US4220710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive recording materials
Assignee: Agfa Gevaert NV
•
Filing: 1978-01-23
•
Granted: 1980-09-02
•
Expires: 1998-01-23
Abstract
Abstract A photosensitive recording material containing in admixture in a binder medium: (1) as imaging substance an organo-tellurium compound containing directly linked to a tellurium atom halogen and at least one organic substituent comprising at least one carbonyl group, (2) a photoreductant which upon exposure to activating radiation in the presence of a hydrogen-donating compound reduces said organo-tellurium compound to liberate metallic tellurium and halogen acid, (3) a hydrogen-donating compound from which hydrogen can be abstracted by the photo-exposed photoreductant, and (4) an organic reducing agent precursor, from which by the action of an acid a compound capable of reducing said organo-tellurium compound can be set free.
Inventors
- 👤 Wilhelmus Janssens
- 👤 Frans C. Heugebaert
- 👤 Hendrik E. Kokelenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/705; G03C1/72; G03C1/73; G03C1/734; Y; Y10; Y10S; Y10S430/00; Y10S430/156
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A photosensitive recording material containing in admixture in a binder medium: 1. as imaging substance an organo-tellurium compound containing directly linked to a tellurium atom halogen and at least one organic substituent comprising at least one carbonyl group, 2. a photoreductant which upon exposure to activating radiation in the presence of a hydrogen-donating compound reduces said organo-tellurium compound to liberate metallic tellurium and halogen acid, 3. a hydrogen-donating compound from which hydrogen can be abstracted by the photo-exposed photoreductant, and 4. an organic reducing agent precursor, from which by the action of an acid a compound capable of reducing said organo-tellurium compound can be set free and which satisfies the assessment tests A and B as described in the specification.
Claim 2
Dependent Claim
120 words
A photosensitive recording material containing in admixture in a binder medium: 1. as imaging substance an organo-tellurium compound containing directly linked to a tellurium atom halogen and at least one organic substituent comprising at least one carbonyl group, 2. a photoreductant which upon exposure to activating radiation in the presence of a hydrogen-donating compound reduces said organo-tellurium compound to liberate metallic tellurium and halogen acid, 3. a hydrogen-donating compound from which hydrogen can be abstracted by the photo-exposed photoreductant, and 4. an organic reducing agent precursor, from which by the action of an acid a compound capable of reducing said organo-tellurium compound can be set free and which satisfies the assessment tests A and B as described in the specification.
Claim 3
Dependent Claim
52 words
A material according to claim 1, wherein the organo-tellurium compound corresponds to the following general formula: R.sub.x TeCl.sub.y wherein: R represents an organic group which by a carbon atom is linked to the tellurium atom and contains at least one carbonyl group, x is 1, 2 or 3 and x+y is 4.
Claim 4
Dependent Claim
30 words
A material according to claim 2, wherein the organo-tellurium compound corresponds to the following general formula: (Ar--CO--CH.sub.2).sub.2 TeCl.sub.2 wherein: Ar stands for an aromatic group including a substituted aromatic group.
Claim 5
Dependent Claim
13 words
A material according to claim 3, wherein the organo-tellurium compound is bis(phenacyl)-tellurium dichloride.
Claim 6
Dependent Claim
13 words
A material according to claim 1, wherein the photoreductant is an aromatic diketone.
Claim 7
Dependent Claim
14 words
A material according to claim 5, wherein the aromatic diketone is 9,10-phenanthrenequinone or 2-t-butylanthraquinone.
Claim 8
Dependent Claim
40 words
A material according to claim 1, wherein the hydrogen-donating compound has a hydrogen atom bonded to a carbon atom, to which the oxygen atom of a hydroxyl group or the trivalent nitrogen atom of an amine substituent are also bonded.
Claim 9
Dependent Claim
103 words
A material according to claim 7, wherein the hydrogen-donating compound corresponds to the following general formula: ##STR20## wherein: each of R 10 and R 11 , which may be the same or different, represents hydrogen, a hydrocarbon group including a straight chain, branched chain and cyclic hydrocarbon group, or an alkoxycarbonyl group, Z represents a single bond, an ethynylene group ##STR21## or the group ##STR22## wherein n represents a whole number, and each of R 12 and R 13 , which may be the same or different, represents hydrogen, or an alkyl group or together form part of a carbocyclic or heterocyclic ring.
Claim 10
Dependent Claim
13 words
A material according to claim 8, wherein the hydrogen-donating compound is phenyl-1,2-ethane diol.
Claim 11
Dependent Claim
39 words
A material according to claim 1, wherein the organic reducing agent precursor is a para- or ortho-dihydroxyaryl compound at least one of whose hydroxyl groups has been esterified and whose remaining hydroxyl group (if any) may have been etherified.
Claim 12
Dependent Claim
40 words
A material according to claim 1, wherein the organic reducing agent precursor is derived from a pyrazolidin-3-one reductor, in which the active hydrogen atom in the 2-position is temporarily blocked by reaction with an isocyanate or with an acid halide.
Claim 13
Dependent Claim
160 words
A recording process comprising the steps of (a) information-wise exposing a photosensitive recording material containing in admixture in a binder medium: (1) as imaging substance an organo-tellurium compound containing directly linked to a tellurium atom halogen and at least one organic substituent comprising at least one carbonyl group, (2) a photoreductant which upon exposure to activating radiation in the presence of a hydrogen-donating compound reduces said organo-tellurium compound to liberate metallic tellurium and halogen acid, (3) a hydrogen-donating compound from which hydrogen can be abstracted by the photo-exposed photoreductant, and (4) an organic reducing agent precursor, from which by the action of an acid a compound capable of reducing said organo-tellurium compound can be set free and which satisfies the assessment tests A and B as described in the specification, the exposure being effected with electromagnetic radiation to which the photoreductant is sensitive, and (b) overall heating the exposed material to develop a tellurium metal image in the photo-exposed areas.
Claim 14
Dependent Claim
160 words
A recording process comprising the steps of (a) information-wise exposing a photosensitive recording material containing in admixture in a binder medium: (1) as imaging substance an organo-tellurium compound containing directly linked to a tellurium atom halogen and at least one organic substituent comprising at least one carbonyl group, (2) a photoreductant which upon exposure to activating radiation in the presence of a hydrogen-donating compound reduces said organo-tellurium compound to liberate metallic tellurium and halogen acid, (3) a hydrogen-donating compound from which hydrogen can be abstracted by the photo-exposed photoreductant, and (4) an organic reducing agent precursor, from which by the action of an acid a compound capable of reducing said organo-tellurium compound can be set free and which satisfies the assessment tests A and B as described in the specification, the exposure being effected with electromagnetic radiation to which the photoreductant is sensitive, and (b) overall heating the exposed material to develop a tellurium metal image in the photo-exposed areas.
Claim 15
Dependent Claim
22 words
A recording process according to claim 12, wherein the overall heating proceeds in the temperature range of 80° C. to 200° C.
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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |