Abstract: Heat-sensitive recording sheet comprising a base sheet and a color-forming layer including a colorless basic dyestuff and a mono-phenolic 4-hydroxyphenyl compound which is reactive with said dyestuff by heating, wherein said color-forming layer comprises a metal salt of p-alkylbenzoic acid or a metal salt of o-benzoylbenzoic acid (having a particular formula). The sheet provides superior stability against contamination with oily substances while keeping excellent fundamental qualities thereof.

Abstract: It has been found that phthalic acid monoester represented by the general formula: ##STR1## in which R is a saturated alkyl group of 4 to 20 carbon atoms where X is an alkyl group, a halogen or an alkoxy group, is applicable as color-developing agent to prepare heat-sensitive recording sheet with excellent results. It is observed that one of the two carboxylic acid groups of which phthalic acid is composed is esterified with the group mentioned in the claim to form water-insoluble, insublimable compound having melting point of 90.degree. to 130.degree. C. wherein the group introduced controls the acidity of the adjacent carboxylic acid group into a condition suitable for stable and concentrated color-development of colorless dye.

Abstract: A recording sheet for thermal dye-transfer type recording having a coating layer which is placed on a substrate, which is contacted with a coloring material layer containing sublimable dye and on which the sublimable dye is transferred by heating, wherein the coating layer includes an aminoalkyd resin, whereby the recording sheet provides a record with superior color density and causes no heat-adhesion between the recording sheet and a thermal transfer substrate.

Abstract: A recording sheet for thermal-dye transfer type recording having a coating layer which is placed on a substrate which is contacted with a coloring material layer containing sublimable dye and on which the dye is transferred by heating, wherein the coating layer includes both particular fine silica and particular binder, whereby the sheet provides a clear record with superior color density.

Abstract: A color-developing sheet for pressure-sensitive recording sheets having a color-developing layer on the base sheet wherein the color-developing layer includes 3 to 20 parts by weight of zinc carbonate, 1 to 30 parts by weight of thiourea compound and 0.1 to 5 parts by weight of bisphenol per 100 parts by weight of activated clay.

Abstract: Ink jet recording paper comprising on a base sheet with a specific sizing degree a coating layer comprising a water-soluble polymeric binder and particular fine silica particles, wherein the sheet provides a superior aptitude for high speed recording with excellent optical density and improved clear image.

Abstract: Thermal dye-transfer type recording sheet, having a coating layer which is placed on a base sheet, is contacted with a coloring material layer being solid or semisolid state at room temperature and on which a coloring material is transferred selectively by heating, wherein said coating layer comprises at least mixture of saturated polyester and polyvinyl pyrrolidone in a particular ratio. The sheet provides a very clear record with superior light fastness.

Abstract: Pressure-sensitive recording sheets which comprise at least a transfer sheet having on its one side a coating including microcapsules containing as color-former black color-forming fluoran dye and a color-developing sheet having on its one side a color-developer layer containing at least activated clay, zinc carbonate and thiourea compound. The pressure-sensitive recording sheets of this invention provide pure black color image having high-color density, excellent light fastness and less color change with the lapse of time.

Abstract: In preparing microcapsules for carbonless duplicating sheets using aminoaldehyde polycondensate as a capsule wall in a system in which the capsule wall is formed around the hydrophobic material in hydrophilic medium, wherein said hydrophilic medium comprises a combination of an anion-modified polyvinyl alcohol derivative containing sulfo group or sulfonyldioxyd group and an anion-modified water-soluble polymer containing a carboxyl group. The present invention provides a process for producing a high-concentration, low-viscosity microcapsule slurry having advantages such as easy workability, good stability for emulsion, etc.

Abstract: In producing microcapsules using the amino resin as a capsule wall in a system in which hydrophobic core material is dispersed or emulsified in an aqueous acidic solution containing an anionic colloidal substance, said anionic colloidal substance comprises an anionic, water-soluble copolymer consisting of at least three monomers including acrylic acid, hydroxyalkylacrylate or hydroxyalkylmethacrylate and styrenesulfonic acid. The process of the present invention provides a good emulsification against the variation of the emulsifying condition, a good stability of emulsion between the encapsulating reaction, an excellent stability against the variation of the encapsulating conditions and a superior capsule slurry.

Abstract: Ink jet recording sheet comprising more than 1 g/m.sup.2 (as solid content) of water-soluble polymer coated onto the surface of a base sheet comprising uniformly 15-45 wt. parts of synthetic silicate 0.1-1 wt. part of a wet strength additive and 2-10 wt. parts of a particular glass fiber with respect to 100 wt. parts of wood pulp. This ink jet recording sheet provides superior ink absorbency and high recording density without feathering and also has superior stiffness and dimensional stability.

Abstract: A desensitizing ink for pressure sensitive copying sheets using at least a desensitizing agent, pigment and binder, wherein said desensitizing agent comprises at least propylene oxide addition compound selected from compounds of the following formulas: ##STR1## wherein a, b and c represent identical or different integers greater than 1; R is an alkyl group, an alkenyl group, an aryl group, substituted alkyl group, substituted alkenyl group or substituted aryl group; and n is an integer greater than 1. The desensitizing inks of the present invention exhibit sufficient desensitizing effect, excellent yellowing resistance and excellent printability, particularly in wet offset printing.

Abstract: A heat sensitive recording sheet including dimethylterephthalate 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 color developing sheet for pressure-sensitive recording sheet containing in its color developing layer, an organic coreactant (color developing agent), calcium carbonate and styrene-butadiene copolymer latex or modified styrene-butadiene copolymer latex of an average particle size of less than 0.08.mu. whereby a color developing sheet having excellent water resistance, very improved mark formation, improved printability, high surface strength, rapid setting of ink, etc. is provided.

Abstract: A color developing sheet for pressure-sensitive recording sheet containing in its color-developing layer an organic coreactant (color-developing agent), calcium carbonate and acrylamide-modified polyvinylalcohol with this construction the color developing sheet provides very much improved mark formation and improved printability such as high surface strength, rapid ink setting, etc..

Abstract: A heat-sensitive recording sheet containing in its color-forming layer a colorless or pale colored chromogenic fluoran-type dyestuff and p-hydroxybenzoic acid ester having the following general formula ##STR1## wherein R represents ##STR2## This heat-sensitive recording sheet incorporates high image density and very preferable recording aptitude with less abrasiveness and less residues accumulated even for long time recording.Furthermore, a phenol substance having a melting point of more than 90.degree. C. and a solubility of less than 0.1 g per 100 g water, which is used together with said p-hydroxybenzoic acid ester, is useful for lowering the yellowing of the heat-sensitive sheet.

Abstract: Packing material for foodstuff is sterilized with hydrogen peroxide. Residual hydrogen peroxide on the material is then removed by contacting the material with an anti-oxidant or reducing agent which is an approved food additive. L-ascorbic acid is preferred.

Abstract: A color-developing sheet for pressure-sensitive recording sheets, said sheet comprising as a color-developing agent at least one 2,2'-bisphenolsulfone nickel salt selected from compounds of the following formula ##STR1## wherein R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are identical or different, and represent a hydrogen atom, a halogen atom, an alkyl group containing 1 to 10 carbon atoms, a cycloalkyl group containing 3 to 10 carbon atoms, an aralkyl group containing 7 to 11 carbon atoms, or a phenyl group, or a mixture of at least one 2,2'-bisphenolsulfone nickel salt of the above formulae (II) and (III) and at least one 2,2'-bisphenolsulfone zinc salt of the following formula ##STR2## wherein R.sub.1 and R.sub.2 are the same as R.sub.3 through R.sub.8 defined above.

Abstract: A color-developing sheet for pressure-sensitive recording sheets, said sheet comprising as a color-developing agent at least one 2,2'-bisphenolsulfone zinc salt selected from compounds of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are identical or different, and represent a hydrogen atom, a halogen atom, an alkyl group containing 1 to 10 carbon atoms, a cycloalkyl group containing 3 to 10 carbon atoms, an aralkyl group containing 7 to 11 carbon atoms, or a phenyl group.

Abstract: An antibacterial agent comprising one of dicarboxylic compounds or alkali metal salts thereof generally given by the formulaROOC(CH.sub.2).sub.n COOR'wherein R and R' are a hydrogen or an element of the alkali metal group, respectively, and n is an integer ranging from 11 to 14 inclusive, or a mixture of two or more of said compounds or alkali metal salts thereof, said antibacterial agent being stable in an aqueous solution and a small amount of addition thereof to foods exhibiting an improved antibacterial effect on gram-positive bacteria such as Staphylococcus aureus and Bacillus subtilis.