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US4725527A
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Photosensitive compositions for direct positive color photography
Assignee: SCULLY RICHARD L 1425 SEMINOLE TRAIL SUITE 310 CHARLOTTESVILLE BIRGINIA 22906
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Filing: 1985-12-26
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Granted: 1988-02-16
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Expires: 2005-12-26
Abstract
Abstract The invention relates to a photosensitive composition for direct positive color photography. The photosensitive composition comprises a binder containing a plurality of grains of a semiconductor material, each grain having adsorbed on its surface one of three different complexes of spiropyran with a metal salt, each complex being sensitive to a different wavelength of light, a cross-linkable polymer and a free radical initiator. The photographic composition provides a non-silver photographic process based on the photo-decomposition of the metal-spiropyran complex absorbed on the grains of semiconductor material.
Inventors
- 👤 Jean J. A. Robillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:46
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/46; G03C1/00; G03C1/685; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/105
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
62 words
A direct positive color photosensitive composition comprising a binder containing a plurality of grains of semiconductor each having adsorbed on its surface one of three different photo-bleachable colored complexes of spiropyran with a metal salt, each complex being sensitive to a different wavelength of light of the three primary colors red, blue and green, a crosslinkable polymer, and a free radical initiator.
Claim 2
Dependent Claim
62 words
A direct positive color photosensitive composition comprising a binder containing a plurality of grains of semiconductor each having adsorbed on its surface one of three different photo-bleachable colored complexes of spiropyran with a metal salt, each complex being sensitive to a different wavelength of light of the three primary colors red, blue and green, a crosslinkable polymer, and a free radical initiator.
Claim 3
Dependent Claim
25 words
The photosensitive composition of claim 1, wherein the binder is selected from the group consisting of polyvinyl alcohol, polyvinyl acetate, polyvinylpyrrolidone, carboxyethylcellulose, hydroxyethylcellulose and polyvinylchloride.
Claim 4
Dependent Claim
37 words
The photosensitive composition of claim 1, wherein the semiconductor grains are made of an inorganic semiconductor selected from the group consisting of zinc oxide, tin oxide, titanium dioxide, zirconium oxide, lead oxide, lanthanum oxide and cerium oxide.
Claim 5
Dependent Claim
33 words
The photosensitive composition of claim 1, wherein the semiconductor grains are made of an organic semiconductor of doped aromatic compounds selected from the group consisting of polyvinylcarbazole, polynaphthazarene, pyrazoline polymers, polyazines and polyphenylacetylene.
Claim 6
Dependent Claim
33 words
The photosensitive composition of claim 1, wherein the spiropyran complexes adsorbed on the semiconductor grains are made of spiropyran selected from the group consisting of spirodibenzopyrans, spirodinaphthopyrans, spirobenzonaphthopyrans, 1,3,3 trimethylindolinobenzospiro-pyran and 1,3,3 trimethylindolinonaphthospiropyran.
Claim 7
Dependent Claim
43 words
The photosensitive composition of claim 1, wherein the semiconductor grains are made of an organic semiconductor of coordination metal complexes of polymers selected from the group consisting of Cu(I), Cu(II), Ni(II), and Pd(II) complexes of polyaminoquinone, polyvinyl alcohol, polydithioxamide, polythiocarbamic acid and polyquinoxalophenazine.
Claim 8
Dependent Claim
45 words
The photosensitive composition of claim 1, wherein the spiropyran complexes adsorbed on the semiconductor grains are complexed with metal salts selected from the group consisting of cuprous chloride, zinc chloride, cobaltous chloride, mercurous chloride, antimony chloride, bismuth chloride, barium naphthenate, lead naphthenate and zinc naphthenate.
Claim 9
Dependent Claim
17 words
The photosensitive composition of claim 1 wherein the crosslinkable polymer is an unsaturated polyester dissolved in styrene.
Claim 10
Dependent Claim
26 words
The photosensitive composition of claim 1, wherein the free radical initiator is selected from the group consisting of peroxides, peresters, peracids, benzoin derivatives, azides and diazocompounds.
Claim 11
Dependent Claim
8 words
A spray containing the composition of claim 1.
Claim 12
Dependent Claim
16 words
A photosensitive article comprising a substrate bearing a layer of a composition according to claim 1.
Claim 13
Dependent Claim
43 words
A photographic process, which comprises providing a layer of a composition according to claim 1 on a substrate, exposing the layer to a colored image, and heating the exposed layer to fix the image therein and to destroy the photosensitivity of the layer.
Claim 14
Dependent Claim
58 words
A direct positive color photosensitive article comprising three superimposed layers of a transparent semiconductor material each having adsorbed on its surface a layer of a different one of three photo-decomposable complexes of spiropyran with a metal salt, each complex layer being sensitive to a different wavelength of light and including a crosslinkable polymer and a free radical initiator.
Claim 15
Dependent Claim
58 words
A direct positive color photosensitive article comprising three superimposed layers of a transparent semiconductor material each having adsorbed on its surface a layer of a different one of three photo-decomposable complexes of spiropyran with a metal salt, each complex layer being sensitive to a different wavelength of light and including a crosslinkable polymer and a free radical initiator.
Claim 16
Dependent Claim
50 words
The photosensitive composition of claim 1, wherein a first complex of spiropyran with a metal salt is sensitive to red light, a second complex of spiropyran with a metal salt is sensitive to green light and a third complex of spiropyran with a metal salt is sensitive to blue light.
Claim 17
Dependent Claim
25 words
The photosensitive composition of claim 11, wherein the substrate is selected from the group consisting of transparent film base, paper, walls, billboards, textile and posters.
Claim 18
Dependent Claim
20 words
The photosensitive composition of claim 6, wherein the polymers are granulated in powder form with grains smaller than 10 microns.
Claim 19
Dependent Claim
73 words
The photosensitive composition of claim 1, wherein said spiropyran is a member selected from the group of Formula I-V: ##STR2## wherein R, R 1 , R' 1 , R 2 , R' 2 , R 3 and R' 3 represent hydrogen, an aliphatic group, halogen, nitro, hydroxy, alkoxy, aryloxy, a phenyl group, a substituted phenyl group, piperdyl, an alkylene ester group, an alkylene carboxyl group, a carbamide group or a substituted carbamide group.
Claim 20
Dependent Claim
96 words
A direct positive color photosensitive article, which comprises: a substrate, a first doped organic semiconductor, a bleachable yellow spiropyran and metal salt complex dispersed or dissolved in a binder containing a crosslinkable polymer and additives to promote crosslinking; a second doped organic semiconductor layer, a bleachable magenta spiropyran and metal salt complex dispersed or dissolved in a binder containing a crosslinkable polymer and additives to promote crosslinking, a third doped organic semiconductor layer, a bleachable cyan spiropyran and metal salt complex dispersed or dissolved in a binder containing a crosslinkable polymer and additives to promote crosslinking.
Claim 21
Dependent Claim
96 words
A direct positive color photosensitive article, which comprises: a substrate, a first doped organic semiconductor, a bleachable yellow spiropyran and metal salt complex dispersed or dissolved in a binder containing a crosslinkable polymer and additives to promote crosslinking; a second doped organic semiconductor layer, a bleachable magenta spiropyran and metal salt complex dispersed or dissolved in a binder containing a crosslinkable polymer and additives to promote crosslinking, a third doped organic semiconductor layer, a bleachable cyan spiropyran and metal salt complex dispersed or dissolved in a binder containing a crosslinkable polymer and additives to promote crosslinking.
Claim 22
Dependent Claim
11 words
The photosensitive composition of claim 1, wherein the semiconductor is doped.
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| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
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