Patent US6620571B2 successfully refreshed from Google Patents.
US6620571B2
Expired / Lapsed
US
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Method for producing microcapsules having improved wall characteristics
Assignee: Eastman Kodak Co
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Filing: 2000-03-17
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Granted: 2003-09-16
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Expires: 2020-03-17
Abstract
Abstract A process for forming microcapsules having substantially impermeable microcapsule walls comprising the steps of: forming an emulsion of an internal phase in a continuous aqueous phase, the internal phase including a photosensitive composition and a polyvalent isocyanate, the continuous aqueous phase including a sulfonated polystyrene, at least one of the internal phase or the continuous aqueous phase further including a hydrophilic polymer; and enwrapping particles of the internal phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde is disclosed.
Inventors
- 👤 Ibrahim Katampe
- 👤 Joseph C. Camillus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:40
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/002; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/10; B01J13/14; B01J13/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
92 words
A process for forming microcapsules having substantially impermeable microcapsule walls comprising the steps of: forming an emulsion of an internal phase in a continuous aqueous phase, said internal phase including a photosensitive composition and a polyvalent isocyanate, said continuous aqueous phase including a sulfonated polystyrene, a polygalacturonic acid and an additional hydrophilic polymer; and enwrapping particles of said internal phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde, whereby said hydrophilic polymer becomes incorporated into said microcapsule walls thereby improving humidity stability of said microcapsules.
Claim 2
Dependent Claim
92 words
A process for forming microcapsules having substantially impermeable microcapsule walls comprising the steps of: forming an emulsion of an internal phase in a continuous aqueous phase, said internal phase including a photosensitive composition and a polyvalent isocyanate, said continuous aqueous phase including a sulfonated polystyrene, a polygalacturonic acid and an additional hydrophilic polymer; and enwrapping particles of said internal phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde, whereby said hydrophilic polymer becomes incorporated into said microcapsule walls thereby improving humidity stability of said microcapsules.
Claim 3
Dependent Claim
12 words
The process according to claim 1 wherein said polygalacturonic acid is pectin.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein said hydrophilic polymer is selected from the group consisting of gelatin, gelatin derivatives, gum arabic, starch, cellulose derivatives and combinations thereof.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein said hydrophilic polymer is gelatin.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said amine is urea or melamine.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein said photosensitive composition is a photopolymerizable composition.
Claim 8
Dependent Claim
14 words
The process of claim 6 wherein said photopolymerizable composition contains an ethylenically unsaturated compound.
Claim 9
Dependent Claim
119 words
Process for forming photosensitive amine-formaldehyde microcapsules having substantially impermeable walls comprising the steps of: emulsifying a photosensitive hydrophobic oil containing a polyvalent isocyanate in a continuous aqueous phase containing a sulfonated polystyrene, a polygalacturonic acid and a hydrophilic polymer selected from the group consisting of gelatine, gum arabic, starch, cellulose and combinations thereof, wherein said polyvalent isocyanate reacts with water of said aqueous phase to form a substantially impermeable pre-wall around droplets of said hydrophobic oil; and enwrapping the pre-wall coated droplets of said hydrophobic oil in an amineformaldehyde condensation product produced by in situ condensation of an amine and formaldehyde, wherein said hydrophilic polymer is incorporated into said microcapsule walls thereby improving the humidity stability of said microcapsules.
Claim 10
Dependent Claim
119 words
Process for forming photosensitive amine-formaldehyde microcapsules having substantially impermeable walls comprising the steps of: emulsifying a photosensitive hydrophobic oil containing a polyvalent isocyanate in a continuous aqueous phase containing a sulfonated polystyrene, a polygalacturonic acid and a hydrophilic polymer selected from the group consisting of gelatine, gum arabic, starch, cellulose and combinations thereof, wherein said polyvalent isocyanate reacts with water of said aqueous phase to form a substantially impermeable pre-wall around droplets of said hydrophobic oil; and enwrapping the pre-wall coated droplets of said hydrophobic oil in an amineformaldehyde condensation product produced by in situ condensation of an amine and formaldehyde, wherein said hydrophilic polymer is incorporated into said microcapsule walls thereby improving the humidity stability of said microcapsules.
Claim 11
Dependent Claim
10 words
The process of claim 8 wherein said amine is melamine.
Claim 12
Dependent Claim
11 words
The process of claim 8 wherein said hydrophilic polymer is gelatin.
Claim 13
Dependent Claim
11 words
The process of claim 8 wherein said polygalacturonic acid is pectin.
Claim 14
Dependent Claim
37 words
The process of claim 8 wherein said photosensitive hydrophobic oil comprises a monomer and said hydrophilic polymer is present in said aqueous phase in an amount of about 0.01 to 10% by weight based on said monomer.
Claim 15
Dependent Claim
29 words
The process of claim 12 wherein said hydrophilic polymer is present in said aqueous phase in an amount of about 0.15 to 3% by weight based on said monomer.
Claim 16
Dependent Claim
11 words
The process of claim 13 wherein said hydrophilic polymer comprises gelatin.
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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) | 2006-09-15 | 2007-03-17 | 2007-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-09-15 | 2011-03-17 | 2011-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-09-15 | 2015-03-17 | 2015-09-16 | $7700.00 | Window Closed / Lapsed |