US5277979A
Expired / Lapsed
US
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Process for microencapsulation
Assignee: Rohm and Haas Co
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Filing: 1992-05-13
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Granted: 1994-01-11
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Expires: 2012-05-13
Abstract
Abstract A process for encapsulating a wide variety of target materials, including both hydrophilic and hydrophobic materials, employs condensation of two reactive compounds to form shells around core phase particles including target material dispersed in a continuous phase. One of the reactive compounds has at least two active methylene functional groups per molecule, the other being an active methylene-reactive crosslinking agent. Either type of the reactive compounds can be dispersed in the continuous phase, the other being dispersible in the core phase. Applications include controlled release microencapsulation of agriculture chemicals and biocides.
Inventors
- 👤 Andrew J. Kielbania, Jr.
- 👤 William D. Emmons
- 👤 George H. Redlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:32
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; A; A01; A01N; A01N25/00; A01N25/26; A01N25/28; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5089; B41; B41M; B41M5/00; B41M5/124; B41M5/165; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
217 words
A coating composition including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising: (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (20 active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 2
Dependent Claim
217 words
A coating composition including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising: (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (20 active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 3
Dependent Claim
216 words
An adhesive including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising: (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 4
Dependent Claim
216 words
An adhesive including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising: (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 5
Dependent Claim
217 words
A mastic composition including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising; (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 6
Dependent Claim
217 words
A mastic composition including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising; (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 7
Dependent Claim
216 words
A caulk including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising; (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 8
Dependent Claim
216 words
A caulk including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising; (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 9
Dependent Claim
217 words
A binder composition including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising; (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 10
Dependent Claim
217 words
A binder composition including core-shell particles containing encapsulated target material within walls of condensation polymer product prepared according to the process comprising: (a) preparing a core emulsion including a core phase of unpolymerized discrete core particles dispersed in said continuous fluid phase by emulsifying in said continuous fluid phase a mixture comprising; (1) a target material, (2) a dispersant for said core particles in said continuous fluid phase; (b) combining with said target material an unpolymerized first reactive compound insoluble in said continuous fluid phase, said first reactive compound being one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; (c) combining with said continuous fluid phase an unpolymerized second reactive compound which is soluble or dispersible in said continuous fluid phase and is one of the compounds selected from the group consisting of (1) compounds having at least two active methylene functional groups per molecule, and; (2) active methylene-reactive crosslinking agents; wherein said second reactive compound is reactive with said first reactive compound; and (d) reacting said first reactive compound with said second reactive compound to form polymeric encapsulating shells around said core particles, said core-shell particles having a diameter on the order of 0.5 micron and less.
Claim 11
Dependent Claim
30 words
A coating composition according to claim 1 wherein the coating composition includes a reactive crosslinkable resin and the target material is selected from crosslinking agents for the reactive crosslinkable resin.
Claim 12
Dependent Claim
28 words
An adhesive according to claim 2 wherein the adhesive includes a reactive crosslinkable resin and the target material is selected from crosslinking agents for the reactive crosslinkable resin.
Claim 13
Dependent Claim
28 words
A mastic according to claim 3 wherein the mastic includes a reactive crosslinkable resin and the target material is selected from crosslinking agents for the reactive crosslinkable resin.
Claim 14
Dependent Claim
28 words
A caulk according to claim 4 wherein the caulk includes a reactive crosslinkable resin and the target material is selected from crosslinking agents for the reactive crosslinkable resin.
Claim 15
Dependent Claim
29 words
A binder composition according to claim 5 wherein the binder includes a reactive crosslinkable resin and the target material is selected from crosslinking agents for the reactive crosslinkable resin.
References Cited (Backward Citations)
GB1091078A
Cited
US3872023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-01-10 | 1997-07-12 | 1998-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-10 | 2001-07-12 | 2002-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-10 | 2005-07-12 | 2006-01-11 | $7700.00 | Window Closed / Lapsed |