Patent US4594307A successfully refreshed from Google Patents.
US4594307A
Expired / Lapsed
US
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Color thermal diffusion-transfer with leuco dye reducing agent
Assignee: Eastman Kodak Co
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Filing: 1985-04-25
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Granted: 1986-06-10
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Expires: 2005-04-25
Abstract
Abstract A photothermographic composite structure and process for its use provides a color image by thermal diffusion. The photothermographic composite structure comprises: (a) an image-receiving element comprising a polymeric image-receiving layer having a glass transition temperature in the range of 20° to 200° C., and (b) strippably adhered to the image-receiving element, an imageable photothermographic element comprising in at least one layer, thereof a binder, a silver source material, photosensitive silver halide in catalytic proximity to the silver source material, if necessary a reducing agent for silver ion, and a leuco base dye.
Inventors
- 👤 Takuzo Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:40
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/46; G03C8/00; G03C8/40; G03C8/4013
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
84 words
A photothermographic composite structure for use in a solvent-free dye thermal diffusion-transfer process comprising: (a) an image-receiving element comprising a polymeric dyeable image-receiving layer having a glass transition temperature in the range of 20° to 200° C., and (b) strippably adhered to said image-receiving element, an imageable photothermographic element comprising in at least one layer thereof a binder, a silver source material, photosensitive silver halide in catalytic proximity to said silver source material, and a leuco base dye as the sole reducing agent present.
Claim 2
Dependent Claim
84 words
A photothermographic composite structure for use in a solvent-free dye thermal diffusion-transfer process comprising: (a) an image-receiving element comprising a polymeric dyeable image-receiving layer having a glass transition temperature in the range of 20° to 200° C., and (b) strippably adhered to said image-receiving element, an imageable photothermographic element comprising in at least one layer thereof a binder, a silver source material, photosensitive silver halide in catalytic proximity to said silver source material, and a leuco base dye as the sole reducing agent present.
Claim 3
Dependent Claim
15 words
The composite structure according to claim 1 wherein said photothermographic element further comprises a support.
Claim 4
Dependent Claim
15 words
The composite structure according to claim 1 wherein said image-receiving element further comprises a support.
Claim 5
Dependent Claim
17 words
The composite structure according to claim 2 wherein said support is paper, thermoplastic polymer, glass, or metal.
Claim 6
Dependent Claim
17 words
The composite structure according to claim 3 wherein said support is paper, thermoplastic polymer, glass, or metal.
Claim 7
Dependent Claim
38 words
The composite structure according to claim 1 wherein said leuco dye is a biphenol leuco dye, a phenolic leuco dye, an indoaniline leuco dye, an acylated azine leuco dye, a phenoxazine leuco dye, or a phenothiazine leuco dye.
Claim 8
Dependent Claim
26 words
The composite structure according to claim 1 wherein said image-receiving layer comprises a polymeric thermoplastic resin selected from the group consisting of polyesters, cellulosics, and polyolefins.
Claim 9
Dependent Claim
17 words
The composite structure according to claim 7 wherein said resin is a polyvinyl or copolymeric vinyl resin.
Claim 10
Dependent Claim
13 words
The composite structure according to claim 7 wherein said resin is polyvinyl acetate.
Claim 11
Dependent Claim
12 words
The composite structure according to claim 7 wherein said resin is polyvinylchloride.
Claim 12
Dependent Claim
15 words
The composite structure according to claim 7 wherein said resin is a copolymer of vinylchloride-vinylacetate.
Claim 13
Dependent Claim
16 words
The composite structure according to claim 7 wherein said resin is a copolymer of vinylidene chloride-acrylonitrile.
Claim 14
Dependent Claim
15 words
The composite structure according to claim 7 wherein said resin is a copolymer of styrene-acryonitrile.
Claim 15
Dependent Claim
16 words
The composite structure according to claim 1 wherein said photothermographic element further comprises a development modifier.
Claim 16
Dependent Claim
15 words
The composite structure according to claim 5 wherein said support is a polymeric thermoplastic resin.
Claim 17
Dependent Claim
16 words
The composite structure according to claim 1 wherein said photothermographic element further comprises a stripping agent.
Claim 18
Dependent Claim
15 words
The composite structure according to claim 16 wherein said stripping agent is a fluorocarbon compound.
Claim 19
Independent Claim
153 words
A method of providing a color image comprising the steps: (1) providing a photothermographic composite structure comprising: (a) an image-receiving element comprising a dyeable polymeric image-receiving layer having a glass transition temperature in the range of 20° to 200° C., and (b) strippably adhered to said image-receiving element, a photosensitive, photothermographic element comprising in at least one layer thereof a binder, a silver source material, photosensitive silver halide in catalytic proximity to said silver source material, and a leuco base dye as the sole reducing agent present, (2) imagewise exposing said photosensitive element of said photothermographic structure to radiation to provide a latent silver image, (3) developing the exposed composite structure by uniformly heating said structure to form a diffusible dye and allowing it to transfer by diffusion without use of a solvent to said image-receiving layer, (4) dry-stripping said photothermographic element from said image-receiving element to provide a self-supported color image-containing element.
Claim 20
Independent Claim
153 words
A method of providing a color image comprising the steps: (1) providing a photothermographic composite structure comprising: (a) an image-receiving element comprising a dyeable polymeric image-receiving layer having a glass transition temperature in the range of 20° to 200° C., and (b) strippably adhered to said image-receiving element, a photosensitive, photothermographic element comprising in at least one layer thereof a binder, a silver source material, photosensitive silver halide in catalytic proximity to said silver source material, and a leuco base dye as the sole reducing agent present, (2) imagewise exposing said photosensitive element of said photothermographic structure to radiation to provide a latent silver image, (3) developing the exposed composite structure by uniformly heating said structure to form a diffusible dye and allowing it to transfer by diffusion without use of a solvent to said image-receiving layer, (4) dry-stripping said photothermographic element from said image-receiving element to provide a self-supported color image-containing element.
Claim 21
Dependent Claim
20 words
The method according to claim 18 wherein each of said image-receiving and said photothermographic elements independently further comprise a support.
Claim 22
Dependent Claim
17 words
The method according to claim 19 wherein said support is paper, polymeric thermoplastic resin, glass, or metal.
Claim 23
Dependent Claim
18 words
The method according to claim 20 wherein said support for said image-receiving layer is a polymeric thermoplastic resin.
Claim 24
Dependent Claim
15 words
The method according to claim 21 wherein said photothermographic element further comprises a stripping agent.
Claim 25
Dependent Claim
66 words
The method according to claim 18 wherein said step (1) for providing a composite photothermographic structure further comprises the steps of: (a) providing an imageable photothermographic element comprising a photosensitive layer, (b) providing in a separate sheet, a dyeable image-receiving element comprising an image-receiving layer, (c) bringing said photosensitive layer and said image-receiving layer into intimate face-to-face contact so as to provide a composite photothermographic structure.
Claim 26
Dependent Claim
37 words
The method according to claim 18 wherein said heating and transfer step takes place at a temperature in the range of 80° to 250° C. for a time period in the range of 0.5 to 300 seconds.
Claim 27
Dependent Claim
12 words
The method according to claim 18 for providing a colored imaged article.
Claim 28
Dependent Claim
30 words
The method according to claim 18 for providing a multi-colored imaged article wherein two or more of said color imaged receiving layers are superimposed in register on a single substrate.
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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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |