US4599271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microencapsulation of polyisocyanates by interchange of multiple
Assignee: Moore Business Forms Inc
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Filing: 1984-09-10
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Granted: 1986-07-08
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Expires: 2004-09-10
Abstract
Abstract A method of microencapsulation is disclosed whereby two or more organic-in-aqueous emulsions, each containing a reactive component in the organic phase, are mixed together causing the reactive components to react and form polymeric walls around the organic droplets. Either, neither or both emulsions may contain one or more fill materials in their organic phases.
Inventors
- 👤 Hung-Ya Chao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:18
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/165; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; Y; Y10; Y10S; Y10S521/00; Y10S521/912; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
111 words
A method of making microcapsules having generally continuous polymeric walls comprising the following steps: (a) preparing a first organic-in-aqueous emulsion comprising a first organic solution having a first oil soluble reactive material dissolved therein and a first aqueous emulsification solution, said first oil soluble reactive material being a polyisocyanate; (b) preparing a second organic-in-aqueous emulsion comprising a second organic solution having a second oil soluble reactive material dissolved therein and a second aqueous emulsification solution, said second oil soluble reactive material being an amine; and (c) mixing said organic-in-aqueous emulsions such that said oil soluble reactive materials react to form said microcapsules, said microcapsules encapsulating said first oil soluble reactive material.
Claim 2
Independent Claim
111 words
A method of making microcapsules having generally continuous polymeric walls comprising the following steps: (a) preparing a first organic-in-aqueous emulsion comprising a first organic solution having a first oil soluble reactive material dissolved therein and a first aqueous emulsification solution, said first oil soluble reactive material being a polyisocyanate; (b) preparing a second organic-in-aqueous emulsion comprising a second organic solution having a second oil soluble reactive material dissolved therein and a second aqueous emulsification solution, said second oil soluble reactive material being an amine; and (c) mixing said organic-in-aqueous emulsions such that said oil soluble reactive materials react to form said microcapsules, said microcapsules encapsulating said first oil soluble reactive material.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the microcapsules range in size from 1 to 20 microns.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein each of said aqueous emulsification solutions comprises at least one emulsifier selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, polyethylene glycol, starch, carboxymethylcellulose, and hydroxyethylcellulose.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein said organic-in-aqueous emulsions include a plurality of organic droplets having sizes in the range of 1 to 20 microns.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein said mixing of said organic-in-aqueous emulsions comprises stirring said emulsions for approximately 4 to 24 hours.
Claim 7
Dependent Claim
23 words
The method of claim 5 wherein said organic-in-aqueous emulsions are stirred at a temperature in the range of 20° C. to 80° C.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein said polyisocyanate is present in stoichiometric excess with respect to said amine.
Claim 9
Dependent Claim
111 words
Microcapsules having generally continuous polymeric walls prepared by a method comprising the following steps: (a) preparing a first organic-in-aqueous emulsion comprising a first organic solution having a first oil soluble reactive material dissolved therein and a first aqueous emulsification solution, said first oil soluble reactive material being a polyisocyanate; (b) preparing a second organic-in-aqueous emulsion comprising a second organic solution having a second oil soluble reactive material dissolved therein and a second aqueous emulsification solution, said second oil soluble reactive material being an amine; and (c) mixing said organic-in-aqueous emulsions such that said oil soluble reactive materials react to form said microcapsules, said microcapsules encapsulating said first oil soluble reactive material.
Claim 10
Dependent Claim
111 words
Microcapsules having generally continuous polymeric walls prepared by a method comprising the following steps: (a) preparing a first organic-in-aqueous emulsion comprising a first organic solution having a first oil soluble reactive material dissolved therein and a first aqueous emulsification solution, said first oil soluble reactive material being a polyisocyanate; (b) preparing a second organic-in-aqueous emulsion comprising a second organic solution having a second oil soluble reactive material dissolved therein and a second aqueous emulsification solution, said second oil soluble reactive material being an amine; and (c) mixing said organic-in-aqueous emulsions such that said oil soluble reactive materials react to form said microcapsules, said microcapsules encapsulating said first oil soluble reactive material.
Claim 11
Dependent Claim
16 words
The microcapsules of claim 8 wherein said microcapsules range in size from 1 to 20 microns.
Claim 12
Dependent Claim
32 words
The microcapsules of claim 8 wherein each of said aqueous emulsification solutions comprises at least one emulsifier selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, polyethylene glycol, starch, carboxymethylcellulose, and hydroxyethylcellulose.
Claim 13
Dependent Claim
25 words
The microcapsules of claim 8 wherein said organic-in-aqueous emulsions include a plurality of organic droplets having sizes in the range of 1 to 20 microns.
Claim 14
Dependent Claim
22 words
The microcapsules of claim 8 wherein said mixing of said organic-in-aqueous emulsions comprises stirring said emulsions for approximately 4 to 24 hours.
Claim 15
Dependent Claim
23 words
The microcapsules of claim 12 wherein said organic-in-aqueous emulsions are stirred at a temperature in the range of 20° C. to 80° C.
Claim 16
Dependent Claim
18 words
The microcapsules of claim 8 wherein said polyisocyanate is present in stoichiometric excess with respect to said amine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |