Fuji Photo Film Company, Limited

Yoshiyuki Hoshi

Hiroharu Matsukawa

Fujio Kakimi

Takayuki Hayashi

Yosuke Nakajima

Keiso Saeki

Naoyoshi Chino

Shinzo Kishimoto

Noriyuki Hosoi

Hirofumi Mitsuo

Akira Ushimaru

Yoshio Seoka

Masayoshi Kawai

Takayoshi Fukuoka

Kazunori Hasebee

A thermosensitive recording material which comprises a support having a low Streckigt sizing degree, an undercoat layer comprising an oil absorbable pigment and a carboxymethyl cellulose, and a thermosensitive recording layer coated on the undercoat layer. The thermosensitive recording material of this invention can be used in a high speed recording system, since it has a high sensitivity, a high image quality and a low capacity to adhere stain to a thermal head, and these advantages can be improved further by adding an appropriate amount of paraffin wax to the undercoat layer. The thermosensitive recording material can be produced economically because a low cost material having a low Steckigt degree can be used as the support.

Thermosensitive recording material

A microcapsule sheet is disclosed. At least one surface of the base paper has a coating produced from a solution that contains microcapsules each containing an electron donating color former, a binder whose solid content is from 20 to 50 parts by weight based on 100 parts by weight of the solid content of the microcapsules, a protective agent and a surfactant having a hydrophobic atomic group of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each an aliphatic hydrocarbon having 2 to 20 carbon atoms or aromatic hydrocarbon having 6 to 20 carbon atoms.

Microcapsule sheet for pressure-sensitive recording paper

A process for producing microcapsules comprising forming capsule membranes of a polymer of melamine and formaldehyde in the presence of a styrene-sulfonic acid polymer.

Process for producing microcapsules

Microcapsules with a melamine-formaldehyde or urea-formaldehyde resin capsule shell are produced by adding in advance a polyvalent isocyanate, a polyvalent isothiocyanate or a prepolymer thereof to the hydrophobic oily liquid to be encapsulated, emulsifying the hydrophobic oily liquid in an aqueous solution of a water-soluble polymer, adding an aqueous solution of melamine and formaldehyde or a precondensate thereof or urea and formaldehyde to the emulsion, and polymerizing the melamine and formaldehyde or a precondensate thereof or the urea and formaldehyde.

Process for the production of microcapsules

A method of preparing a dispersion of microcapsules whose walls comprise formaldehyde as one of the wall components characterized by adding urea, a sulfite or a hydrogensulfite to said dispersion.

Method of preparing a microcapsule dispersion

A process for forming color images which comprises image-wise exposing a silver halide photographic material, subjecting the exposed photographic material to color development and then fixing the developed material with a fixing bath having a pH of at least 6, the process being free from a silver bleaching (elimination) step. The process is especially suitable for application to radiographic materials.

Process for forming color images

A capsule solution is prepared by polymerizing urea and formaldehyde in the presence of gum arabic to thereby form a urea-formaldehyde resin wall around a hydrophobic oily solution. The use of gum arabic reduces the viscosity of the capsule solution, the capsule solution which is obtained is particularly suitable for preparing pressure sensitive recording sheets.

Process for preparing microcapsules by polymerization of urea and

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.

Method of forming microcapsules, microcapsular dispersion, and pressure

A method of recording a radiation image having excellent sharpness which comprises

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Fujinomiya, Japan

Yoshiyuki Hoshi