US3984253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imaging processes and elements therefor
Assignee: Eastman Kodak Co
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Filing: 1974-04-22
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Granted: 1976-10-05
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Expires: 1994-04-22
Abstract
Abstract A radiation-sensitive element comprises a support having thereon a composition comprising a depolymerizable polymer, such as a polymer of an aromatic 1,2-dialdehyde, and may also contain a radiation-sensitive substance or combination of substances, binder and/or a color-forming substance or combination of substances. A negative-working radiation-sensitive process comprises exposing a radiation-sensitive element to radiation, following which the element is heated in order to accelerate the depolymerization reaction. A visible image can be formed during heating by the reaction of the released monomer, such as an aromatic 1,2-dialdehyde, with a color-forming substance included in the element or contained in a separate element, or by heat treatment in the presence of a gaseous color-forming reagent. A positive-working radiation-sensitive process comprises exposing a radiation-sensitive element to radiation following which the element is heated or contacted with a solvent which removes the exposed areas but permits the unexposed areas to remain as a positive resist.
Inventors
- 👤 Roger W. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:45
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/039; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/126
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
41 words
A radiation-sensitive element comprising a thin film of a depolymerizable polymer of an aromatic 1,2-dialdehyde, said polymer having hydroxyl or polystyrene endcaps and a sensitizer capable, upon absorption of radiation, of producing products capable of initiating the depolymerization of said polymer.
Claim 2
Dependent Claim
41 words
A radiation-sensitive element comprising a thin film of a depolymerizable polymer of an aromatic 1,2-dialdehyde, said polymer having hydroxyl or polystyrene endcaps and a sensitizer capable, upon absorption of radiation, of producing products capable of initiating the depolymerization of said polymer.
Claim 3
Dependent Claim
19 words
An element of claim 1 in which said film has a thickness of about 0.01 to about 1000 micrometers.
Claim 4
Dependent Claim
12 words
An element of claim 1 in which said polymer is a polyphthalaldehyde.
Claim 5
Dependent Claim
12 words
An element of claim 1 in which said polymer is a polynaphthalenedicarboxaldehyde.
Claim 6
Dependent Claim
16 words
An element of claim 1 in which said sensitizer liberates an acid upon exposure to radiation.
Claim 7
Dependent Claim
21 words
An element of claim 1 in which said sensitizer is a halogenated compound which liberates an acid upon exposure to radiation.
Claim 8
Dependent Claim
15 words
An element of claim 1 in which said sensitizer is sensitive to ultra violet radiation.
Claim 9
Dependent Claim
15 words
An element of claim 1 in which said sensitizer is sensitive to electron beam radiation.
Claim 10
Dependent Claim
25 words
An element of claim 1 in which said sensitizer is selected from the class consisting of tetrabromoethane, carbon tetrabromide, pentabromoethane, tribromoacetophenone dibromoethylbenzene and p-nitrobenzal bromide.
Claim 11
Dependent Claim
11 words
An element of claim 1 in which said sensitizer is α,α-dibromo-p-nitrotoluene.
Claim 12
Dependent Claim
17 words
An element of claim 1 in which said sensitizer is a mixture of tetrabromoethane, triphenylmethane and diphenylamine.
Claim 13
Dependent Claim
10 words
An element of claim 1 which also contains a binder.
Claim 14
Dependent Claim
13 words
An element of claim 12 in which said binder is a polyester resin.
Claim 15
Dependent Claim
14 words
A photographic element of claim 1 in which said support is a flexible support.
Claim 16
Dependent Claim
12 words
An element of claim 1 in which said support is a polyester.
Claim 17
Dependent Claim
30 words
A process of producing an image by imagewise depolymerization comprising imagewise exposing to radiation a coating comprising a polymer of an aromatic 1,2-dialdehyde, said polymer having hydroxyl or polystyrene endcaps.
Claim 18
Dependent Claim
30 words
A process of producing an image by imagewise depolymerization comprising imagewise exposing to radiation a coating comprising a polymer of an aromatic 1,2-dialdehyde, said polymer having hydroxyl or polystyrene endcaps.
Claim 19
Dependent Claim
15 words
A process of claim 16 in which said polymer is exposed to an electron beam.
Claim 20
Dependent Claim
12 words
A process of claim 16 in which said polymer is a polyphthalaldehyde.
Claim 21
Dependent Claim
12 words
A process of claim 16 in which said polymer is a polynaphthalenedicarboxaldehyde.
Claim 22
Dependent Claim
26 words
A process of claim 16 in which an amine or ammonia is contacted with the exposed coating at a temperature of about 90 to about 150°C.
Claim 23
Dependent Claim
53 words
A process of producing an image by imagewise depolymerization comprising imagewise exposing a coating comprising a polymer of an aromatic 1,2-dialdehyde, said polymer having hydroxyl or polystyrene endcaps and a sensitizer capable, upon absorption of radiation, of yielding an acidic product, and heating said composition to about 90° C to about 150° C.
Claim 24
Dependent Claim
53 words
A process of producing an image by imagewise depolymerization comprising imagewise exposing a coating comprising a polymer of an aromatic 1,2-dialdehyde, said polymer having hydroxyl or polystyrene endcaps and a sensitizer capable, upon absorption of radiation, of yielding an acidic product, and heating said composition to about 90° C to about 150° C.
Claim 25
Dependent Claim
15 words
A process of claim 21 comprising contacting the heated coating with ammonia or an amine.
Claim 26
Dependent Claim
17 words
A process of claim 21 comprising contacting the heated coating with a solvent for the exposed coating.
Claim 27
Dependent Claim
13 words
A process of claim 21 in which said sensitizer upon irradiation, yields HBr.
Claim 28
Dependent Claim
69 words
A process of obtaining an image by depolymerization comprising exposing to electromagnetic radiation a photographic element comprising a polymer of an aromatic 1,2-dialdehyde, said polymer having hydroxyl or polystyrene endcaps and a sensitizer which, upon exposure, gives acidic products, contacting said element with a developer sheet comprising a support and a heat labile ammonia or amine-releasing compound and heating to a temperature of about 90° to about 150° C.
Claim 29
Dependent Claim
69 words
A process of obtaining an image by depolymerization comprising exposing to electromagnetic radiation a photographic element comprising a polymer of an aromatic 1,2-dialdehyde, said polymer having hydroxyl or polystyrene endcaps and a sensitizer which, upon exposure, gives acidic products, contacting said element with a developer sheet comprising a support and a heat labile ammonia or amine-releasing compound and heating to a temperature of about 90° to about 150° C.
Claim 30
Dependent Claim
13 words
A process of claim 25 in which said ammonia-releasing compound is ammonium formate.
Claim 31
Dependent Claim
13 words
A process of claim 25 in which said ammonia-releasing compound is ammonium thiocyanate.
References Cited (Backward Citations)
US2892712A
Cited
US3779778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |