Abstract: A recording material is described comprising an electron donating colorless dye, an electron accepting compound, and at least one compound represented by formula (I), (II), or (III)Ar.sub.1 O--R--SAr.sub.2 (I)Ar.sub.1 S--R--SAr.sub.2 (II)Ar.sub.1 S--R--X--Ar.sub.2 (III)wherein Ar.sub.1 and Ar.sub.2 each represents a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic ring, R is a divalent group containing from 1 to 10 carbon atoms, and X represents --COO-- group or ##STR1## group.

Abstract: A pressure-sensitive recording sheet is disclosed. The sheet comprises a support having provided thereon a color-forming layer containing microcapsules prepared by encapsulating oil droplets having dissolved therein one or more substantially colorless color formers, wherein said microcapsules contain a compound represented by formula (I) ##STR1## wherein A and B each represents an alkylene group having from 1 to 12 carbon atoms or an alkenylene group having from 2 to 12 carbon atoms; R represents an alkyl group having from 1 to 18 carbon atoms; and n represents an integer of from 5 to 50.

Abstract: A recording sheet comprising microcapsules containing a substantially colorless electron donating dye, a diarylaminofluoran derivative, and a quinoline derivative represented by formula (I) ##STR1## wherein R.sub.1 represents a hydrogen atom, an alkoxy group having from 1 to 8 carbon atoms, an aryloxy group having from 6 to 18 carbon atoms or an aralkyloxy group having from 7 to 18 carbon atoms; R.sub.2 represents a hydrogen atom or a methyl group; and n is an integer of 1 to 10. The recording sheet has a layer of microcapsules which does not turn blue on the surface thereof and does not experience any color staining where a surface of the coating is cut.

Abstract: A heat-sensitive recording material comprising a support having provided thereon a heat-sensitive color-forming layer which contains a colorless or slightly colored electron-donating dye precursor and an electron-accepting compound capable of reacting with the electron-donating dye precursor to form color, wherein the heat-sensitive color-forming layer further contains at least one of the compounds represented by the general formulae (I) to (VI) shown in the specification and at least one of the compounds represented by the general formulae (VIII) to (XII) shown in the specification, or wherein the heat-sensitive color-forming layer further contains about 0.5 wt % to less than about 20 wt %, based on the electron-accepting compound, of the compound represented by the general formula (XIII) shown in the specification. The heat-sensitive recording material obtained provides a high density color image and does not undergo a decrease in heat responsibility and an increase in background fog formation.

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: A heat-sensitive recording material containing a special sensitizer in a heat-sensitive recording layer is excellent in thermal response and sensitivity.

Abstract: A thermosensitive recording sheet having a coated film containing a color-forming lactone compound, an acidic substance and a sensitizer. The sensitizer is at least one aliphatic carboxylic acid ester represented by the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and each represents an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, an aryl group, a group of the formula --C.sub.n H.sub.2n --Ar in which n is an integer of 1 to 8 and Ar is an aryl group, or a group of the formula --C.sub.n H.sub.2n --CO--Ar in which n and Ar are as defined; R.sup.3 represents a group of the formula --C.sub.n H.sub.2n --in which n is as defined; R.sup.4 and R.sup.5 are identical or different and each represents an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, a group of the formula --C.sub.n H.sub.2n --Ar in which n and Ar are as defined, or a group of the formula --C.sub.n H.sub.2n --CO--Ar in which n and Ar are as defined; and R.sup.

Abstract: In a heat-sensitive recording material comprising a colorless or pale-colored basic dye and an electron accepting reactant material which is reactive with the basic dye to form a color when contacted therewith, and comprising at least one of the specific phthalide derivatives as the basic dye, the heat-sensitive recording material characterized in that at least one compound selected from the group consisting of the specific fluorene derivatives and the specific p-phenylenediamine derivatives is further contained in the recording material.

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 recording material comprising a support having provided thereon, microcapsules containing a basic leuco dye dissolved in an organic solvent is disclosed. The microcapsules further contains at least one compound selected from the group consisting of 2-mercaptobenzothiazoles, guanidines, thioureas, 2-mercaptoimidazolines and thiurams. The recording material is free from coloration due to exposure to light and provides a recorded image of high density and high contrast.

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 heat-sensitive recording material is described, comprising a support having provided thereon a recording layer comprising a diazo compound and a coupling component, wherein the improvement comprises including said diazo compound and at least one compound selected from a polymerizable compound containing an ethylenically unsaturated bond therein or at least one compound capable of releasing a free radical upon exposure to light together in microcapsules.

Abstract: Correction compositions for correcting markings provided on the surface of a pressure-sensitive chemical recording medium carrying a developer material which comprises an acidic developer by interaction of the developer material with a color-providing material. The compositions comprise a substantially uniform dispersion of an opacifying pigment, a polymeric film-forming material, and a Lewis acid. The composition is applied to a marking to provide a film which covers the marking, and a visible correcting marking can be provided on the film by applying a pattern of color-providing material corresponding to the corrected marking to the film.

Abstract: A thermosensitive recording material is disclosed, which comprises a support material and a thermosensitive coloring layer formed thereon comprising a leuco dye, a color developer capable of inducing color formation in the leuco dye upon application of heat thereto, and a diether compound having the following general formula (I): ##STR1## wherein R represents a straight or branched hydrocarbon having 2 to 12 carbon atoms, including 1 to 4 double bonds therein, X and Y each represent an alkyl group having 1 to 6 carbon atoms; an alkoxy group having 1 to 6 carbon atoms; halogen; an aryl group; an aralkyl group; an acyloxy group (R'COO--), wherein R' is an alkyl group having 1 to 6 carbon atoms; an aryloxy group; or an aralkyloxy group; and m and n each represent an integer of 1 to 3.

Abstract: A thermosensitive recording sheet having a thermosensitive color developing layer containing a basic leuco dye and an organic color developer, said organic color developer consisting of at least partly of a halogen-substituted benzoic acid zinc salt represented by the following general formula ##STR1## wherein X.sub.1 represents a halogen atom, X.sub.2 represents a hydrogen or halogen atom, and R.sub.1, R.sub.2 and R.sub.3, independently from each other, represent a hydrogen atom or an alkyl, alkoxy, cycloalkyl, nitro, cyano or hydroxyl group.

Abstract: A heat sensitive recording sheet including p-benzyloxybenzoic acid benzylester and filler in its color-forming layer which contains a basic colorless or pale-colored chromogenic dyestuff and an organic color-developing agent whereby a heat sensitive recording sheet having a highly stable developed image against oily substances such as hair oil, sweat, etc. is provided without deteriorating the fundamental qualities of the heat sensitive recording sheet.

Abstract: A heat-sensitive recording material excellent in stability of recorded images is disclosed, which comprises a support having formed thereon a heat-sensitive recording layer comprising a colorless or pale-colored basic dye and a color developer capable of forming a color upon coming into contact with the basic dye, wherein said heat-sensitive recording layer further comprises at least one compound selected from the compounds represented by following formulae (I) and (II): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8 independently represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms.

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: Heat-sensitive recording materials comprising a colorless or light-colored dye precursor and a color developer capable of developing a color of the dye precursor, upon reaction with said dye precursor with heating, further contain as sensitizers specific styryl-containing compounds. By incorporating these specific sensitizers, the heat-sensitive recording materials provide excellent thermal response and high sensitivity.

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: 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 highly sensitive thermal recording material excellent in response to heat is obtained by incorporating as a sensitizer at least one compound into a thermal printing material comprising a usually colorless or light-colored dye precursor and a developer which reacts with each other to develop color on heating, said compound being selected from the following compounds represented by the following general formulas (I), (II) and (III): ##STR1##

Abstract: A recording material is described, containing (A) an electron-donating colorless dye and (B) an electron-accepting compound, wherein the electron-accepting compound is a compound represented by formula (I) ##STR1## wherein R.sup.1 represents an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, or an aryloxyalkyl group, Y.sup.1 is an alkyl group, an alkoxyl group, a halogen atom, or a hydrogen atom, and m is 0, 1 or 2.

Abstract: An improved heat sensitive coating composition and heat sensitive paper for thermal printing containing the composition are disclosed. The composition contains a color-forming amount of a finely divided solid colorless or pale colored chromogenic fluoran dyestuff, a color-developing amount of a finely divided mixture of benzyl p-hydroxy benzoate and a halogenated derivative of 4,4'-isopropylidenediphenol and a carrier composition.

Abstract: A heat-sensitive recording material contains, in its heat-sensitive, color-developing layer comprising a leuco dye and an organic acid that reacts with said leuco dye to develop color upon heating, a hydrocarbon compound melting at a temperature in the range from 50.degree. C. to 200.degree. C. and selected from benzylbiphenyls, alkyl-substituted benzylbiphenyls, hydrogenated benzylbiphenyls, hydrogenated alkyl-substituted benzylbiphenyls, hydrogenated terphenyls and hydrogenated alkyl-substituted terphenyls. With its quick thermal response, this material is suitable for high-speed recording.

Abstract: Disclosed is a heat-sensitive color-forming recording material which comprises a recording layer comprising a particulate phenolic color developer and a particulate leuco pigment, which are dispersed in a binder independently from each other, wherein the phenolic color developer and/or leuco pigment is present in the form of compatible solid particles with a substantially inactive organic solid medium having a melting or softening point lower than that of the phenolic color developer and/or leuco pigment and said organic solid medium is present in said compatible solid particles in an amount .[.2 to 250 times as large as.]. .Iadd.of 0.2 to 250% by weight, based on .Iaddend.the amount of the phenolic color developer and/or leuco pigment on the weight base. This heat-sensitized color-forming recording material is highly sensitive without substantial increase of the fog density.