Title: Preparation of microcapsules

Abstract: Microcapsules are made by (a.) dispersing or dissolving a core substance in a film-forming polymer solution, (b.) emulsifying in fine droplets the resulting dispersion or solution in a vehicle which is poorly miscible with the solvent of the polymer solution and which doesn't dissolve said polymer to prepare an emulsion, and (c.) adding to the emulsion a non-solvent for the polymer wherein the non-solvent is miscible with the solvent, poorly miscible with the vehicle, and does not dissolve the polymer, whereby the solvent is removed by being absorbed by non-solvent emulsion droplets to precipitate the polymer film around the core substance.

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Inventors: Morishita, Masataka (Shizuoka, JA)
Inaba, Yoshihito (Shizuoka, JA)
Fukushima, Mitsuru (Shizuoka, JA)
Kobari, Sadami (Shizuoka, JA)
Nagata, Akiho (Shizuoka, JA)
Abe, Jinnosuke (Shizuoka, JA)

Application Number: 320180
Filing Date: 1973-01-02
Publication_date: 1976-03-09
Assignee: Toyo Jozo Company, Ltd. (JA)
Primary Class(es): 427/213.36 71/64.11, 264/4, 264/4.1, 424/94.3, 424/418, 424/419, 424/494, 424/497, 424/498, 426/302, 427/212, 428/402.2, 428/402.22, 428/402.24
Other Classes:
US Patent Ref:

3173878	Mar, 1965	Reyes	252/316.
3523907	Aug, 1970	Vrancken et al.	252/316.
3576760	Apr, 1971	Gould et al.	424/32.
3669899	Jun, 1972	Vassiliades et al.	252/316.
3714065	Jan, 1973	Kitajima et al.	252/316.
3737337	Jun, 1973	Schnoring et al.	252/316.

Other Refs:
Primary Examiner: Lovering, Richard D.
Assistant Examiner:
Attorney: Craig & Antonelli