US4962010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing amino-formaldehyde microcapsules and photosensitive microcapsules produced thereby
Assignee: Eastman Kodak Co
•
Filing: 1989-06-22
•
Granted: 1990-10-09
•
Expires: 2009-06-22
Abstract
Abstract A method for forming microcapsules by enwrapping an oily core material in a formaldehyde condensation product formed in situ wherein methylated polygalacturonic acid is used in combination with a sulfonated polystyrene as an emulsion stabilizer; the method is particularly useful in forming photosensitive microcapsules in that uniform small microcapsules size is obtained.
Inventors
- 👤 E. Keith Colyer
- 👤 Joseph G. O'Connor
- 👤 W. A. Hammann, IV
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:20
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/002; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2989
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
56 words
A process for forming microcapsules having discrete capsule walls comprising the steps of forming an emulsion of an oily core material in a continuous aqueous phase containing methylated polygalacturonic acid and sulfonated polystyrene and enwrapping particles of said oily core material in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde.
Claim 2
Dependent Claim
56 words
A process for forming microcapsules having discrete capsule walls comprising the steps of forming an emulsion of an oily core material in a continuous aqueous phase containing methylated polygalacturonic acid and sulfonated polystyrene and enwrapping particles of said oily core material in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said amine is urea or melamine.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein said polygalacturonic acid is pectin.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein said formaldehyde condensation product is a melamine-formaldehyde resin.
Claim 6
Dependent Claim
14 words
The process of claim 3 wherein said formaldehyde condensation product is a urea-formaldehyde resin.
Claim 7
Dependent Claim
17 words
The process of claim 3 wherein said pectin exhibits a methylation degree of about 40 to 70%.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein said sulfonated polystyrene is characterized by a sulfonation degree greater than 85%.
Claim 9
Dependent Claim
16 words
The process of claim 7 wherein the sulfonation degree of said polystyrene is greater than 95%.
Claim 10
Dependent Claim
17 words
The process of claim 4 wherein said pectin exhibits a methylation degree of about 40 to 70%.
Claim 11
Dependent Claim
16 words
The process of claim 7 wherein said sulfonated polystyrene exhibits a sulfonation degree greater than 85%.
Claim 12
Dependent Claim
16 words
The process of claim 8 wherein said sulfonated polystyrene has a molecular weight greater than 100,000.
Claim 13
Dependent Claim
16 words
The process of claim 11 wherein said sulfonated polystyrene has a molecular weight greater than 500,000.
Claim 14
Dependent Claim
16 words
The process of claim 12 wherein said sulfonated polystyrene has a sulfonation degree greater than 95%.
Claim 15
Dependent Claim
13 words
The process of claim 1 wherein said core material is a photopolymerizable composition.
Claim 16
Dependent Claim
14 words
The process of claim 14 wherein said photopolymerizable composition contains an ethylenically unsaturated compound.
References Cited (Backward Citations)
US3796669A
Cited
US4001140A
Cited
US4087376A
Cited
US4089802A
Cited
US4228031A
Cited
US4353809A
Cited
US4399209A
Cited
US4440846A
Cited
US4486762A
Cited
US4500624A
Cited
US4608330A
Cited
US4563212A
Cited
US4842978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-08 | 1994-04-09 | 1994-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-08 | 1998-04-09 | 1998-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-08 | 2002-04-09 | 2002-10-09 | $7700.00 | Window Closed / Lapsed |