US5556583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulation method
Assignee: DIC Corp
•
Filing: 1994-02-02
•
Granted: 1996-09-17
•
Expires: 2014-02-02
Abstract
Abstract An encapsulation method applicable to pharmaceutical preparations, cosmetics, pigment imparting materials such as inks, paints, dyes, electrostatic toner, and others is disclosed, as are methods of use thereof. According to the disclosed method, the use of auxiliary materials such as emulsifiers or surfactants can be dispensed with, and ultramicrocapsules having a readily controllable diameter of 1 mu m and less can be produced. The disclosed method includes the steps of preparing an organic phase consisting of a mixture of one or more hydrophobic liquid and/or solid materials and self dispersible resin which through the action of an aqueous phase, self disperses into particles with a diameter of 0.1 mu m and less; combining an aqueous phase with the organic phase, whereby self emulsification takes place, thereby encapsulating the one or more hydrophobic liquid and/or solid materials.
Inventors
- 👤 Nansei Tashiro
- 👤 Osamu Maruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:35
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0097; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/12; B01J13/125; B41; B41M; B41M5/00; B41M5/124; B41M5/165; G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/09307; G03G9/09392; Y; Y10; Y10S; Y10S260/00; Y10S260/38; Y10S525/00; Y10S525/936; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
An encapsulation method wherein one or more hydrophobic liquid and/or solid materials are encapsulated by a process including the steps of: a) preparing an organic phase consisting of a mixture of: i) self-dispersible resin, selected from the group consisting of vinyl resins and urethane resins, which through the action of an aqueous phase, is self-dispersible into particles with a diameter of up to about 0.1 μm; and ii) said one or more hydrophobic liquid and/or solid materials; and b) combining an aqueous phase with said organic phase, whereby said one or more hydrophobic liquid and/or solid materials become encapsulated by said self-dispersible resin.
Claim 2
Dependent Claim
103 words
An encapsulation method wherein one or more hydrophobic liquid and/or solid materials are encapsulated by a process including the steps of: a) preparing an organic phase consisting of a mixture of: i) self-dispersible resin, selected from the group consisting of vinyl resins and urethane resins, which through the action of an aqueous phase, is self-dispersible into particles with a diameter of up to about 0.1 μm; and ii) said one or more hydrophobic liquid and/or solid materials; and b) combining an aqueous phase with said organic phase, whereby said one or more hydrophobic liquid and/or solid materials become encapsulated by said self-dispersible resin.
Claim 3
Dependent Claim
101 words
An encapsulation method wherein one or more hydrophobic liquid and/or solid materials are encapsulated by a process including the steps of: a) preparing an organic phase consisting of a mixture of: i) self-dispersible resin, selected from the group consisting of vinyl resins and urethane resins, which through the action of an aqueous phase, is self-dispersible into particles with a diameter up to about 0.1 μm; and ii) said one or more hydrophobic liquid and/or solid materials; and b) combining an aqueous phase with said organic phase, whereby self-emulsification takes place, thereby encapsulating said one or more hydrophobic liquid and/or solid materials.
Claim 4
Dependent Claim
101 words
An encapsulation method wherein one or more hydrophobic liquid and/or solid materials are encapsulated by a process including the steps of: a) preparing an organic phase consisting of a mixture of: i) self-dispersible resin, selected from the group consisting of vinyl resins and urethane resins, which through the action of an aqueous phase, is self-dispersible into particles with a diameter up to about 0.1 μm; and ii) said one or more hydrophobic liquid and/or solid materials; and b) combining an aqueous phase with said organic phase, whereby self-emulsification takes place, thereby encapsulating said one or more hydrophobic liquid and/or solid materials.
References Cited (Backward Citations)
US3016308A
Cited
US3544500A
Cited
US3737337A
Cited
US4162165A
Cited
EP0000903A2
Cited
US4228216A
Cited
DE3008658A1
Cited
US4482606A
Cited
EP0064967A1
Cited
US4722838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-17 | 2000-03-18 | 2000-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-17 | 2004-03-18 | 2004-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-17 | 2008-03-18 | 2008-09-17 | $7700.00 | Window Closed / Lapsed |