Abstract: Dihydroheterocyclic amines having a N-hydrocarbyl substitution and a 2-(or 4-) (omega-(nuclearly substituted cyclic)) vinylenyl substitution are described. There compounds are oxidized in an acidic environment to produce styryl dyes.

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.

Abstract: A recording material which is suitable as a pressure-sensitive or heat-sensitive copying paper or recording paper by developing a color in contact with an electron-accepting material which comprises certain fluoran derivatives containing piperidino, pyrrolidino, morpholino and cycohexylamino groups.

Abstract: In a process for hardening microcapsules produced by microencapsulating hydrophobic oil droplets using a complex coacervation process with gelatin as one of the hydrophilic colloids: including the steps of1. emulsifying a water-immiscible oil in an aqueous solution of at least one first hydrophilic colloid ionizable in water and admixing an aqueous solution of at least one second hydrophilic colloid having an electric charge opposite to that of said first colloid,2. causing coacervation of said colloids to occur by adding water thereto or adjusting the pH thereof to form coacervates,3. cooling said coacervates to cause gelling thereof,4. adjusting the pH to alkalinity and adding a hardening agent sequentially or simultaneously,5. increasing the temperature so as to cause hardening, the improvement wherein glyoxal or glutaraldehyde in combination with formaldehyde is present during step (4).

Abstract: A pressure-sensitive recording sheet which comprises a support having thereon a color former-containing microcapsule coating, the microcapsule coating comprising at least two microcapsule layers with the color former concentration in the microcapsules in the microcapsule layer closest to the support being higher than the color former concentration in the microcapsules in the microcapsule layer farther away from the support.

Abstract: This invention provides a novel recording sheet having improved developing ability and resistance to light irradiation and which can be produced easily and economically. A developer layer coated on a support of the recording sheet contains a reacted compound between an alkali metal salt of a phenol resin and a water soluble metallic compound.

Abstract: A method of desensitizing a color developer used in a color forming reaction with a color former comprising contacting a desensitizer composition containing polypropylene glycol having an average molecular weight of about 400 to 5000 with the color developer.

Abstract: A temperature-responsive record material for use in a thermographic recording and reproducing apparatus comprising a supporting sheet carrying a single layer containing, as the temperature-sensitive composition, a mixture resulting by a dispersion of a basic chromogenic compound and of an acidic compound in a binder having as assential binding agent a latex or a mixture of a latex with a non-ionic cellulose ether.

Abstract: In a process for producing microcapsules containing hydrophobic oil drops by complex coacervation including a conventional prehardening treatment in which an aldehyde and an alkali material are added to the system, the improvement which comprises adding gelatin having an isoelectric point lower than that of the gelatin employed for forming the walls of the coacervates to the system at a temperature lower than the gelling point of the gelatin employed for forming the walls of the coacervates, but prior to the simultaneous presence in the system of said aldehyde and alkali material, in an amount sufficient to prevent an increase in viscosity due to the reaction of gelatin and aldehyde during said prehardening step.

Abstract: An improved process for diazo-type multicolor reproduction comprisingA. exposing to light an assembly comprisingI. an original comprising opaque image areas and complementary non-image areas which transmit light,Ii. a photosensitive layer containing at least one photosensitive diazonium salt (c), an azo coupler (b) and a substantially non-thermovolatile acidic substance (d), the acidic substance (d) being present in an amount of at least 5 mols per mol of the diazonium salt (c), andIii.

Abstract: Heat-sensitive recording sheets having an improved stability comprising a colorless or pale-colored chromogenic compound and an organic acid for coloring the chromogenic compound by heating, which are characterized by containing phenol derivatives represented by the formula ##SPC1##Wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hereinafter defined, is disclosed.

Abstract: A 1,3-dihydro-1-oxo-benzo[b]thieno[2,3-C]furan derivative represented by the following General Formula I ##SPC1##or a 1,3-dihydro-3-oxo-benzo[b]thieno[2,3-C]furan derivative represented by the following General Formula II: ##SPC2##wherein ring A represents a benzene ring or a naphthalene ring, R.sub.1 and R.sub.2 each represents an amino group, and X, Y and Z each represents a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkoxy group, an aralkoxy group, an acyloxy group, a nitro group or an amino group, useful as a color former, e.g., in a pressure sensitive copying paper.

Abstract: A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a distinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one lactone compound derived from a pyridine-carboxylic acid represented by the formula ##SPC1##Or a mixture thereof, wherein R.sub.1, R.sub.2, R.sub.3 and the partial structure ##SPC2##Are as defined hereinafter, is disclosed.

Abstract: The pressure sensitive recording sheet is partially desensitized by applying an improved desensitizer to a predetermined area thereof. The improved desensitizer comprises a reaction product produced by the reaction of ammonia, amines, diamines or polyamines with glycidyl esters or glycidyl ethers. The improved desensitizer is hydrophobic and soluble in an oil vehicle.

Abstract: Method of producing microcapsules containing hydrophobic oily liquid, which comprises, in producing microcapsules by complex coacervation, using gelatin, as at least one hydrophilic colloid, adding an aqueous solution of shock preventing agent at a temperature lower than the gelling point of gelatin in order to prevent a rise in viscosity due to reaction of gelatin and aldehyde during hardening pretreatment and rapidly accomplishing hardening pretreatment.