Abstract: The improved photo-sensitive recording medium carrying the photo-curing microcapsules, capable of minimizing the variation of its "sensitivity" and therefore the image recording speed at the time when the optical image is exposed.A stable "sensitivity", which makes a duplicating operation stable in any environmental conditions, is obtained by fabricating the capsule walls of the photo-curing microcapsules with inorganic substances.

Abstract: An improved process for producing double-capsules by dispersing in a hydrophobic substance a dispersion of microcapsules containing as the core material a hydrophilic substance or a hydrophobic substance, the latter of which is the same as or different from the first named hydrophobic substance, wherein the improvement is characterized in that the first named hydrophobic substance has a viscosity of 40 to 150,000 cps at 25.degree. C.

Abstract: A light-sensitive microcapsule containing silver halide and a polymerizable compound which is enclosed with a shell comprising a polyurea resin and/or polyurethane resin. A light-sensitive material comprising a light-sensitive layer provided on a support wherein the light-sensitive layer contains microcapsules containing silver halide and a polymerizable compound enclosed with a shell comprising an polyurea resin and/or a polyurethane resin and a reducing agent.

Abstract: A recording material comprises a layer which contains a leuco dye on a support. The leuco dye has the formula (I): ##STR1## in which each of R.sup.1 and R.sup.2 independently is an alkyl group, a cycloalky group or an aryl group, or R.sup.1 and R.sup.2 may form, together with the neighboring nitrogen atom, a heterocyclic ring; R.sup.3 is a halogen atom, an alkyl group, an aryl group, an alkoxy group or an aryloxy group; R.sup.4 is an aryl group or a heterocyclic group; R.sup.5 is a halogen atom, an acyloxy group, an acyl group, carbamoyl, sulfamoyl, an alkylsulfonylamino group, an arylsulfonylamino group, an acylamino group, amino, hydroxyl, nitro, cyano, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkysulfonyl group or an arylsulfonyl group; each of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 may have one or more substituent groups; m is 0 or 1; n is 0, 1, 2, 3, 4 or 5; and when n is 2, 3, 4 or 5, the groups represented by R.sup.

Abstract: A pressure-sensitive microcapsule sheet comprising a support having thereon a pressure-sensitive layer comprising microcapsules and a binder comprising a copolymer latex composed of at least two monomers selected from the group consisting of an aliphatic conjugated diolefin monomer, an aromatic vinyl monomer and an ethylenically unsaturated nitrile monomer and an ethylenically unsaturated acid amide monomer. The sheet is free from color stain and fog during printing.

Abstract: An image recording system wherein a capsule sheet carrying thereon a plurality of microcapsules each of which envelopes therein a developing agent pressed onto a sheet-shaped member desirably selected by a user to form a layer of a developing agent on the sheet-shaped member. Thereafter, a second capsule sheet coated with a plurality of microcapsules each of which envelopes therein a dye precursor and whose mechanical strength has been varied in accordance with the image to be recorded is pressed onto the sheet-shaped member with the layer of the developing agent. The microcapsules corresponding to the image to be recorded are ruptured and the dye precursors streamed out thereform react to the developing agent on the sheet-shaped member to develop a visible image thereon.

Abstract: A recording material comprising a support provided thereon a color developer and microcapsules containing a substantially colorless color former is disclosed, wherein the microcapsules further contains at least one of nickel compounds represented by formulae (I) and (II) shown in the specification. The microcapsules exhibit excellent light-resistance, and a color image developed exhibits excellent light-fastness.

Abstract: An improved self-contained record material having tamper resistance through an indicator quality is disclosed. The self-contained record material of the invention is suitable for forming a visible mark with a focussed means of pressure application such as a stylus, needle, or pen and which mark can then later be in part fixed by unfocussed light. The self-contained record material comprises a substrate on which is coated two sets of microcapsules only one of which is made photosensitive to change in viscosity upon exposure to actinic radiation, and the first of which are conventional microcapsules. The color formers in each of the sets of microcapsules are selected to express a different observed color. Original markings, for example, could be black (combination of the orange and blue color formers). After exposure to actinic radiation desensitizing the blue color former containing capsules, subsequent markings are orange indicating the aspect of the subsequence in time.

Abstract: A phenol-formaldehyde color developing resin is used as a partial or complete replacement for the acidic clay color developer hitherto used in loaded self-copying papers for self-adhesive label assemblies. This counteracts desensitization of the backing paper by the adhesives typically used in such assemblies.

Abstract: A pressure-sensitive recording material is disclosed, having microcapsules containing a triphenylmethane leuco-dye dissolved in a solvent composed at least 80% of plant, animal or paraffin oils, the microcapsule walls being formed of a wall material which is water-soluble or water-dispersible before the formation of the microcapsules.

Abstract: The present invention provides a process for forming microcapsules having discrete capsule walls. An emulsion of an oily core material in a continuous aqueous phase containing a polymeric anionic emulsifier, a free radical addition polymerizable cationic monomer and a free-radical initiator is formed. Particles of the oily core material are enwrapped in a polymerizate of the cationic monomer produced by polymerization of the cationic monomer.

Abstract: This invention discloses a manufacturing method of a heat sensitive material having a transparent heat sensitive layer comprised of controlling transparency of heat sensitive layer by coating a composition containing an emulsified dispersion prepared by dispersing a color developer dissolved into an organic solvent slightly soluble or insoluble in water and microcapsules containing at least a colorless or light colored electron donating dye precursor (core material) and then drying the coat, in which a refractive index of the core material and that of an oil phase of the color developer dispersion are properly adjusted. When providing a transparent heat sensitive layer obtained by the above method on a printed support, a printed matter can be seen through the heat sensitive layer.

Abstract: Improved microcapsules contain at least one wall which is the reaction product of at least one isocyanate-reactive group and an aromatic isocyanate which hasthe formula: ##STR1## in which n=8 to 20. The microcapsules are useful in carbonless copy paper.

Abstract: A process for the preparation of light-sensitive microcapsules comprises encapsuling silver halide and a polymerizable compound with a shell comprising an aminoaldehyde resin in an aqueous medium in the presence of an anionic protective colloid, wherein the anionic protective colloid is a mixture of pectin and a polymer comprising a repeating unit derived from styrenesulfonic acid such as poly(styrenesulfonic acid) and a copolymer of an ethylenic unsaturated compound and styrenesulfonic acid.

Abstract: A heat sensitive recording material which comprises a support having thereon a heat sensitive layer containing at least color former-contained microcapsules and a color developer, with the heat sensitive layer being formed using a colorless or light colored precursor of a basic dye as the color former, and according to a process which comprises preparing a coating composition by mixing the color former-contained microcapsules with an emulsified dispersion prepared by dissolving at least the color developer into an organic solvent which is slightly soluble or insoluble in water, and then dispersing the solution in an emulsified condition, coating the resulting composition on the support, and then drying the coat, whereby the heat sensitive layer comes to acquire both excellent transparency and high sensitivity to heat.

Abstract: A process for microencapsulating hydrophobic oils with color reactants, dissolved therein, of color reaction systems by reacting a water-soluble non-ionic melamine/formaldehyde precondensate and a water-soluble polymer in an oil-in-water dispersion for forming the capsule envelope is described. The special feature of this process is that, for stabilizing the oil-in-water dispersion, an aqueous solution of a cationic melamine/formaldehyde precondensate and the aqueous solution of a water-soluble polymer are mixed with vigorous stirring, a solid precipitating as a very fine suspension in the mixture, the mixture thus obtained and containing the very finely suspended solid is mixed with ther oil, containing the color reactant in solution, with vigorous stirring, the oil-in-water dispersion thus obtained in acidified and an aqueous solution of a water-soluble non-ionic melamine/formaldehyde precondensate is added with stirring, in order to form the capsule envelope.

Abstract: A pressure-sensitive recording sheet which forms a colored image by the reaction of an electron donating color former with an electron accepting developer, comprising a support having provided thereon a micro-encapsulated electron donating color former and an electron accepting developer is disclosed, wherein one or more layers containing the microencapsulated electron donating color former contains at least one pigment having a pH of 8.5 or more.

Abstract: Carbonless copy paper is prepared by placing a first sheet of paper coated on one side with a hydrophilic colloid solution in which are dispersed microcapsules of oil droplets containing a colorless electron donor dye into contact with a second sheet of paper coated with an absorbent and an electron accepting color developer compound. The heat resistance and moisture resistance of the copy paper is substantially improved by adding to the hydrophilic colloid solution a graft copolymer having a backbone of carboxymethyl cellulose or gum arabic and side chains of polyacrylic acid or polymethacrylic acid. The image response time of the second sheet can be improved by adding pectin or sulfated starch to the coating.

Abstract: A solvent for chromogenic dye-precursor material for pressure-sensitive recording paper sheet, comprising 50 to 80% by weight of p-monoisopropylbiphenyl and 50 to 20% by weight of hydrogenated terphenyl, and a pressure-sensitive recording paper sheet prepared by using the solvent.

Abstract: Disclosed is a coating composition for producing a high solids content carboxymethylcellulose based "CB" coating for use in pressure sensitive carbonless copy systems. The formulation comprises carboxylmethylcellulose, a wall-forming carboxylated acrylic resin, an organic cross-linker, a polyvalent metal salt, and an oil containing color-forming dye. The composition has a solids content of at least 30% and a viscosity within the range of 50 to 5000 centiposes. The CB paper exhibits the ability to produce improved imaging on computer and dot matrix printers because of better release efficiency and may be manufactured using less energy.

Abstract: This invention discloses a heat sensitive recording material having excellent transparency and anti-scratch property, which comprises on a support a heat sensitive layer and a protective layer successively, in which said heat sensitive layer is prepared by coating a composition containing an emulsified dispersion prepared by dispersing a color developer dissolved into an organic solvent slightly soluble or insoluble in water and microcapsules containing a colorless or light colored electron donating dye precursor and then drying the coat, and said protective layer is comprised of at least a modified polyvinylalcohol with silicon and a colloidal silica; a preferred mixing ratio of the modified polyvinylalcohol with silicon to the colloidal silica is 0.5-3 calculated by parts by weight.

Abstract: A recording material comprises a layer containing a leuco dye provided on a support, characterized in that the leuco dye has the following formula (I): ##STR1## in which each of R.sup.1 and R.sup.2 independently is an alkyl group, an aralkyl group or an aryl group; R.sup.3 is an alkyl group or an aralkyl group; X is ##STR2## and each of R.sup.1, R.sup.2, R.sup.3, X and the benzene rings A, B, C and D may have one or more substituent groups.

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: 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: Disclosed herein are (1) a solvent of a chromogenic dye-precursor material for pressure-sensitive recording paper, which solvent comprises a diarylalkanes containing not less than 80% by weight of a mixture of 1-tolyl-2-phenylpropane and 1,2-ditolylethane, obtained by coupling ethylbenzene and xylene by side-chain dehydrogenation, (2) the pressure-sensitive recording paper sheet prepared by using the solvent and (3) a process for producing the solvent.

Abstract: A heat-sensitive recording material is disclosed. The material comprises a support having provided on the same surface thereof microcapsules containing a basic colorless dye and an organic solvent, and a developer capable of reacting with the basic colorless dye to develop a color, the capsule walls of said microcapsules being impermeable to either of the basic colorless dye and the developer at room temperature but becoming permeable to the colorless dye and/or the developer upon application of heat. The organic solvent is a compound containing at least two benzene rings in the molecule thereof with a total number of at least one hetero atom selected from nitrogen, sulfur, oxygen and phosphorus atoms, if any, being less than 1/10 a total number of carbon atoms of the organic solvent. The material is excellent in preservability before and after recording and is excellent in heat-developability.

Abstract: Disclosed herein is a partially pressure-sensitive recording paper on which an ink has been applied partially, the ink having been prepared by uniformly dispersing microcapsules having a solution of a colorless electron-donating dyestuff as the core material, a thermally melting solid substance and an organic solvent having a mean boiling point of from 250.degree. to 350.degree. C. and a content of aromatic ring carbon of more than 25% while restraining the weight ratio of the solvent to the solid substance and the weight ratio of the solid substance to the microcapsules respectively in a prescribed range.

Abstract: Microcapsules, a process for preparing the same, and a pressure-sensitive recording paper containing the same are disclosed. The microcapsules are prepared by a process which comprises polymerizing melamine and formaldehyde, or polymerizing initial condensates of melamine and formaldehyde, around hydrophobic oil droplets containing a polyisocyanate or a prepolymer of polyisocyanate, wherein a polyhydroxy compound is incorporated into said hydrophobic oil droplets prior to microencapsulation, thereby producing a sturdy double wall made of of polyurethaneurea film (inner wall) and melamine/formaldehyde resin film (outer wall).

Abstract: Disclosed herein are a solvent for a chromogenic dye-precursor material for a pressure-sensitive recording paper sheet, comprising (1) 30 to 80% by weight of p-monoisopropylbiphenyl or a biphenyl mixture of not less than 80% by weight of p-monoisopropylbiphenyl, not more than 20% by weight of m-monoisopropylbiphenyl and not more than 10% by weight of diisopropylbiphenyl, and (2) 70 to 20% by weight of diisopropylnaphthalene or a naphthalene mixture of not less than 97% by weight of diisopropylnaphthalene, not more than 1% by weight of monoisopropylnaphthalene and not more than 2% by weight of triisopropylnaphthalene, and a pressure-sensitive recording paper sheet prepared by using the solvent.

Abstract: A diisopropylnaphthalene mixture containing 50% or more of 2,7-isomer is substantially odorless, has a low viscosity and exhibits a high dissolving power particularly for an electron-donating color former including a black color former. By coating of micro-capsules of an ink comprising the solvent and a color former on a substrate, a carbonless copying paper which is odorless and excellent in color developing speed including that at lower temperatures, can be obtained.

Abstract: There is disclosed a process for the preparation of a pressure-sensitive recording material which contains in its color forming system a color former and a developer therefor, which process comprises using said color former in the amorphous state.When the color former is in this state, it dissolves more readily and the pressure-sensitive recording material so obtained has good color forming properties and enhanced color strength.

Abstract: A heat-sensitive recording material and a recording method are disclosed, wherein the heat-sensitive recording material comprises a support having formed thereon plural heat-coloring elements each comprising a diazo compound and a coupling component capable of causing heat-coloring, the heat-coloring elements coloring in two or more different hues, and the coloring property in each heat-coloring element being capable of being stopped by the action of different radiations, and the recording method comprises first heat-coloring a heat-coloring element of the heat-sensitive recording material, stopping the heat-coloring property of the uncolored portions of the first heat-coloring element by radiation, and then heat-coloring another heat-coloring element; wherein the recording method comprises applying two or more heat-coloring procedures and one or more irradiations of radiation to form recorded images composed of two or more colors on the same sheet.

Abstract: A continuous process for the production of microcapsules having polymeric walls and a solid or liquid core which comprises mixing a polyisocyanate with the material to be encapsulated, reacting the resulting mixture, a polyamine, and an aqueous phase containing a dispersion aid, the reaction being initiated in a high-turbulence mixing zone to form an emulsion, and subsequently transferring the reaction product to a multiple-stage cascade of vessels, the temperature being increased from stage to stage and being kept constant during each stage.

Abstract: A microcapsule-coated sheet for pressure-sensitive copying is disclosed. The microcapsule sheet comprises a base paper having thereon a layer comprising microcapsules and synthetic polymer latex having an oil swelling degree of at least 50% as a binder, and is capable of preventing the occurrence of fog during printing.

Abstract: A microcapsule-containing water-base coating formulation comprises as essential components (a) microcapsules making use of a synthetic resin as a wall-forming material and (b) a reaction product obtained by polymerizing at least one water-soluble vinyl monomer (B) in the presence of a high polymer latex (A) having a glass transition point of 60.degree. C. or lower. The latex (A) and vinyl monomer (B) are used at a solid weight ratio of 3:97-90:10. The water-base coating formulation can provide a microcapsule-coated layer having significantly-improved pressure resistance and frictional stability without need for a stilt. The water-base coating formulation can be applied at a high speed, thereby making a significant improvement to the productivity of carbonless copying and/or recording paper.

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 process for manufacturing microcapsules by dissolving or dispersing microcapsule contents in an aqueous solution of acrylic acid-methacrylic acid copolymer and/or acrylic acid-itaconic acid copolymer, then polymerizing urea and/or melamine and formaldehyde in the solution or dispersion adjusted to pH 2.5.about.6.0, and forming film of urea-formaldehyde copolymer, melamine-formaldehyde copolymer, or urea-melamine-formaldehyde copolymer around capusle contents.Microcapsules manufactured by this process are useful for colors for carbonless paper or thermo-changeable colors.

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: The process for producing microcapsules comprises forming capsules having a wall film composed of an amine-aldehyde polycondensate in a system in which a hydrophobic core substance is dispersed or emulsified in an acid aqueous solution containing an anionic colloidal substance, said anionic colloidal substance being an anionic water-soluble copolymer composed of acrylic acid, styrenesulfonic acid, and alkyl acrylate or alkyl methacrylate. The present invention decreases the large particles present in the capsule slurry, and provides microcapsule which are excellent in emulsification power, emulsification stability, particle size distribution, impermeability of capsule-wall film and workability.

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: A recording sheet is provided having a support with a layer of microcapsules on the surface thereof. The microcapsules contain a substantially colorless electron donating color former and a chlorinated alpha-olefin as a solvent for the color former.

Abstract: A heat-sensitive recording material is disclosed, comprising a support and heat-sensitive recording layer on the support, said layer containing (1) microcapsules containing a basic dye precursor and an organic solvent as the core thereof and (2) a developer capable of forming color on reacting with the basic dye precursor, wherein said microcapsules are produced by the use of a wall-forming substance comprising xylylene diisocyanate or an adduct thereof such that the microcapsule walls are impermeable to both the basic dye precursor and developer at room temperature, but at a temperature of a thermal head during a recording process, become permeable to at least one of the basic dye precursor and developer, thereby permitting formation of a colored image as a result of the reaction between the basic dye precursor and the developer.

Abstract: A variety of materials, e.g., colorants, agricultural chemicals, pharmaceuticals, etc., are conveniently microencapsulated within polyurea skin membranes by interfacial polyaddition, by emulsifying a polyisocyanato hydrophobic liquid in an essentially aqueous medium, said polyisocyanato hydrophobic liquid comprising dissolved material to be microencapsulated, an aliphatic diisocyanate (i) and an isocyanurate ring trimer (ii) of an aliphatic diisocyanate, the ratio by weight of said diisocyanate (i) to said trimer (ii) ranging from 0.05/1 to 0.70/1, and then interfacially reacting a polyamine therewith. The resulting suspension of microcapsules is well adapted, e.g., for the production of carbonless papers.

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: Microcapsules having hard, thick walls are formed by dispersing an oily solution containing a crosslinking agent in an aqueous solution, and forming a polysalt in the aqueous solution, the polysalt including a high molecular weight polyanion and a polycationic polyamine having a functionality of at least three. The polyanion is preferably casein. If the surface of the microcapsules formed in the aqueous solution is lipophilized, the microcapsules easily separate from the solution by filtration. By use of a suitable wetting agent, the filter cake can be used in place of the pigment in any conventional printing ink. The microcapsules may be used in carbonless copy paper technology.

Abstract: A heat-sensitive recording material is disclosed, comprising a support having provided thereon a heat-sensitive recording layer containing microcapsules containing a color former and an organic solvent as core materials and a color developer exterior thereto, the wall of said microcapsules being impermeable to both of the color former and the color developer at room temperature but becoming permeable to at least one of the color former and color developer upon the application of heat, wherein the heat-sensitive recording layer further contains a pigment having an average particle size greater than that of the microcapsules. The material exhibits improved handling and running properties.

Abstract: A stable emulsion of microcapsules is obtained by polymerizing at least one water-soluble vinyl monomer in an aqueous solution of an oil-soluble vinyl monomer-maleic anhydride-maleic ester multipolymer to prepare a water-soluble resin, dispersing or emulsifying discrete fine particles of a hydrophobic material in an acidic aqueous solution of the water-soluble resin, adding an amino resin precursor separately prepared to the dispersion or emulsion, and heating the mixture.

Abstract: Disclosed is a pressure sensitive manifold paper prepared by coating a substrate with a coating composition containing microcapsules of polyurethane resin or polyurea resin wall film and drying the resulting coating, the pressure sensitive manifold paper being characterized in that a latex of copolymer of comonomers comprising about 10 to about 50% by weight of styrene, about 15 to about 55% by weight of butadiene, about 10 to about 40% by weight of methyl methacrylate and up to about 15% by weight of acrylonitrile is incorporated in the coating composition in an amount of about 5 to about 30% by weight (calculated as solids) based on the microcapsules (calculated as solids).The pressure sensitive manifold paper has an adequate balance between the color forming ability and susceptibility to color smudges due to contact or friction.

Abstract: A pressure-sensitive recording paper comprising a support having coated thereon a layer of color former, said color former dissolved in at least one compound represented by the following formula: ##STR1## wherein n is an integer of 1 to 8, R and R' each represent a member selected from the group consisting of alkyl groups containing one to eight carbon atoms, and a hydrogen atom, p and q represent the number of alkyl groups, p+q being an integer of 1 to 3, and R and R' may be the same.