US4842978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of light-sensitive microcapsules containing silver halide and polymerizable compound
Assignee: Fujifilm Holdings Corp
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Filing: 1987-11-12
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Granted: 1989-06-27
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Expires: 2007-11-12
Abstract
Abstract A process for the preparation of light-sensitive microcapsules comprises encapsuling silver halide and a polymerizable compound with a shell comprising an aminoaldehyde resin in an aqueous medium in the presence of an anionic protective colloid, wherein the anionic protective colloid is a mixture of pectin and a polymer comprising a repeating unit derived from styrenesulfonic acid such as poly(styrenesulfonic acid) and a copolymer of an ethylenic unsaturated compound and styrenesulfonic acid.
Inventors
- 👤 Shunichi Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:26
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; G; G03; G03F; G03F7/00; G03F7/002; G03F7/004; G03F7/027; G03F7/028; G03F7/0285; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
A process for the preparation of light-sensitive microcapsules which comprises encapsulating silver halide and an ethylenically unsaturated polymerizable compound with a shell comprising an amino-aldehyde resin in an aqueous medium in the presence of an anionic protective colloid, wherein the anionic protective colloid is a mixture of pectin and a polymer comprising a repeating unit derived from stylenesulfonic acid, and the weight ratio of the pectin to the polymer ranges from 0.1 to 10.
Claim 2
Dependent Claim
74 words
A process for the preparation of light-sensitive microcapsules which comprises encapsulating silver halide and an ethylenically unsaturated polymerizable compound with a shell comprising an amino-aldehyde resin in an aqueous medium in the presence of an anionic protective colloid, wherein the anionic protective colloid is a mixture of pectin and a polymer comprising a repeating unit derived from stylenesulfonic acid, and the weight ratio of the pectin to the polymer ranges from 0.1 to 10.
Claim 3
Dependent Claim
42 words
The process for the preparation as claimed in claim 1, wherein the polymer is a copolymer selected from the group consisting of acrylic acid-styrenesulfonic acid copolymer, maleic anhydride-styrenesulfonic acid copolymer, ethylene-styrenesulfonic acid copolymer, an ethylene deriative-styrenesulfonic acid copolymer and styrenestyrenesulfonic acid copolymer.
Claim 4
Dependent Claim
24 words
The process for the preparation as claimed in claim 1, wherein the polymer has a molecular weight in the range of 10,000 to 1,500,000.
Claim 5
Dependent Claim
22 words
The process for the preparation as claimed in claim 1, wherein the shell of the microcapsules comprises urea resin or melamine resin.
Claim 6
Dependent Claim
20 words
The process for the preparation as claimed in claim 1, wherein a reducing agent is further contained in the microcapsules.
Claim 7
Dependent Claim
22 words
The process for the preparation as claimed in claim 1, wherein a color image forming substance is further contained in the microcapsules.
Claim 8
Dependent Claim
25 words
The process for the preparation as claimed in claim 1, wherein the microcapsules have an average diameter in the range of 0.5 to 50 μm.
Claim 9
Dependent Claim
40 words
The process for the preparation as claimed in claim 1, wherein the anionic protective colloid is used in such amount that the amount of pectin ranges from 1 to 8 weight % based on the amount of the aqueous medium.
Claim 10
Dependent Claim
41 words
The process for the preparation as claimed in claim 1, wherein the anionic protective colloid is used in such amount that the amount of the polymer ranges from 2 to 10 weight % based on the amount of the aqueous medium.
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |