US5283016A
Expired / Lapsed
US
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Method for preparing photosensitive microcapsules
Assignee: Eastman Kodak Co
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Filing: 1989-03-09
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Granted: 1994-02-01
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Expires: 2009-03-09
Abstract
Abstract The present invention is directed to an improved method for forming photosensitive microcapsules and increasing sensitivity by incorporating a thiol into the microcapsules through diffusion while maintaining an aqueous surrounding medium at a pH of 7.0 or less.
Inventors
- 👤 Paul Davis
- 👤 Jacqueline G. Truini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:14
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; B01J13/20; G; G03; G03F; G03F7/00; G03F7/002
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A method for preparing photosensitive microcapsules which comprises the steps of: emulsifying a photosensitive composition in a continuous aqueous phase; forming a wall around the droplets of said photosensitive composition in said aqueous phase and thus producing a capsule slurry; adjusting the pH of said capsule slurry to 7.0 or less; adding a thiol to said capsule slurry before or after adjusting said pH, and retaining said microcapsules in said thiol containing slurry for a period of time sufficient to enable said thiol to diffuse from said slurry into said photosensitive composition.
Claim 2
Independent Claim
92 words
A method for preparing photosensitive microcapsules which comprises the steps of: emulsifying a photosensitive composition in a continuous aqueous phase; forming a wall around the droplets of said photosensitive composition in said aqueous phase and thus producing a capsule slurry; adjusting the pH of said capsule slurry to 7.0 or less; adding a thiol to said capsule slurry before or after adjusting said pH, and retaining said microcapsules in said thiol containing slurry for a period of time sufficient to enable said thiol to diffuse from said slurry into said photosensitive composition.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein said step of forming said wall includes the steps of adding melamine and formaldehyde or a prepolymer thereof to said aqueous phase.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein said continuous aqueous phase contains pectin and sulfonated polystyrene.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein said photosensitive composition is a free radical addition polymerizable composition.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein said free radical addition polymerizable composition contains an ethylenically unsaturated compound.
Claim 7
Dependent Claim
26 words
The method of claim 1 wherein said thiol is added to said aqueous phase in an amount of 0.1 to 5 parts per 100 parts monomer.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein said step of forming said wall includes the steps of adding urea and formaldehyde or a prepolymer thereof to said continuous aqueous phase.
Claim 9
Dependent Claim
66 words
The method of claim 1 wherein said thiol is selected from the group consisting of 6-ethoxy-2-mercaptobenzothiazole, 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, 4-methyl-4H-1,2,4-triazole-3-thiol, 2-mercapto-1-methylimidazole, 2-mercapto-5-methylthio-1,3,4-thiadiazole, 5-n-butylthio-2-mercapto-1,3,4-thiadiazole, 4-methoxybenzenethiol, 1-phenyl-1H-tetrazole-5-thiol, 4-phenyl-4H-1,2,4-triazole-3-thiol, 2-mercaptobenzimidazole, pentaerythritol tetrakis(mercaptoacetate), pentaerythritol tetrakis(3-mercaptoproprionate), trimethylolpropane tris(mercaptoacetate), trimethylolpropane tris(3-mercaptopropionate), 4-acetamidothiophenol, mercaptosuccinic acid, dodecanethiol, 2-mercaptopyridine, 4-mercaptopyridine, 2-mercapto-3H-quinazoline, and 2-mercaptothiazoline, alkylthiophenol, alkoxythiophenol, chlorothiophenol, bromothiophenol, acylthiophenol, dialkylaminothiophenol, trifluoromethylthiophenol, and hydroxythiophenol wherein the number of carbons in the substituent groups ranges from 1 to 20.
Claim 10
Dependent Claim
19 words
The method of claim 8 wherein said thiol is selected from the group consisting of 6-ethoxy-2-mercaptobenzothiazole, 2-mercaptobenzothiazole, and phenylmercaptobenzothiazole.
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| 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 |