US5283015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing amine-formaldehyde microcapsules and photosensitive microcapsules produced thereby
Assignee: Mead Corp
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Filing: 1991-01-25
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Granted: 1994-02-01
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Expires: 2011-01-25
Abstract
Abstract A process for forming microcapsules having discrete capsule walls comprising the steps of: forming an emulsion of an oily core material phase in a continuous aqueous phase, said oily core material phase including isocyanatoacrylate or cyanoacrylate prewall reactants which react with said aqueous phase to form a pre-wall material around said oily core material phase; and enwrapping particles of said oily core material phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde, and the microcapsules produced thereby are disclosed.
Inventors
- 👤 David A. Hutchings
- 👤 Margaret T. Thomas
- 👤 William A. Hammann, IV
- 👤 Rong-Chang Liang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:06
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; B01J13/185; B01J13/20; B01J13/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
A process for forming microcapsules having discrete capsule walls comprising the steps of: forming an emulsion of an oily core material phase in a continuous aqueous phase, said oily core material phase including an isocyanatoacrylate, or activated acrylate pre-wall reactant which reacts with said aqueous phase to form a pre-wall material around said oily core material phase; and enwrapping particles of said oily core material phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde.
Claim 2
Dependent Claim
81 words
A process for forming microcapsules having discrete capsule walls comprising the steps of: forming an emulsion of an oily core material phase in a continuous aqueous phase, said oily core material phase including an isocyanatoacrylate, or activated acrylate pre-wall reactant which reacts with said aqueous phase to form a pre-wall material around said oily core material phase; and enwrapping particles of said oily core material phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde.
Claim 3
Dependent Claim
11 words
The process according to claim 1 wherein said amine is melamine.
Claim 4
Dependent Claim
11 words
The process according to claim 1 wherein said amine is urea.
Claim 5
Dependent Claim
46 words
The process according to claim 1 wherein said pre-wall reactant is a compound of the formula (VI): ##STR7## wherein R 1 is an alkylene group, an arylene group, an arylenealkylene group, or a polyether group; and wherein m and n independently represent 1, 2 or 3.
Claim 6
Dependent Claim
20 words
The process according to claim 4 wherein said reactant is isocyanatoethylacrylate, isocyanatoethylmethacrylate or a condensate of 2-hydroxyethyl(meth)acrylate with a polyisocyanate.
Claim 7
Dependent Claim
55 words
The process according to claim 1 wherein said oily core material phase further comprises a diisocyanate or polyisocyanate pre-wall reactant in addition to said isocyanatoacrylate pre-wall reactant, said diisocyanate or polyisocyanate pre-wall reactant being capable of reacting with the water of said aqueous phase to form a polyurea network around said oily core material phase.
Claim 8
Dependent Claim
33 words
The process according to claim 6 wherein said oily core material phase or said aqueous phase additionally includes a catalyst for improving the reaction rate between said diisocyanate or polyisocyanate reactant with water.
Claim 9
Dependent Claim
14 words
The process according to claim 7 wherein said catalyst comprises dibutyltin dilaurate or diacetate.
Claim 10
Dependent Claim
17 words
The process according to claim 6 wherein said aqueous phase includes methylated polygalacturonic acid and sulfonated polystyrene.
Claim 11
Dependent Claim
77 words
A process for forming microcapsulates having discrete capsule walls comprising the steps: forming an emulsion of an oily core material phase in a continuous aqueous phase, said oily core material phase including a cyanoacrylate pre-wall reactant which reacts with said aqueous phase to form a pre-wall material around said oily core material phase; and enwrapping particles of said oily core material phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde.
Claim 12
Dependent Claim
77 words
A process for forming microcapsulates having discrete capsule walls comprising the steps: forming an emulsion of an oily core material phase in a continuous aqueous phase, said oily core material phase including a cyanoacrylate pre-wall reactant which reacts with said aqueous phase to form a pre-wall material around said oily core material phase; and enwrapping particles of said oily core material phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde.
Claim 13
Dependent Claim
11 words
The process according to claim 10 wherein said amine is melamine.
Claim 14
Dependent Claim
11 words
The process according to claim 10 wherein said amine is urea.
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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) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |