US4386151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion transfer film system with protective layer of copper salt, chitosan and selected polyols
Assignee: Polaroid Corp
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Filing: 1982-07-22
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Granted: 1983-05-31
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Expires: 2002-07-22
Abstract
Abstract A silver diffusion transfer film unit which comprises, in order, a support, a silver precipitating layer, a protective layer comprising chitosan having a copper salt and a polyol selected from the group consisting of glycerol, sorbitol, polyvinyl alcohol, inositol, ethylene glycol, propylene glycol and hydroxyethyl cellulose disposed therein, a release layer, and a photosensitive silver halide layer. In a particularly preferred embodiment, the film unit is an additive color diffusion transfer film unit.
Inventors
- 👤 Michael Berger
- 👤 Charles H. Byers
- 👤 John J. Magenheimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
60 words
A silver diffusion transfer film unit which comprises a support carrying, in order, a layer comprising silver precipitating nuclei; a protective layer comprising a water soluble copper salt, chitosan and a polyol selected from the group consisting of glycerol, sorbitol, polyvinyl alcohol, inositol, ethylene glycol, propylene glycol and hydroxyethyl cellulose; a release layer; and a photosensitive silver halide emulsion layer.
Claim 2
Dependent Claim
60 words
A silver diffusion transfer film unit which comprises a support carrying, in order, a layer comprising silver precipitating nuclei; a protective layer comprising a water soluble copper salt, chitosan and a polyol selected from the group consisting of glycerol, sorbitol, polyvinyl alcohol, inositol, ethylene glycol, propylene glycol and hydroxyethyl cellulose; a release layer; and a photosensitive silver halide emulsion layer.
Claim 3
Dependent Claim
11 words
The film unit of claim 1 wherein said support is transparent.
Claim 4
Dependent Claim
11 words
The film unit of claim 1 wherein said support is opaque.
Claim 5
Dependent Claim
12 words
The film unit of claim 2 which includes an additive color screen.
Claim 6
Dependent Claim
13 words
The film unit of claim 1 wherein said copper salt is copper acetate.
Claim 7
Dependent Claim
46 words
The film unit of claim 1 wherein the copper ion from said copper salt ranges from about 0.1 to 4 mg/ft 2 ; said chitosan ranges from about 1 to 20 mg/ft 2 ; and said polyol ranges from about 0.5 to 10 mg/ft 2 .
Claim 8
Dependent Claim
20 words
The film unit of claim 6 wherein the ratio of chitosan to copper is about 10 to 1, by weight.
Claim 9
Dependent Claim
16 words
The film unit of claim 1 wherein said protective layer is about 2-50 mg/ft 2 .
Claim 10
Dependent Claim
11 words
The film unit of claim 1 wherein said polyol is glycerol.
Claim 11
Dependent Claim
13 words
The film unit of claim 1 wherein said polyol is a polymeric polyol.
Claim 12
Dependent Claim
12 words
The film unit of claim 10 wherein said polyol is polyvinyl alcohol.
Claim 13
Dependent Claim
14 words
The film unit of claim 1 which includes a layer containing an antihalation compound.
Claim 14
Dependent Claim
15 words
The film unit of claim 1 wherein said silver precipitating nuclei are noble metal nuclei.
Claim 15
Dependent Claim
12 words
The film unit of claim 13 wherein said nuclei are palladium nuclei.
Claim 16
Dependent Claim
112 words
A photographic process which comprises the steps of: (a) exposing a film unit which comprises a support carrying, in order, a layer comprising silver precipitating nuclei; a protective layer comprising a water soluble copper salt, chitosan and polyol selected from the group consisting of glycerol, sorbitol, polyvinyl alcohol, inositol, ethylene glycol, propylene glycol and hydroxyethyl cellulose; a release layer; and a photosensitive silver halide emulsion layer; (b) contacting said exposed film unit with a processing composition containing a silver halide developing agent and a silver halide solvent adapted to provide a positive silver image in said layer comprising silver precipitating nuclei; and (c) removing said emulsion layer subsequent to positive image formation.
Claim 17
Dependent Claim
112 words
A photographic process which comprises the steps of: (a) exposing a film unit which comprises a support carrying, in order, a layer comprising silver precipitating nuclei; a protective layer comprising a water soluble copper salt, chitosan and polyol selected from the group consisting of glycerol, sorbitol, polyvinyl alcohol, inositol, ethylene glycol, propylene glycol and hydroxyethyl cellulose; a release layer; and a photosensitive silver halide emulsion layer; (b) contacting said exposed film unit with a processing composition containing a silver halide developing agent and a silver halide solvent adapted to provide a positive silver image in said layer comprising silver precipitating nuclei; and (c) removing said emulsion layer subsequent to positive image formation.
Claim 18
Dependent Claim
10 words
The process of claim 13 wherein said support is transparent.
Claim 19
Dependent Claim
10 words
The process of claim 13 wherein said support is opaque.
Claim 20
Dependent Claim
14 words
The process of claim 16 wherein said film unit includes an additive color screen.
Claim 21
Dependent Claim
12 words
The process of claim 15 wherein said copper salt is copper acetate.
Claim 22
Dependent Claim
15 words
The process of claim 15 wherein said protective layer is about 2-50 mg/ft 2 .
Claim 23
Dependent Claim
45 words
The process of claim 15 wherein the copper ion from said copper salt ranges from about 0.1 to 4 mg/ft 2 ; said chitosan ranges from about 1 to 20 mg/ft 2 ; and said polyol ranges from about 0.5 to 10 mg/ft 2 .
Claim 24
Dependent Claim
20 words
The process of claim 21 where the ratio of chitosan to copper ion is about 10 to 1, by weight.
Claim 25
Dependent Claim
10 words
The process of claim 15 wherein said polyol is glycerol.
Claim 26
Dependent Claim
11 words
The process of claim 15 wherein said polyol is polyvinyl alcohol.
Claim 27
Dependent Claim
16 words
The process of claim 15 wherein said film unit includes a layer containing an antihalation compound.
References Cited (Backward Citations)
US3674482A
Cited
US4056392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |