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: 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: A pressure-sensitive recording material is described, comprising an electron-donating color former and an electron-accepting color developer wherein said color developer comprises a mixture of (a) an aromatic carboxylic acid metal salt and (b) a hindered phenol as a combined electron-accepting color developer. The aromatic carboxylic acids should desirably have a hydroxyl group in the ortho or para position to the carboxyl group and preferably is a salicylic acid derivative. The hindered phenols preferably have an alkyl substituent in at least one of the 2 and 6 positions. This pressure-sensitive recording material can provide color images having an excellent fastness to light and solvents.

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 desensitizer composition is described, comprising a desensitizer, a 2,2,6,6-tetramethylpiperidine derivative, and additives.

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 process for preparing a color developer sheet for pressure-sensitive recording is disclosed. The sheet is comprised of a coating solution on a support, said coating solution being prepared by dissolving an aromatic carboxylic acid metal salt in an organic solvent and then emulsifying the resulting solution in water. The organic solvent is such that the viscosity of a 50% by weight solution of the aromatic carboxylic acid metal salt in the organic solvent falls within the range of from 200 to 4,000 centipoises. This color developer sheet shows a high color-forming rate and its coated surface is free of irregularity and includes a consistent amount of coating material.

Abstract: A method of preparing a color developer sheet for pressure-sensitive recording is described. The method comprises preparing Coating Solutions A and B separately. Coating Solution A is prepared by dissolving an aromatic carboxylic acid metal salt in an organic solvent and emulsifying the resulting solution in water. Coating Solution B is prepared by mechanically dispersing an aromatic carboxylic acid metal salt in an aqueous system. Coating Solutions A and B are then mixed in such a manner that the weight ratio of the amount of the aromatic carboxylic acid metal salt in Coating Solution A to that of the aromatic carboxylic acid metal salt in Coating Solution B is from 10:90 to 90:10. The resulting mixture is then coated on a support. This color developer sheet shows high developing ability and a high color-forming rate, produces a colored member of high light resistance, and when used as an intermediate sheet, is reduced in the formation of fog.

Abstract: A method for preparing microcapsules comprising polymerizing urea and formaldehyde in the presence of an anionic polyelectrolyte and an ammonium salt of an acid and forming a wall membrane of a urea/formaldehyde resin around droplets of a hydrophobic oily liquid.

Abstract: A method for preparing microcapsules comprising polymerizing urea and formaldehyde in the presence of an anionic polyelectrolyte and an ammonium salt of an acid and forming a wall membrane of a urea/formaldehyde resin around droplets of a hydrophobic oily liquid.

Abstract: A chromenoindole derivative of the following general formula (I): ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents an alkyl group, an alkyl group substituted with one or more of a cyano group, a halogen atom or an alkoxy group, an aralkyl group, a phenyl group or a phenyl group substituted with one or more of an alkyl group or a halogen atom; X represents a hydrogen atom, an alkoxy group, a dialkylamino group, an alkylarylamino group, an alkylaralkylamino group, a diaralkylamino group, an acylamino group, a halogen atom or an alkyl group; Y represents a hydrogen atom, an alkyl group, a halogen atom, an alkoxy group of a nitro group; Z represents an acyl group, or a sulfonyl group; Q.sub.1 and Q.sub.2, which may be the same or different, each represents a hydrogen atom, a lower alkyl group or a halogen atom; and A.sub.1, A.sub.2, A.sub.3 and A.sub.

Abstract: A method of forming microcapsules having high heat resistance and low permeability which comprises the step of forming wall films of urea-formaldehyde resin around individual droplets of a hydrophobic oily solution through the polymerization reaction of urea and formaldehyde in the presence of carboxylated polyvinyl alcohol.

Abstract: A recording material comprising (1) at least one thiazine compound capable of forming a color when contacted with an electron accepting material and represented by the following general formula (I): ##STR1## wherein A.sub.1 and A.sub.2, which may be the same or different, each represents an aryl group or a hetero ring residue or, when taken together, A.sub.1 and A.sub.2 represent a hetero ring or a fluorene ring; ring B represents an aromatic hydrocarbon ring or a hetero ring; and Y represents a hydrogen atom, an alkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group, a hetero ring residue, an amino group, an amido group, a hydroxy group or a thio group; provided that at least one of A.sub.1 and A.sub.2 or, when A.sub.1 and A.sub.2 are taken together, the ring formed by A.sub.1 and A.sub.2, is an electron donating aryl group, an electron donating hetero ring residue or an electron donating fluorene ring residue; and (2) an electron accepting material.

Abstract: A thiazine derivative, which forms a color on contact with an electron accepting material, represented by the formula (II): ##STR1## wherein A.sub.1 and A.sub.2, which may be the same or different, each represents an aryl group or a heterocyclic group and A.sub.1 and A.sub.2 may combine together to form a heterocyclic ring or a fluorene ring, the ring B represents an aromatic hydrocarbon ring or a heterocyclic ring, and Y represents a hydrogen atom, an aliphatic group, an aryl group, a heterocyclic group, an amino group, an amido group, an oxy group or a thio group, but at least one of A.sub.1 and A.sub.2 or the ring formed by the combination of A.sub.1 and A.sub.2 represents an electron donating aryl group or an electron donating heterocyclic group, and a process for preparing the thiazine derivatives represented by the formula (II) by oxidizing a thioamide derivative represented by the formula (I): ##STR2## wherein A.sub.1, A.sub.2, B and Y are as above described.

Abstract: A recording method and material employing a basic color former component which changes to a colored species by an interaction with a cellulose fiber and has a molecular extinction coefficient of not less than about 100 in an ethyl alcohol solution.

Abstract: A method of forming low porosity microcapsule films which comprises chemically or ionically binding a water soluble or water dispersible heterocyclic amine to a microcapsule film forming material, or depositing the heterocyclic amine alone or a water insoluble material formed by reaction with the amine onto the microcapsule film.

Abstract: In a process for producing microcapsules which comprises microencapsulating hydrophobic oil droplets by complex coacervation using at least two hydrophilic colloids having opposite electric charges and being ionizable in water with at least one of the colloids being gellable, the improvement comprising hardening the coacervate wall by the presence of an oxidation product of a polysaccharide as a hardening agent and adjusting the pH.

Abstract: A process for the production of microcapsules comprising bonding chemically or physically a heterocyclic diamine, which is soluble or dispersible in water, to an organic compound in a polar solvent to thereby form a substance, which is insoluble in the polar solvent, and then depositing the substance directly on the surface of particles or droplets of a hydrophobic core material.

Abstract: A process for separating a number of sheets into groups of sheets comprising coating an adhesive composition on an edge of a stack of the sheets fanning the sheets. The adhesive composition contains a naphthalene sulfonic acid-formaldehyde condensation product and a water-soluble polymer material.

Abstract: A pressure-sensitive copying material comprising a support having thereon a microencapsulated color former capable of forming a distinct color when reacted with an electron-accepting solid, the microencapsulated color former comprising at least one benzoxazine derivative represented by the formula (Ia) ##SPC1##, a benzodioxane derivative represented by the formula (Ib) ##SPC2##And a mixture thereof, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and X are as defined hereinafter.