Abstract: A recording material containing the combination of at least one electron-donating colorless dye containing a p-substituted aminophenylindolyl azaphthalide and at least one electron-accepting compound containing an organic acid having at least one phenolic hydroxyl group. The material provides colored images having improved stability.

Abstract: A heat-sensitive recording material has a substrate and a color-developing layer which comprises a near infrared-absorbing fluorantype leuco dye.This heat-sensitive recording material provides a superior optical readability in near infrared region.

Abstract: A heat-sensitive recording material including a support and a color-developing layer having both an electron donor and a metal double salt or higher fatty acid having 16-35 carbon atoms as an electron acceptor. The heat-sensitive recording material is superior is dispersibility, image contrast, oil resistance, solvent resistance and optical readability in the near infrared region.

Abstract: A pressure-sensitive recording medium producing a colored image utilizing the reaction between a substantially colorless electron donating dye precursor and an electron accepting developer is disclosed. This recording sheet is characterized in that the electron accepting developer layer contains an aromatic carboxylic acid metal salt and the electron donating dye precursor layer contains (a) an indolylazaphthalide compound and (b) Crystal Violet lactone.

Abstract: A heat-sensitive recording material is disclosed. The material is comprised of a support having thereon a heat-sensitive color forming layer comprising at least one electron-donating colorless dye and at least one electron-accepting compound, wherein the electron-donating colorless dye is a fluorene derivative having at least one substituted amino group and the electron-accepting compound has an acid group and a solubility in ethanol of 10 or less at 25.degree. C.The material exhibits improved color developability, improved preservability before recording, improved image stability, and improved chemical resistance.

Abstract: The color-developing sheet for pressure-sensitive recording sheets comprises a color-developing agent containing a phenolic polymer in combination with a polyvalent metal salt of carboxylated terpenephenol resin and/or a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound.This color-developing sheet provides superior plasticizer resistance and less deterioration of a color-developing ability with the lapse of time.

Abstract: The color-developing sheet for pressure-sensitive recording sheet contains a color-developing agent comprising an inorganic solid acid in combination with a polyvalent metal salt of carboxylated terpenephenol resin and/or a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound.This color-developing sheet is superior in both sunlight fading resistance and water resistance.

Abstract: The color-developing sheet for pressure-sensitive recording sheets contains a color-developing agent comprising a polyvalent metal salt of aromatic carboxylic acid in combination with a polyvalent metal salt of carboxylated terpenephenol resin and/or a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound.This color-developing sheet provides a higher color-developing rate and a superior color-developing intensity.

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 corrected 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 pressure-sensitive recording sheet is disclosed. The sheet produces a color image by reaction between a substantially colorless electron donating dye precursor and an electron accepting color developer, wherein a layer containing said electron accepting color developer contains (a) a metal salt of an aromatic carboxylic acid and (b) a zinc salt of dithiocarbamic acid represented by formula (I) ##STR1## wherein R.sub.1 and R.sub.2 each represents an alkyl or aryl group.

Abstract: An improved thermally-responsive record material having improved image retention is disclosed. The invention is an improved thermally-responsive record member, typically a sheet material, bearing a thermally-responsive color-forming composition comprising a chromogenic material, an acidic developer material, and a metal salt of a compound of the formula ##STR1## wherein R.sup.a is selected from --CH.dbd.CH, ##STR2## --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 --, --(CH.sub.2).sub.3 --, --CH.sub.2 --CH.dbd.CH--, and --CH.sub.2 --wherein R.sub.1 is selected from hydrogen, halogen, alkyl, oxyalkyl, or NO.sub.2 with the proviso that the alkyl groups are of 1-5 carbons wherein M is a metal selected from Zn, Ca, Sn, Ni, Cu, Al, Co, and Mg.

Abstract: The color-developing agent for pressure-sensitive recording sheet comprises a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound. The color-developing sheet containing the above color-developing agent provides an excellent color-developing rate and an improved light fastness.

Abstract: A recording material containing the combination of a colorless dye comprising a p-substituted aminophenylindolylphthalide moiety and an electron-accepting compound comprising an organic acid having at least one phenolic hydroxyl group. The dye image obtained by the recording material is stable.

Abstract: In a heat-sensitive recording material comprising on a substrate a recording layer containing a colorless or pale-colored basic dye and an electron accepting reactant material, the heat-sensitive recording material which is characterized in that the basic dye comprises at least one chromeno compound represented by the formula [I] below ##STR1## wherein G and R.sub.1 .about.R.sub.4 are defined in the specification.

Abstract: In a heat-sensitive recording material incorporating a colorless or pale-colored basic dye and a color acceptor which is reactive with the dye to form a color when contacted therewith, the recording material characterized in that (a) as the basic dye are used 100 parts by weight of a specific phthalide derivative of the formula [I] and 20 to 100 parts by weight of a specific black color-forming fluoran derivative of the formula [II], (b) as the color acceptor is used a polyvalent metal salt of an aromatic carboxylic acid and (c) a recording sensitizer is further used, and whereby the resulting record images are at least 0.75 in PCS value at 800 nm.

Abstract: The color-developing agent for pressure-sensitive recording sheet comprises a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound. The color-developing sheet containing the above color-developing agent provides an excellent color-developing rate and an improved light fastness.

Abstract: A recording material containing an electron donating leuco dye and an electron accepting compound, wherein said electron accepting compound is a salicyclic acid derivative having an alkyl group, an alkoxy group or an aryloxy group as a substituent or a metal salt thereof. The recording material has satisfactory color developability, working preservability and stability.

Abstract: The color-developing agent for pressure-sensitive recording sheet comprises the polyvalent-metal salt of carboxylated terpenephenol resin. The color-developing sheet containing the above color-developing agent provides excellent yellowing-resistance, superior color-developing ability and improved fastness of the colored image.

Abstract: The color-developing agent for pressure-sensitive recording sheet comprises the polyvalent-metal salt of carboxylated terpenephenol resin. The color-developing sheet containing the above color-developing agent provides excellent yellowing-resistance, superior color-developing ability and improved fastness of the colored image.

Abstract: Disclosed is a heat-sensitive recording material comprising a base sheet and a heat-sensitive record layer formed over the base sheet and comprising a colorless or pale-colored basic dye and a color developing material capable of forming a color when contacted with the dye, the heat-sensitive recording material being characterized in that the heat-sensitive record layer contains as the color developing material at least one multi-valent metal salt of a halophthalic acid derivative represented by the formula ##STR1## wherein R represents a divalent saturated or unsaturated C.sub.2 -C.sub.12 aliphatic hydrocarbon group which may optionally have a hydroxyl, C.sub.1 -C.sub.3 acyloxy or phenyl group as a substituent or a divalent saturated or unsaturated C.sub.4 -C.sub.6 aliphatic hydrocarbon group containing one or two ether bonds, X is a halogen atom and n is an integer of 1-4.

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: 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: Disclosed is a heat-sensitive recording material comprising a base sheet and a heat-sensitive record layer formed over the base sheet and comprising a colorless or pale-colored basic dye and a color developing material capable of forming a color when contacted with the dye, the heat-sensitive recording material being characterized in that the heat-sensitive record layer contains as the color developing material at least one multi-valent metal salt of an indole-2-carboxylic acid derivative represented by the formula ##STR1## wherein R.sub.1 through R.sub.6 are hydrogen or other substituent. The heat-sensitive recording material is resistant to plasticizer and diazo developer, and also is suitable for high-speed recording.

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 pressure- or heat-sensitive recording material which, in its color reactant system, contains as a color developer for the color former, at least one substituted resorcinol compound of the formula ##STR1## or a corresponding zinc or aluminium salt, in which R is a carboxyl- or aroyl-free substituent which has a positive Hammett para-sigma value and which is capable of forming, together with the adjacent hydroxyl group, an intramolecular hydrogen bond in the form of a six-membered ring.

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: 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.