US3886085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing fine oil-containing microcapsules having strong protective shells and microcapsules produced thereby
Assignee: Fujifilm Holdings Corp
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Filing: 1972-08-24
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Granted: 1975-05-27
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Expires: 1992-08-24
Abstract
Abstract A process for producing microcapsules of fine oil droplets having strong protective shells by dispersing or emulsifying finely in a polar solvent an oily liquid containing a polyisocyanate adduct having a free isocyanate group and adding to the dispersion or emulsion of the oil droplets a polyamine or a polyamine adduct having a free amino group as a polymerization promotor, whereby the polymerization of the polyisocyanate adduct is caused from the outer side of each oil droplet to encapsulate the oil droplet by the insolubilized polyisocyanate adduct. By this process the size of the microcapsules can be controlled quite easily.
Inventors
- 👤 Masataka Kiritani
- 👤 Hiroharu Matsukawa
- 👤 Akio Watanabe
- 👤 Hitoshi Imamiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:29
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; B41; B41M; B41M5/00; B41M5/124; B41M5/165; Y; Y10; Y10S; Y10S428/00; Y10S428/905; Y10S428/914; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
A PROCESS FOR PRODUCING FINE OIL CONTAINING MICROCAPSULES HAVING STRONG PROTECTIVE SHELLS WHICH COMPRISES DISSOLVING IN AN OILY LIQUID A POLYISOCYANATE ADDUCT HAVING A FREE ISOCYANATE GROUP, SAID ADDUCT HAVING BOTH AN OLEOPHILIC GROUP AND A HYDROPHILIC GROUP, SAID POLYISOCYANATE ADDUCT BEING AN ADDUCT OF HEXAMETHYLENE DIISOCYANATE AND TRIMETHYLOLPROPANE, AN ADDUCT OF TOLYLENEDIISOCYANATE AND TRIMETHYLOLPROPANE, OR A XYLYLENE DIISOCYANATE ADDUCT, DISPRESING OR EMULSIFYING SAID OILY LIQUID CONTAINING SAID POLYISOCYANATE ADDUCT IN A POLAR SOLVENT, ADDING A POLYAMINE OR A POLYAMINE ADDUCT HAVING A FREE AMINO GROUP TO SAID POLAR SOLVENT, AND POLYMERIZING POLYISOCYANATE ADDUCT IN SAID OILY LIQUID.
Claim 2
Dependent Claim
98 words
A PROCESS FOR PRODUCING FINE OIL CONTAINING MICROCAPSULES HAVING STRONG PROTECTIVE SHELLS WHICH COMPRISES DISSOLVING IN AN OILY LIQUID A POLYISOCYANATE ADDUCT HAVING A FREE ISOCYANATE GROUP, SAID ADDUCT HAVING BOTH AN OLEOPHILIC GROUP AND A HYDROPHILIC GROUP, SAID POLYISOCYANATE ADDUCT BEING AN ADDUCT OF HEXAMETHYLENE DIISOCYANATE AND TRIMETHYLOLPROPANE, AN ADDUCT OF TOLYLENEDIISOCYANATE AND TRIMETHYLOLPROPANE, OR A XYLYLENE DIISOCYANATE ADDUCT, DISPRESING OR EMULSIFYING SAID OILY LIQUID CONTAINING SAID POLYISOCYANATE ADDUCT IN A POLAR SOLVENT, ADDING A POLYAMINE OR A POLYAMINE ADDUCT HAVING A FREE AMINO GROUP TO SAID POLAR SOLVENT, AND POLYMERIZING POLYISOCYANATE ADDUCT IN SAID OILY LIQUID.
Claim 3
Dependent Claim
31 words
The process for producing fine oil containing microcapsules having strong protective walls as set forth in claim 1, wherein said polyamine is o-phenylenediamine, m-phenylenediamine, 4,4''-diaminodiphenylmethane, p-phenylenediamine, diaminonaphthalene, 1,3-propylene diamine, or hexamethylenediamine.
Claim 4
Dependent Claim
35 words
The process for producing fine oil containing microcapsules having strong protective walls as set forth in claim 1, wherein said polyamine adduct is an adduct of an aromatic or aliphatic polyamine and an epoxy compound.
Claim 5
Dependent Claim
23 words
The process for producing fine oil containing microcapsules having strong protective walls as set forth in claim 1, where said polyamine is gelatin.
Claim 6
Dependent Claim
24 words
The process for producing fine oil containing microcapsules having strong protective walls as set forth in claim 1, wherein said polar solvent is water.
Claim 7
Dependent Claim
39 words
The process for producing fine oil containing microcapsules having strong protective walls as set forth in claim 1, wherein said polar solvent is ethylene glycol, glycerine, butyl alcohol, or octyl alcohol, or a mixture of water and said alcohol.
Claim 8
Dependent Claim
40 words
The process for producing fine oil containing microcapsules having strong protective walls as set forth in claim 1, wherein the temperature of the capsulation system is raised to polymerize to temperatures lower than the boiling point of the polar solvent.
Claim 9
Dependent Claim
40 words
The process for producing fine oil containing microcapsules having strong protective walls as set forth in claim 1, wherein an additional solvent miscible with said oily liquid and capable of solubilizing said polyisocyanate adduct is added to said oily liquid.
Claim 10
Dependent Claim
38 words
The process for producing fine oil containing microcapsules having strong protective walls as set forth in claim 8, wherein said additional solvent is acetone, methyl ethyl ketone, methyl acetate, ethyl acetate, butyl acetate, tetrahydrofuran, dioxane, dimethylformamide, or diphenylsulPhoxide.
Claim 11
Dependent Claim
12 words
An oily liquid containing microcapsule produced by the process of claim 1.
Claim 12
Dependent Claim
12 words
The composition of claim 10 wherein the oily liquid is a perfume.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |