recording medium which has a feature to change the color of recorded pattern slowly and spontaneously after development, and the recorded pattern which has several days passed can be easily distinguished from that of just after development. Said thermal sensitive recording medium contains 4-hydroxybenzoic acid ester represented by general formula (I) as a color developer and uses triphenylmethane-based leuco dye and reddish color developing leuco dye whose maximum absorption wave length is 450.about.560 nm as a dye precursor. ##STR1## In this formula, R represents unsubstituted or substituted lower alkyl group of carbon number 1-7 or benzyl group.

Abstract: An internal phase solution for a coating of rupturable material for application to a base sheet to form a pressure-sensitive record material comprises one or more color-formers of which at least 90% are monoamino and/or diamino fluoran derivatives dissolved in a solvent comprising 80% to 100% of one or more vegetable and/or animal oils. Preferably the color-formers comprise only monoamino and/or diamino fluoran derivatives and the solvent comprises only one or more vegetable and/or animal oils. Dissolution of the color-formers in the solvent may be place at a temperature in the range 100.degree. C. to 135.degree. C. and micro-capsules containing such color-former solution may be formed by conventional coacervation processes below 70.degree. centigrade.

Abstract: A thermally imagable business record, such as a form, label, tag, or the like is provided which may be activated to form human and/or machine readable images as well as different colored images. The record comprises a substrate having a thermally imagable coating on substantially its entire surface which forms a first color when activated, and having a desensitized area on at least one area of its surface which may be overcoated with a thermally imagable coating capable of forming a different color upon activation than the first thermally imagable coating. The first thermally imagable coating provides images which are of machine readable quality, while the additional thermally imagable coatings provide images of a different color to designate selected areas on the form or label to a user.

Abstract: An improved thermally-responsive record material useful for bar coding is disclosed comprising a support having provided thereon in substantially contiguous relationship: a substantially colorless dye precursor comprising 2-anilino-3-methyl-6-dibutylaminofluoran; a sensitizer selected from the group consisting of 1,2-diphenoxyethane and 1,2-(4-methylphenoxy)ethane; an acidic developer material comprising bis-(3-allyl-4-hydroxyphenyl)sulfone which upon being heated reacts with said dye precursor to develop color; and a binder material. The improved thermally-responsive record material and bar code of the invention has a high print contrast signal; high dimensional stability in terms of low bar width growth degradation; a high percentage of successful decodes; and high contrast of the bar code with the background. The invention overcomes difficulties in past efforts to bring together a confluence of these characteristics in one coating formulation.

Abstract: The present invention is directed to a method of preparing a carbonless paper by ink jet application of molten particles before or after application of capsules.

Abstract: Disclosed are diazahemicyanine hydrophobic cationic dyes represented by the formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are lower alkyl groups having not more than 5 carbon atoms, R.sup.5 is a lower alkyl group having not more than 5 carbon atoms or a lower alkoxy lower alkyl group having not more than 6 carbon atoms, and Z.sup.- is a counter ion having a hydrophobic organic group, and a thermal transfer ink ribbon having a substrate and and ink layer laminated thereon containing said cationic dye.

Abstract: This invention includes novel 2,5-bis-?bis?(4-amino)phenyl!hydroxymethyl!substituted furan, thiophene, and pyrrole color-forming compounds and the reaction of these compounds or 2-mono-?bis?(4-amino)phenyl!hydroxymethyl!substituted furan, thiophene, and pyrrole color-forming compounds to form colored compounds. The invention also includes the use of these color-forming compounds in the manufacture and imaging of thermal imaging papers and pressure-sensitive imaging papers.

Abstract: A novel thermally responsive record material is disclosed, comprising support having provided thereon in substantially contiguous relationship with electron donating dye precursor, an acidic developer material, a sensitizer, and a binder therefor. The sensitizer comprises at least two components, the first component comprising 2,2-bis(4-hydroxyphenyl)-4-methylpentane and the second component comprising a mixture of dimethyl terephthalate and 1,2-diphenoxyethane, the first component being in a range of weight ratios from 1:2 to 2:1 relative the second component, said second component comprising from 50 to 70% dimethyl terephthalate. The sensitizer is prepared by admixing the first component and the second component and grinding the sensitizer to a particle size of less than 1 micron.

Abstract: A process for the color recovery of vinyl plastics in which fluorescent optical whiteners are used to recover color from a vinyl plastic surface. A mild detergent and solvent is used to clean the surface and remove any accumulated films on the surface, after which the surface is dried. Coat(s) of a fluorescent solution is(are) then applied to the surface. The appearance of weathered and/or discolored vinyl plastics is restored with fluorescence in the blue to violet region of visible light without loss of reflectance when a UV absorbing fluorescent agent is used.

Abstract: A thermosensitive recording medium, having a support, an intermediate layer disposed thereon, and a thermal recording layer disposed on the intermediate layer, with the support being a plastic film or a synthetic paper having a thickness of less than or equal to 150 .mu.m, and the intermediate layer containing hollow particles having a volume ratio of hollow particle to total intermediate layer material of greater than or equal to 20% and having a thermal conductivity of the intermediate layer together with the support of less than or equal to 0.55 kcal/mh.degree.C. is provided which has improved properties such as reduced paper curl, excellent dot print reproducibility and sufficient adhesion between layers, and which is conveniently used in a wide variety of information recording applications.

Abstract: A thermosensitive recording material having a high degree of background whiteness, superior light resistance without coloring of the background when exposed to the light, and a method of producing a stable coating liquid or forming a thermosensitive coloring layer and a protective layer are provided.

Abstract: This invention generally relates to a reversible thermosensitive coloring composition and a thermosensitive recording medium using thereof which have high light-resisting characteristics, wherein coloring and decolorizing can be repeated suitably.

Abstract: Pressure-sensitive copying material comprises 3,1 benzoxazine chromogenic material(s) in a solvent comprising vegetable oil and/or a mono-, di or tri-functional ester of a non-aromatic mono-carboxylic acid having a straight or branched hydrocarbon chain with at least three carbon atoms in the chain in addition to the carboxyl carbon atom and an inorganic colour developer. The surface pH of the colour developer is not more than about 8.7, which gives rise to enhanced image intensity and fade resistance compared with the use of 3,1 benzoxazine chromogenic materials in the same solvent with the same colour developer at higher surface pH values.

Abstract: A process is disclosed for manufacturing paper web containing a CF layer for pressure sensitive recording paper. In order to ensure full sizing, the paper web is subjected to intermass sizing and the coating ink containing color acceptors constituted of color-reactive, mineral pigments is applied with a coating device in which the paper web is guided between two transfer rollers separated by a gap or set at minimal pressure. One of the transfer rollers applies volumetrically pre-dosed coating ink by means of a rotary and driven surface-profiled doctor bar, forming the CF layer on one side of the paper web, and the other transfer roller at the same time applies a volumetrically pre-dosed aqueous solution on the other side of the paper web, also by means of a rotary driven surface-profiled doctor bar. The amount of color-reactive pigment in the dried CF-layer comprises between 3.5 and 5 g/m.sup.2.

Abstract: A blue dyestuff represented by the formula (2) ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 is independently a hydrogen atom, halogen atom, nitro group, hydroxy group, alkyl group which may have a substituent, alkoxy group, alkylsulfonylamino group or alkylcarbonylamino group, and each of R.sub.4 and R.sub.5 is independently an alkyl group which may have a substituent, and a heat-sensitive transfer sheet containing the above-mentioned dyestuff.

Abstract: A thermosensitive recording material having an enhanced color-developing property and a high persistency of the resultant colored images formed thereon, is provided with a thermosensitive colored image-forming layer formed on a substrate sheet and comprising a substantially colorless dye precursor and a color developing agent comprising at least one aromatic compound of the formulae (I) and (II): ##STR1## wherein X and Y are an oxygen or sulfur atom, R.sup.1 is an alkyl, cycloalkyl, alkenyl or alkynyl group or a hetero atom-containing alkyl, cycloalkyl or alkenyl group having at least one hetero atom included in a backbone group thereof, R.sup.2 is an aryl or aralkyl group or a substituted aralkyl group having at least one hetero atom substituent, R.sup.3 is an unsubstituted aralkyl group or substituted aralkyl group having at least one hetero atom substituted in an aliphatic hydrocarbon group thereof, and R.sup.

Abstract: A thermosensitive recording material capable of being imagewise colored when heated, having a support, and a thermosensitive recording layer formed thereon which contains an N-substituted indole or an aromatic polyhydroxy compound, a carbonyl compound, and an acid material.

Abstract: An imaging process uses an imaging medium comprising a polymer having a plurality of first groups. This polymer is imagewise contacted with an imaging reagent comprising a plurality of second groups, thus causing, in the areas of the medium exposed to the imaging reagent, the second groups to react with the first groups and form a colored material, and thereby forming an image on the imaging medium. One of the first and second groups comprises a benzotriazinone or benzothiatriazine-4,4-dioxide benzotriazinone moiety and the other comprises a naphthol or a pyrazalone moiety.

Abstract: Disclosed is a novel recording material comprising an electron-providing colorless dye and an electron-accepting compound. The electron-accepting compound is represented by the following formula (1): ##STR1## wherein X represents a hydrogen atom, a halogen atom, a hydroxyl group, a carboxyl group, an alkoxycarbonyl group, an alkyl group, an alkoxy group, an allyl group, an aryl group, an aralkyl group or a cycloalkyl group; Ar represents an arylene group containing two to five benzene rings, an arylene group condensed with two to five benzene rings or a bisarylene group in which arylene groups are connected to each other via a divalent group; and R represents a hydrogen atom, an alkyl group, an aralkyl group or an aryloxyalkyl group. The invention also relates to the compounds of formula (1).

Abstract: A heat-sensitive recording material with a satisfactory whiteness and an enhanced heat-sensitivity is produced by a process comprising the steps of preparing a coating liquid containing a dye-precursor dispersion and a color developer dispersion, coating a surface of a sheet substrate with the coating liquid and solidifying the resultant coating liquid layer on the sheet substrate, in which process at least one member of the dye-precursor and the color developer is finely pulverized by at least one dispersing operation, in the presence of a pulverizing medium consisting of a number of solid grains having a diameter of 0.9 mm or less, into fine particles having an average size of 0.7 .mu.m or less.

Abstract: Provided is a plurality of ultra-violet light protection formulas in the form of liquids and creams which can be topically applied to various surfaces/substrates to protect such surfaces from the deleterious effects of light primarily in the ultra violet range and in addition, enhance the surface characteristics in some instances. The surfaces/substrates can by typically leather, vinyl, finished wood, unfinished wood, and a host of others too numerous to mention. An example of one formula is illustrated with an ultra-violet light indicating dye for use as an indicator.

Abstract: A base paper for use in the manufacture of printing paper used in low heat thermal printing operations. The base paper is provided by coating a paper sheet with a dispersion comprising hollow gas-containing spherical particles preferably of a synthetic polymer, a filler of clay particles, and a binder. The coating provides pigment, thermal insulation and aqueous holdout for a thermosensitive recording layer applied onto the coating and can be calendered to improve surface smoothness.

Abstract: A method of optically reading colored record images formed by the reaction of a substantially colorless electron donating dye and an electron accepting developer in a pressure-sensitive recording sheet with a red light having a wavelength of from 620 nm to 700 nm, wherein the pressure-sensitive recording sheet comprises an electron accepting developer layer containing a metal salt of an aromatic carboxylic acid as the electron accepting developer and an electron donating dye layer containing a phthalide compound represented by the following formula (1) as the electron donating dye: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; the R.sub.1 and R.sub.2 or the R.sub.3 and R.sub.4 may combine with each other to form a ring; R.sub.5 represents a hydrogen atom or an alkyl group; R6, R.sub.7, R.sub.8, and R.sub.

Abstract: Disclosed are a crystal and crystalline solvate of a fluoran compound represented by the formula ##STR1## wherein R.sub.1 is ##STR2## and which are useful as chromogenic compounds in recording materials such as pressure-sensitive and heat-sensitive recording materials, a process for preparation of said crystal and said crystalline solvate, and recording materials comprising said crystal or said crystalline solvate.

Abstract: A process for preparing a developer sheet on a forms press with little drying and a developer sheet are disclosed wherein an aqueous dispersion of a developer material containing about 50 to 80% solids is applied to the front surface of a substrate in a wet coat weight of about 0.75 to 1.5 pounds/1300 square feet; said dispersion comprising a developer material, an image intensifier, and a water miscible, non-volatile solids booster.

Abstract: There is described a pressure-sensitive recording and transfer material containing in a first sheet a coating comprising one of the components (A) and (B) or a solvent for these components and in a second sheet the other or both of the components (A) and (B) and an electron-attracting and colour-developing material as component (C),(A) being a polycyclic compound of the formula ##STR1## where X is a monocyclic or polycyclic aromatic or heteroaromatic radical, Y is a substituent which is detachable as an anion, Q.sub.1 is --O--, --S--, ##STR2## Q.sub.2 is --CH.sub.2 --, --CO--, --CS-- or --SO.sub.2 --, R is hydrogen, C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.10 cycloalkyl, aryl, such as phenyl, or aralkyl, such as benzyl, and the ring A, which may be substituted, is an aromatic or heterocyclic radical of 6 ring atoms with or without a fused aromatic ring which may likewise be substituted, and(B) being an organic condensation component.

Abstract: Disclosed are a crystal and crystalline solvate of a fluoran compound represented by the formula ##STR1## wherein R.sub.1 is ##STR2## and which are useful as chromogenic compounds in recording materials such as pressure-sensitive and heat-sensitive recording materials, a process for preparation of said crystal and said crystalline solvate, and recording materials comprising said crystal or said crystalline solvate.

Abstract: The addition, to a thermal imaging medium comprising a color-forming compound which undergoes a change of color upon heating above a color-forming temperature for a color-forming time, the color-forming compound being of the cyclic sulfonamide type described in U.S. Pat. Nos. 4,720,449 and 4,960,901, of a quinone or hydroquinone increases the sensitivity of the imaging medium and helps to prevent fading of images produced therefrom while the images are being projected.

Abstract: A color developing material is produced by:a) gradually adding a metal silicate solution to a solution of an aluminum salt which is initially at a pH below 4 until the pH of the resulting mixture is approximately 4, thereby to induce some precipitation and to form a sol;b) gradually adding alkali to said sol to raise the pH to approximately 7, thereby to induce further precipitation and gel the sol or further gel the sol, said gelled sol being a hydrated silica/hydrated alumina composite;c) separating the gel from the aqueous medium and washing the resulting product to remove dissolved salts; andd) drying the washed product and reducing it in particle size.This color developing material is then formulated into a coating composition, applied to a paper base and dried to produce a color developing record material as used in pressure-sensitive (carbonless) copying pape sets.

Abstract: The addition, to a thermal imaging medium comprising a color-forming compound which undergoes a change of color upon heating above a color-forming temperature for a color-forming time, the color-formingcompound being of the cyclic sulfonamide type described in U.S. Pat. Nos. 4,720,449 and 4,960,901,of a source of zinc, nickel, copper(II), cobalt(II) or aluminum(III) cations increases the sensitivity of the imaging medium and helps to prevent fading of images produced therefrom while the images are being projected.

Abstract: A heat-sensitive recording sheet of this invention comprises in a heat-sensitive color-developing layer both bis(4-hydroxyphenyl)butylacetate as an organic color-developing agent and a particular fluorane-leuco dye. This sheet provides an intense clear image less discoloration and superior heat-resistant preservability.

Abstract: Pressure- or heat-sensitive record material utilizes a chromogenic material of the formula (I) (Ia or Ib): ##STR1## in which: one of A.sub.1 and A.sub.3 is an optionally-substituted carbocyclic aryl group and the other of A.sub.1 and A.sub.3 is either an optionally-substituted aryl group which is the same as or different from A.sub.1, or an optionally-substituted nitrogen-containing aromatic heterocyclic group, with the proviso that if both A.sub.1 and A.sub.3 are aryl groups, then at least one of A.sub.1 and A.sub.3 has a substituted amino or -N-heterocyclic substituent in the 4- position (relative to the bond joining A.sub.1 or A.sub.3 respectively to the remainder of the molecule);A.sub.2 is hydrogen or an optionally-substituted aryl, alkyl or aralkyl group; andA.sub.4 is hydrogen or an optionally-substituted alkyl, aryl or aralkyl group.

Abstract: Disclosed are novel crystal of the fluoran compound represented by the formula ##STR1## , characterized by a specific X-ray diffraction diagram; preparation process thereof; and recording materials comprising the crystal.

Abstract: In a heat-sensitive recording material incorporating a colorless or pale-colored basic dye and a color acceptor which is reactive with the basic dye to form a color when contacted therewith, the recording material characterized in that at least one compound represented by the formula ?I! is contained in a heat-sensitive recording layer ##STR1## wherein X is --O-- or --COO--, R.sub.1 to R.sub.4 are each hydrogen atom, alkyl having 1 to 8 carbon atoms, aryl having 6 to 10 carbon atoms, aralkyl having 7 to 9 carbon atoms, chlorine atom, acetyl, propionyl, methoxy, methylthio, methoxycarbonyl, cyano, nitro or cyclohexenyl, substituents R.sub.1 and/or R.sub.2 or substituents R.sub.3 and R.sub.4 may link together to form aromatic ring(s), n is an integer of 1 to 10.