US3963491A
Expired / Lapsed
US
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Imaging method
Assignee: Xerox Corp
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Filing: 1974-06-27
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Granted: 1976-06-15
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Expires: 1994-06-27
Abstract
Abstract Disclosed is an imaging method which involves exposing to activating radiation in an imagewise manner a film comprised of a matrix polymer as the principal ingredient, a degradable polymer and a photo-oxidant. Exposure of the film causes degradation of the degradable polymer, e.g., poly(acetaldehyde), whereupon the film undergoes a change in optical density in the exposed areas to provide a visible image.
Inventors
- 👤 Dana G. Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:45
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/039; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/108; Y10S430/11; Y10S430/114; Y10S430/116; Y10S522/00; Y10S522/904; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
167 words
An imaging method which comprises exposing to activating radiation in an imagewise manner a film comprising: a. a matrix polymer as the principal ingredient; b. a degradable polymeric composition containing segments characterized by the formula: ##EQU6## wherein R 1 is hydrogen or methyl and R 2 is hydrogen, an alkyl radical of 1 to 6 carbon atoms, a chlorinated or fluorinated aliphatic radical of 1 to 6 carbon atoms or a cyano substituted radical of 1 to 5 carbon atoms provided that when R 1 is methyl, R 2 is also methyl; and c. a photo-oxidant which upon activation is capable of abstracting one or more electrons from one or more oxygen atoms of said degradable polymeric composition, thereby causing the degradable polymer to break down into segments of greatly reduced molecular weight and thereby altering the relationship between the matrix polymer and degradable polymer to cause a change in the optical density in the exposed areas and provide a visible image corresponding to the exposed areas.
Claim 2
Dependent Claim
167 words
An imaging method which comprises exposing to activating radiation in an imagewise manner a film comprising: a. a matrix polymer as the principal ingredient; b. a degradable polymeric composition containing segments characterized by the formula: ##EQU6## wherein R 1 is hydrogen or methyl and R 2 is hydrogen, an alkyl radical of 1 to 6 carbon atoms, a chlorinated or fluorinated aliphatic radical of 1 to 6 carbon atoms or a cyano substituted radical of 1 to 5 carbon atoms provided that when R 1 is methyl, R 2 is also methyl; and c. a photo-oxidant which upon activation is capable of abstracting one or more electrons from one or more oxygen atoms of said degradable polymeric composition, thereby causing the degradable polymer to break down into segments of greatly reduced molecular weight and thereby altering the relationship between the matrix polymer and degradable polymer to cause a change in the optical density in the exposed areas and provide a visible image corresponding to the exposed areas.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the matrix polymer is poly(vinylchloride), poly(vinylformal), poly(methylmethacrylate), poly(vinylpyrrolidone), poly(vinylalcohol) or poly(vinylidene chloride).
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the degradable polymer is poly(acetaldehyde).
Claim 5
Dependent Claim
45 words
The method of claim 1 wherein the degradable polymer is a homopolymer represented by the formula: ##EQU7## wherein R 1 and R 2 are as previously defined and n is a number in the range of from 20 to 20,000 representing the degree of polymerization.
Claim 6
Dependent Claim
15 words
The method of claim 4 wherein R 1 is hydrogen and R 2 is methyl.
Claim 7
Dependent Claim
35 words
The method of claim 1 wherein the film contains from 0.1 to 49 weight percent of the degradable polymer, from 0.01 to 10 weight percent of the photo-oxidant with the remainder being the matrix polymer.
Claim 8
Dependent Claim
29 words
The method of claim 6 wherein the film contains from 5 to 10 weight percent of the degradable polymer and from 0.5 to 1 weight percent of the photo-oxidant.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein the activating radiation is light in the ultraviolet, near ultraviolet or visible regions of the spectrum.
Claim 10
Dependent Claim
42 words
The method of claim 1 wherein the photo-oxidant is an aromatic carbonyl compound, a pyrylium salt, anthracene or a derivative thereof, a diazonium salt, a para quinoid compound, an unsaturated anhydride, a tosylate salt, a diaza heterocyclic compound or a mixture thereof.
Claim 11
Dependent Claim
123 words
A composition of matter in the form of a thin film which can be imaged by exposure to activating radiation comprising: a. a matrix polymer as the principal ingredient; b. a degradable polymeric composition containing segments characterized by the formula: ##EQU8## wherein R 1 is hydrogen or methyl and R 2 is hydrogen, an alkyl radical of 1 to 6 carbon atoms, a chlorinated or fluorinated aliphatic radical of 1 to 6 carbon atoms or a cyano substituted radical of 1 to 5 carbon atoms provided that when R 1 is methyl, R 2 is also methyl; and c. a photo-oxidant which upon activation if capable of abstracting one or more electrons from one or more oxygen atoms of said degradable polymeric composition.
Claim 12
Dependent Claim
123 words
A composition of matter in the form of a thin film which can be imaged by exposure to activating radiation comprising: a. a matrix polymer as the principal ingredient; b. a degradable polymeric composition containing segments characterized by the formula: ##EQU8## wherein R 1 is hydrogen or methyl and R 2 is hydrogen, an alkyl radical of 1 to 6 carbon atoms, a chlorinated or fluorinated aliphatic radical of 1 to 6 carbon atoms or a cyano substituted radical of 1 to 5 carbon atoms provided that when R 1 is methyl, R 2 is also methyl; and c. a photo-oxidant which upon activation if capable of abstracting one or more electrons from one or more oxygen atoms of said degradable polymeric composition.
Claim 13
Dependent Claim
18 words
The composition of claim 10 wherein the matrix polymer is poly(vinylchloride), poly(vinylformal), poly(methylmethacrylate), poly(vinylpyrrolidone), poly(vinylalcohol) or poly(vinylidene chloride).
Claim 14
Dependent Claim
11 words
The composition of claim 10 wherein the degradable polymer is poly(acetaldehyde).
Claim 15
Dependent Claim
45 words
The composition of claim 10 wherein the degradable polymer is a homopolymer represented by the formula: ##EQU9## wherein R 1 and R 2 are as previously defined and n is a number in the range of from 20 to 20,000 representing the degree of polymerization.
Claim 16
Dependent Claim
15 words
The composition of claim 13 wherein R 1 is hydrogen and R 2 is methyl.
Claim 17
Dependent Claim
35 words
The composition of claim 10 wherein the film contains from 0.1 to 49 weight percent of the degradable polymer, from 0.01 to 10 weight percent of the photo-oxidant with the remainder being the matrix polymer.
Claim 18
Dependent Claim
29 words
The composition of claim 15 wherein the film contains from 5 to 10 weight percent of the degradable polymer and from 0.5 to 1 weight percent of the photo-oxidant.
Claim 19
Dependent Claim
42 words
The composition of claim 1 wherein the photo-oxidant is an aromatic carbonyl compound, a pyrylium salt, anthracene or a derivative thereof, a diazonium salt, a para quinoid compound, an unsaturated anhydride, a tosylate salt, a diaza heterocyclic compound or a mixture thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |