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 unsubstituted 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 thermal transfer recording sheet having a heat-sensitive color-forming layer formed on a front side of a substrate and a thermal transfer layer formed on the back side of the substrate and comprising (a) an aromatic isocyanate compound and (b) an imino compound and (c) a low melting point substance such as wax has a white background and excellent image storability. By adding an electron donating colorless dye and an electron-accepting compound to the thermal transfer layer, the transfer density can be improved.

Abstract: A colored image recording material comprising a support and hot-melt inks each comprising at least one coloring material, a photosetting resin and a polmerization initiator and applied on one side of the support can provide colored images excellent in resolving power and image storing properties by an image forming method.

Abstract: There is disclosed a color-image recording material comprising a support and a combination of two or more layers, provided on said support, which contain individually or in combination (a) microcapsules enclosing chiefly a photohardenable resin or microcapsules enclosing chiefly a photohardenable resin and a colorant, (b) a lightproof white material, and (c) a colorant, the layer containing the lightproof white material being provided directly or indirectly on a picture element layer in which two or more picture elements comprising a colorant or microcapsules enclosing chiefly a photohardenable resin and a colorant are arranged in a striped pattern or a mosaic pattern.

Abstract: A compound of the formula: ##STR1## wherein R is a hydrocarbon group, is effective as a color developer in recording materials and particularly excellent in the image stability.

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

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: 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: The present invention relates to a biocapsule comprising a microorganism and useful substances captured by said microorganism and confined therein. This biocapsule has applications such as heat-sensitive recording papers and the like.

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: When, in a heat-sensitive recording material comprising a substrate and a heat-sensitive recording layer provided on the substrate and containing an ordinarily colorless or light-colored dye precursor and a color developer capable of allowing the dye precursor to develop a color by reacting with the dye precursor when heated, the heat-sensitive recording layer further contains 1,2,3-tris(3-butyl-4-hydroxy-6-methylphenyl)butane, the resulting heat-sensitive recording material has excellent sensitivity and image stability.

Abstract: In a thermosensitive recording material comprising a thermosensitive recording layer provided on a support and containing a usually colorless or light-color dye precursor and a color developer which reacts with the dye precursor when heated to effect color development of the dye precursor, the image keeping quality of the recording material can be improved by further containing in the thermosensitive recording layer a compound represented by the general formula: ##STR1## (wherein R.sub.1 and R.sub.2 represent an alkyl group or a halogen).

Abstract: A thermosensitive recording sheet containing in its thermosensitive layer dimethyl 4-hydroxy-phthalate as color developer and further containing if desired dimethyl terephthalate and/or a 2-tert-butylphenol derivative is excellent in color development sensitivity characteristic and recorded image stability.

Abstract: A photosetting microcapsule containing a photosetting resin and a photopolymerization initiator can be controlled in rupture thereof. By utilizing such characteristics of said microcapsule and by using in combination said photosetting microcapsules containing a reactant such as an electron donative compound and the microcapsules containing a co-reactant such as an electron receptive compound capable of forming a colored material by reacting with said reactant or finely powdered co-reactant per se, there is provided a photo- and pressure-sensitive recording sheet which is capable of copying even a positive type original to provide a copy or copies with excellent keeping quality without causing any coloration or discoloration in the portion other than the characters, etc., of the original.

Abstract: A plain paper transfer type pressure-sensitive copying paper comprising a coated paper obtained by adding a surfactant to a coating color comprising a color-forming agent, a color-developing agent capable of reacting with said color-forming agent to yield a colored product and a wax; and coating the color to the surface of a support is free from the self color-formation of coated surface at the time of typing under pressure and is excellent in transferability and color-formability.

Abstract: A pressure-sensitive copying paper of "transfer to plain paper" type obtained by coating a mixture comprising (a) a colorless to light-colored electron-donating color former, (b) a colorless to light-colored electron-accepting color developer giving a colored product by reacting with said color former (a), (c) a wax and (d) a polyvinyl ether, on one side of a support and drying the coated support, provides an advantage which conventional copying papers of "transfer to plain paper" type do not possess, in that the density of a transfer image formed on a plain paper is higher than that of a reverse image formed on the coated side of a copying paper.

Abstract: In heat-sensitive recording sheets containing a colorless to light-colored dye precursor and a color developer which causes said dye precursor to develop a color by reacting with the precursor when heated, image stability can be improved without lowering sensitivities of heat-sensitive recording sheets by using, as a stabilizer, 1,1,3-tris(3-tertiarybutyl-4-hydroxy-6-methylphenyl)butane.

Abstract: A condensate free from stickiness and exhibiting an excellent initial color-formability when used as color developer of pressure sensitive copying paper can be obtained by reacting p-hydroxybenzoic acid and one p-alkyl-substituted phenol or a mixture of two or more p-alkyl-substituted phenols with formaldehyde in the presence of an acid catalyst and then directly taking out the condensate into cold water without any procedure such as dehydration, concentration, etc.

Abstract: Pressure-sensitive copying paper prepared by coating a substrate with a single layer containing a color forming reaction system comprising a metal compound and ligand and further containing a wax can reproduce a clear and fast image onto plain paper.

Abstract: In a pressure sensitive copying paper comprising a color former coated sheet obtainable by coating an aqueous coating color constituted mainly of microcapsules containing a substantially colorless color former and of a protecting agent and a binder, the transferability of the color former onto the color developer coated sheet can be improved by adding a wax to said aqueous coating color in an amount of 3-15% by weight based on the solid content of the coating color.