Abstract:
Disclosed herein is a pressure-sensitive recording material including such a sheet excellent in the durability and definition of the recorded images transcribed on another sheet, which is produced by the process comprising the step of applying the microcapsules encapsulating minute particles of a pigment dispersed in a solution of an adhesive and optionally, an oil-soluble colored dyestuff dissolved in the solvent onto a supporting material such as sheet, and a process for producing the same.
Abstract:
Disclosed herein is a printing material set for preparing bar-code labels by pressure-sensitive printing method comprising (a) a printing tape of a film carrying on the inside surface thereof the microcapsules containing the minute particles of a pigment dispersed in a solution of an adhesive component dissolved in an organic solvent as a core material, and (b) a bar-code label tape comprising bar-code label papers having an adhesive on the undersurface thereof and a stripping tape carrying the bar-code label papers and being removably attached to the adhesive, the printing tape being superposed on the bar-code label tape, the microcapsules facing the uppersurface of the bar-code label tape.
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:
A microcapsule enclosing a color-former solution for a pressure-sensitive recording paper is prepared by a process in which a water-soluble cationic urea resin and at least one of prepolymer selected from the group consisting of melamine-formaldehyde prepolymer, urea-formaldehyde prepolymer and melamine-urea-formaldehyde prepolymer are polycondensed on the surface of a dispersed solvent droplet containing a color-former in the presence of an anionic surfactant, while causing complex-coacervation between the water-soluble cationic urea resin and the anionic surfactant.
Abstract:
Disclosed herein a process for producing a microcapsule having an excellent solvent-resistance and a thermal stability, and an extremely minute amount of unreacted formaldehyde, comprising the steps of dispersing a substance to be encapsulated into an aqueous solution containing a water-soluble cationic urea resin, at least one prepolymer selected from the group consisting of a melamine-formaldehyde prepolymer, a urea-formaldehyde prepolymer and a melamine-urea-formaldehyde prepolymer and an anionic surfactant and then, adding an acid-catalyst into the thus obtained aqueous dispersion thereby forming a wall membrane which encapsulates the dispersed microparticle of the substance to be encapsulated by polycondensing the prepolymer and the cationic urea resin followed by cross-linking while causing complex coacervation, and adding a monosaccharide into the aqueous dispersion while adjusting the pH of the aqueous dispersion with the addition of a hydroxide of an alkaline earth metal thereby removing the unreacted residual formaldehyde remaining in the aqueous dispersion.
Abstract:
Disclosed herein is a process for producing a partially pressure-sensitive recording paper comprising dispersing microcapsules containing a solution of color-former, into a thermally melting suspension medium selected from the group consisting of Japan tallow (haze wax), Carnauba wax, Montan wax, paraffin wax, microcrystalline wax, polyethylene wax, oxidized wax and the mixtures thereof, thereby obtaining an ink comprising the microcapsules and the thermally melting suspension medium, and painting the thus obtained ink on a specified part of a surface of a sheet of paper.
Abstract:
Disclosed herein are a recording paper which is partially pressure-sensitized, comprising microcapsules containing a solution of a colorless color former, sheet material and binder, the microcapsules being fixed to a specified part of a surface of the sheet material via the binder painted on the specified part and majority of the fixed microcapsules having at least a part of the microcapsule exposed to outside of the binder, and a process for producing the recording paper which is partially specified.
Abstract:
Disclosed herein is a microcapsule for pressure-sensitive recording paper, wherein the microcapsule contains a solution of color-former and has a membranous wall of resin formed by the polycondensation of a water-soluble cationic urea resin with either (i) at least two prepolymers selected from the group consisting of melamine-formaldehyde prepolymer, a thiourea-formaldehyde prepolymer and a melamine-thiourea-formaldehyde prepolymer or (ii) a melamine-thiourea-formaldehyde prepolymer.
Abstract:
The invention relates to a process for the preparation of microcapsules of organo-phosphoric acid derivative as capsule core. The derivative has a partial mutual solubility with water. The main feature of the invention is the provision of an inner provisional solid capsule shell of a high molecular hydrophobic substance, such as polymethyl methacrylate. This substance is liable to form a shell on each of the droplets by sedimenting under aqueous condition, while it is capable of dissolving into the capsule core substance, when subject to non-aqueous condition which is established after formation of a permanent outer shell on the provisional shell of each capsule. The provisional shell-forming substance is polymethyl methacrylate, polystyrene, polyvinyl chloride or polyvinyl acetate.
Abstract:
Disclosed herein are a recording paper which is partially pressure-sensitized, comprising microcapsules containing a solution of a colorless color former, sheet material and binder, the microcapsules being fixed to a specified part of a surface of the sheet material via the binder painted on the specified part and majority of the fixed microcapsules having at least a part of the microcapsule exposed to outside of the binder, and a process for producing the recording paper which is partially specified.