US4943449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microcapsules and process for producing them
Assignee: Ohkawara Kokohki Co Ltd
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Filing: 1987-09-01
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Granted: 1990-07-24
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Expires: 2007-09-01
Abstract
Abstract Process for producing microcapsules. Wax or a mixture of wax and protein is dissolved in a mixed solvent consisting of an organic solvent and water, the surfaces of particles of a core substance are wetted with the resulting solution at temperatures of 45 deg.C or below to selectively deposit the wax or the mixture of wax and protein on the particle surfaces and allow them to coat the particle surfaces. And then a slurry containing the particles is subjected to a solvent removal treatment.
Inventors
- 👤 Shizuo Aishima
- 👤 Yoshito Takahashi
- 👤 Masaki Kosemura
- 👤 Masaaki Ohkawara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:25
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5005; A61K9/5015; A61K9/5021; A61K9/5052; A61K9/5089; B; B01; B01J; B01J13/00; B01J13/02; B01J13/04; B01J13/06; B01J13/12; B01J13/125; Y; Y10; Y10S; Y10S426/00; Y10S426/805; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
A process for producing microcapsules which comprises dissolving wax or a mixture of wax and protein in a mixed solvent consisting of 65 to 90% by volume of an organic solvent miscible with water, and water, wetting, with the resulting solution, the surfaces of particles of a core substance at a temperature of 45° C. or below to selectively deposit the wax or the mixture of wax and protein on the surfaces of said particles and coat the surfaces of the particles by forming a slurry of the particles of the core substance in said solution; and then subjecting the slurry containing the particles to a solvent removal treatment.
Claim 2
Dependent Claim
109 words
A process for producing microcapsules which comprises dissolving wax or a mixture of wax and protein in a mixed solvent consisting of 65 to 90% by volume of an organic solvent miscible with water, and water, wetting, with the resulting solution, the surfaces of particles of a core substance at a temperature of 45° C. or below to selectively deposit the wax or the mixture of wax and protein on the surfaces of said particles and coat the surfaces of the particles by forming a slurry of the particles of the core substance in said solution; and then subjecting the slurry containing the particles to a solvent removal treatment.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein the organic solvent is a polar solvent which is miscible with water.
Claim 4
Dependent Claim
19 words
A process according to claim 2, wherein the polar solvent is methanol, ethanol, propanol, acetone or methyl ethyl ketone.
Claim 5
Dependent Claim
23 words
A process according to claim 1, wherein the concentration of the organic solvent in the mixed solvent is at least 75% by volume.
Claim 6
Dependent Claim
15 words
A process according to claim 1, wherein the core substance particles contain a water-soluble substance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |