US3615475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic elements and process for producing vesicular images
Assignee: International Business Machines Corp
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Filing: 1968-03-14
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Granted: 1971-10-26
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Expires: 1988-03-14
Abstract
Abstract A photographic element for producing vesicular images having extended latitudes and low gradations comprising two or more superimposed layers, each comprising a binder material and a photosensitive compound capable of decomposing upon exposure to light to form gas wherein each of said binder materials has a different permeability to gas. A process for producing vesicular images having extended latitudes and low gradations comprising imagewise exposing the above-described photographic elements to light to decompose the photosensitive compounds and heating the element to develop the vesicular images.
Inventors
- 👤 Eugene R Skarvinko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:20
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/60
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
196 words
A photographic vesicular-image-forming element capable of yielding continuous tone vesicular images of extended latitude and low gradation comprising (1) a support coated with (2) a first vesicular-image-yielding layer comprising a photosensitive compound capable of decomposing upon exposure to light to form gas, and a mixture of water-insoluble, synthetic thermoplastic resins as binder material, said material having a low permeability to said gas, and (3) a second vesicular-image-yeilding layer coated on said first layer comprising a photosensitive compound capable of decomposing upon exposure to light to form gas and a mixture of water-insoluble, synthetic thermoplastic resins as binder material which has low permeability to gas different from that of said binder material of said first layer, wherein in each layer the ratio of the amounts of said resins present as the binder material is different such that the permeability to said gas is different in each of said layers, each of said layers providing a vesicular image upon decomposition of said photosensitive compound and development to form said image which corresponds to the varying tone of the original image being reproduced, whereby said original image is reproduced as a lamination of partial images in the said layers.
Claim 2
Dependent Claim
16 words
The element of claim 1 wherein said plurality of superimposed layers are coated on a support.
Claim 3
Dependent Claim
23 words
The element of claim 1 wherein said photosensitive compound is a diazonium compound which decomposes upon exposure to light to form nitrogen gas.
Claim 4
Dependent Claim
13 words
The element of claim 4 wherein said diazonium compound is a p-diazo-dialkylanilIne salt.
Claim 5
Dependent Claim
16 words
The element of claim 1 wherein said diazonium compound is the zinc chloride salt of p-diazo-dimethylaniline.
Claim 6
Dependent Claim
45 words
The element of claim 2 wherein said binder materials have a gas constant within the range of from about 8.6 X 10 16 (cm.3 cm. 2 sec. 1 (cm. Hg./cm.) 1) to about 8 X 10 10 (cm.3 cm. 2 sec. 1 (cm. Hg./cm.) 1).
Claim 7
Dependent Claim
81 words
A photographic vesicular-image-forming element as claimed in claim 1 wherein the binder material of one layer comprises from about 22 percent to about 26 percent of a copolymer of vinylidene chloride and acrylonitrile and from about 8 percent to about 15 percent of polyacrylate, and the binder material of a different layer comprises from about 12 percent to about 15 percent of a copolymer of vinylidene chloride and acrylonitrile and from about 12 percent to about 15 percent of a polyacrylate.
Claim 8
Dependent Claim
65 words
A method of preparing vesicular images having extended latitudes and lower gradations comprising imagewise exposing the element of claim 1 to light to thereby decompose the photosensitive compounds under areas exposed to light, thereby resulting in the production of gas from said photosensitive compounds, and thereafter heating the element to develop a vesicular image from the gas resulting from the decomposition of said photosensitive compounds.
Claim 9
Dependent Claim
65 words
A method of preparing vesicular images having extended latitudes and low gradations comprising imagewise exposing the element of claim 2 to light to thereby decompose the photosensitive compounds under areas exposed to light, thereby resulting in the production of gas from said photosensitive compounds, and thereafter heating the element to develop a vesicular image from the gas resulting from the decomposition of said photosensitive compounds.
Claim 10
Dependent Claim
42 words
A method according to claim 10 including the step of preliminarily heating said element, at a sufficiently low temperature to prevent vesicular image formation, prior to said exposing step to improve the photographic speed and tone reproduction of only said first layer.
Claim 11
Dependent Claim
29 words
A method according to claim 11 wherein said heating step is accomplished by contacting said element with a member selected from the group consisting of hot water and steam.
Claim 12
Dependent Claim
22 words
The element of claim 2 wherein said photosensitive compound is a diazonium compound which decomposes upon exposure to light to form nitrogen.
Claim 13
Dependent Claim
45 words
The element of claim 2 wherein said binder materials have a gas constant within the range of from about 8.6 X 10 16 (cm.3 cm. 2 sec. 1 (cm. Hg./cm.) 1) to about 8 X 10 10 (cm.3 cm. 2 sec. 1 (cm. Hg./cm. 1).
Claim 14
Dependent Claim
106 words
The element of claim 2 wherein said binder material is selected from the group consisting of cellulose acetate, cellulose propionate, ethyl cellulose, polyvinyl chloride, polyvinyl acetate, copolymers of vinyl chloride and vinyl acetate, copolymers of acrylonitrile and vinylidene chloride, copolymers of vinyl chloride and acrylonitrile, copolymers of vinyl chloride and a member selected from the group consisting of methyl acrylate and acrylic acid, copolymers of vinyl acetate and a member selected from the group consisting of diethyl maleate and polyvinyl alcohol, polystyrene, polystyrene-isobutylene, copolymers of styrene, vinylidene fluoride and 1,1-difluoroethylene, polymethyl acrylate, polymethyl methacrylate, polyethyl acrylate, polybutyl methacrylate, polyamides, phenolic resins, polyvinyl pyrrolidone, and mixtures thereof.
Claim 15
Dependent Claim
83 words
A photographic vesicular-image-yielding element as claimed in claim 1, wherein the binder material of said first layer comprises from about 22 percent to about 26 percent of a copolymer of vinylidene chloride and acrylonitrile and from about 8 percent tO about 15 percent of a polyacrylate, and the binder material of said second layer comprises from about 12 percent to about 15 percent of a copolymer of vinylidene chloride and acrylonitrile and from about 12 percent to about 15 percent of a polyacrylate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |