1
Keiso Saeki, Hiroharu Matsukawa: Process for hardening microcapsules containing hydrophobic oil droplets. Fuji Photo Film, Sughrue Rothwell Mion Zinn & Macpeak, May 11, 1976: US03956172 (82 worldwide citation)

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 of


2
Keiso Saeki, Hiroharu Matsukawa, Masato Satomura: Method for preparing microcapsules. Fuji Photo Film, Sughrue Rothwell Mion Zinn and Macpeak, February 17, 1981: US04251386 (72 worldwide citation)

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.


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Keiso Saeki, Fumiaki Shinozaki, Toshiaki Endo: Multicolor recording material. Fuji Photo Film, Sughrue Mion Zinn Macpeak & Seas, October 8, 1991: US05055373 (38 worldwide citation)

A multicolor recording material is disclosed, which comprises a support having provided thereon a coating layer comprising two or more kinds of microcapsules each containing at least a leuco dye capable of being colored by oxidation and a photo oxidizing agent outside said microcapsules, and a reduc ...


5
Shintaro Washizu, Jun Yamaguchi, Fumiaki Shinozaki, Akihiro Shimomura, Toshimasa Usami, Toshiaki Endo, Keiso Saeki: Microcapsule containing photo-oxidizing agent and leuco dye. Fuji Photo Film, Sughrue Mion Zinn Macpeak & Seas, October 9, 1990: US04962009 (28 worldwide citation)

An image-forming material comprising: (a) microcapsules, in which at least one leuco dye capable of developing a color by oxidation and at least one photooxidizing agent (preferably a combination of a lophine dimer and an organic halogeno-compound) are enclosed together, and (b) at least one reducin ...


6
Keiso Saeki, Hiroharu Matsukawa, Masato Satomura: Method for preparing microcapsules. Fuji Photo Film, Sughrue Mion Zinn Macpeak & Seas, October 26, 1982: US04356109 (28 worldwide citation)

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.


7
Keiso Saeki, Hiroharu Matsukawa: Process for hardening microcapsules. Fuji Photo Film, Sughrue Rothwell Mion Zinn & Macpeak, April 5, 1977: US04016098 (23 worldwide citation)

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 compris ...


8
Fujio Kakimi, Yoshiyuki Hoshi, Keiso Saeki: Method of forming microcapsules, microcapsular dispersion, and pressure sensitive recording sheet. Fuji Photo Film, Sughrue Rothwell Mion Zinn and Macpeak, August 26, 1980: US04219604 (20 worldwide citation)

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 carbo ...


9
Hiroharu Matsukawa, Keiso Saeki: Method of forming microcapsule films having low porosity. Fuji Photo Film, Sughrue Rothwell Mion Zinn and Macpeak, December 13, 1977: US04062799 (19 worldwide citation)

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 am ...


10
Hiroharu Matsukawa, Keiso Saeki: Pressure-sensitive recording sheet. Fuji Photo Film, Sughrue Rothwell Mion Zinn & Macpeak, May 4, 1976: US03955026 (16 worldwide citation)

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 ...