Patent US3714065A successfully refreshed from Google Patents.
US3714065A
Expired / Lapsed
US
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Process for preparing a micro capsule
Assignee: Fujifilm Holdings Corp
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Filing: 1971-02-03
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Granted: 1973-01-30
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Expires: 1991-02-03
Abstract
Abstract A process for preparing microcapsules which comprises; dissolving a film-forming polymer in an organic solvent to form a solution, said solvent having a dielectric constant between 10 and 40 and a poor compatibility with liquid paraffins and silicone oils; dispersing a core substance in the solution, to form a first dispersion; dispersing said first dispersion in an encapsulating medium comprising a liquid paraffin or a silicone oil in the form of fine droplets; and evaporating the solvent and the encapsulating medium from the dispersion.
Inventors
- 👤 M Kitajima
- 👤 A Kondo
- 👤 M Morishita
- 👤 J Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:24
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/12; B01J13/125; A; A61; A61K; A61K9/00; A61K9/14; A61K9/16; A61K9/1682; A61K9/1694; G; G03; G03C; G03C5/00; G03C5/26; G03C5/261; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
99 words
A process for preparing microcapsules which comprises; dissolving a film-forming polymer which forms a protective microcapsule wall on the core material in an organic solvent to form a solution, said solvent having a dielectric constant between 10 and 40 and a poor compatibility with liquid paraffins and silicone oils; dispersing a core substance in the solution to form a first dispersion; dispersing said first dispersion in an encapsulating medium comprising a liquid paraffin or a silicone oil in the form of fine droplets; and evaporating the solvent and the encapsulating medium from the dispersion whereby said microcapsules are formed.
Claim 2
Dependent Claim
99 words
A process for preparing microcapsules which comprises; dissolving a film-forming polymer which forms a protective microcapsule wall on the core material in an organic solvent to form a solution, said solvent having a dielectric constant between 10 and 40 and a poor compatibility with liquid paraffins and silicone oils; dispersing a core substance in the solution to form a first dispersion; dispersing said first dispersion in an encapsulating medium comprising a liquid paraffin or a silicone oil in the form of fine droplets; and evaporating the solvent and the encapsulating medium from the dispersion whereby said microcapsules are formed.
Claim 3
Dependent Claim
35 words
The process as claimed in claim 1 wherein said solvent is methanol, ethanol, isopropanol, butanol, benzyl alcohol, ethylene glycol, propylene glycol, phenol, acetone, acetic acid, acetic anhydride, nitromethane, ethyl-enediamine, acetic acid Cellosolve or mixtures thereof.
Claim 4
Dependent Claim
59 words
The process as claimed in claim 1 wherein said polymer is cellulose acetate phthalate, an acrylic acid/acrylic acid ester copolymer, shellac, cellulose acetate-N, N-di-n-butylhydroxypropyl ether, a 2-methyl-5-vinyl-pyridine/methyl acrylate/methacrylic acid copolymer, polyvinyl pyrrolidone, polyvinyl alcohol, a vinylmethylether/maleic anhydride copolymer, a methyl-methacrylate/maleic anhydride copolymer, a styrene/maleic anhydride copolymer, a methyl methacrylate/methacrylic acid copolymer or a complex of gelatin and alkyl sulfate.
Claim 5
Dependent Claim
21 words
The process as claimed in claim 1 wherein the dielectric constant of said solvent varies from about 15 to about 35.
Claim 6
Dependent Claim
19 words
The process as claimed in claim 1 wherein said fine droplets vary in size from 0.5 to 1.5 mm.
Claim 7
Dependent Claim
31 words
The process as claimed in claim 1 wherein from 1/5 to 10 parts by weight of said film-forming polymer are employed to each 1 part by weight of said core substance.
Claim 8
Dependent Claim
27 words
The process as claimed in claim 1 wherein the encapsulating medium is employed in an amount of four to 15 times by weight of the first dispersion.
Claim 9
Dependent Claim
14 words
The process as claimed in claim 1 wherein said core substance is an enzyme.
Claim 10
Dependent Claim
19 words
The process as claimed in claim 1 wherein said core substance is a solid powder insoluble in said solvent.
Claim 11
Dependent Claim
20 words
The process as claimed in claim 1 wherein said microcapsules have a diameter of from 50 microns to 5 millimeters.
Claim 12
Dependent Claim
22 words
The process as claimed in claim 1 wherein said silicone oil is methyl silicone oil, phenyl silicone oil or methylphenyl silicone oil.
Claim 13
Dependent Claim
23 words
The process as claimed in claim 1 wherein said silicone oil has a viscosity at 25* C of from 50 to 500 cp.
Claim 14
Dependent Claim
22 words
The process as claimed in claim 1, wherein said film-forming polymer is a resinous polymer which is insoluble in the encapsulating medium.
Claim 15
Dependent Claim
17 words
The process of claim 1, wherein said solvent is substantially immiscible with liquid paraffins and silicone oils.
Claim 16
Dependent Claim
14 words
The process of claim 1, wherein the core substance is insoluble in the solvent.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |