US4013473A
Expired / Lapsed
US
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Recording materials and image receiving materials for producing copies in a dry way
Assignee: Agfa Gevaert NV
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Filing: 1975-08-21
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Granted: 1977-03-22
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Expires: 1995-08-21
Abstract
Abstract Thermographic recording material or image-receiving material for dry copying processes comprising at least one layer and a substantially non-photosensitive reducible silver salt, a reducing agent, and optionally a toning agent or toning mixture, wherein the reducing agent corresponds to the following general formula: ##STR1## wherein: EACH OF R 1 , R 3 and R 5 (equal or different) represents hydrogen, a straight-chain or branched alkyl group comprising 1 to 9 carbon atoms, or a cycloalkyl group, with the proviso that R 1 and R 5 do not represent hydrogen simultaneously, R 2 represents a straight-chain or branched alkyl group comprising 1 to 4 carbon atoms, or a cycloalkyl group, R 4 represents hydrogen, or a straight-chain or branched alkyl group comprising 1 to 4 carbon atoms, or a cycloalkyl group, And wherein each of R 1 and R 2 together, R 2 and R 3 together or R 4 and R 5 together optionally represent a straight-chain or branched alkylene group for completing a 6-membered ring; provided that that R 1 , R 5 or R 3 does not represent t-butyl if the respective adjacent substituent(s) represent(s) a straight-chain or branched alkyl group.
Inventors
- 👤 Jozef Frans Willems
- 👤 Albert Lucien Poot
- 👤 Jan Frans Van Besauw
- 👤 Alfons Klein
- 👤 Karlfried Wedemeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:47
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/4989; C; C07; C07C; C07C37/00; C07C37/11; C07C37/14; C07C37/50; C07C37/52; C07C45/00; C07C45/002; G03C1/49827; C07C2601/00; C07C2601/06; C07C2601/08; C07C2601/12; C07C2601/14; C07C2602/00; C07C2602/02; C07C2602/04; C07C2602/10; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
94 words
Thermographic recording material or image-receiving material for dry copying processes comprising at least one layer and a substantially non-photosensitive reducible silver salt, a reducing agent, and optionally a toning agent or toning mixture, wherein the reducing agent corresponds to the following general formula: ##STR5## wherein: at least one of R 1 and R 5 represents a cyclopentyl group and the other, if any, represents hydrogen, R 2 represents a lower alkyl group containing 1-4 carbon atoms, R 3 represents hydrogen or a lower alkyl group containing 1-4 carbon atoms, and R 4 represents hydrogen.
Claim 2
Dependent Claim
94 words
Thermographic recording material or image-receiving material for dry copying processes comprising at least one layer and a substantially non-photosensitive reducible silver salt, a reducing agent, and optionally a toning agent or toning mixture, wherein the reducing agent corresponds to the following general formula: ##STR5## wherein: at least one of R 1 and R 5 represents a cyclopentyl group and the other, if any, represents hydrogen, R 2 represents a lower alkyl group containing 1-4 carbon atoms, R 3 represents hydrogen or a lower alkyl group containing 1-4 carbon atoms, and R 4 represents hydrogen.
Claim 3
Dependent Claim
22 words
Material according to claim 1, wherein the non-photosensitive silver salt and the reducing agent are present in a supported or self-supporting layer.
Claim 4
Dependent Claim
36 words
Material according to claim 1, wherein the non-photosensitive silver salt and the reducing agent are present in adjacent layers, and the reducing agent is transferrable by heat in the adjacent layer comprising the non-photosensitive silver salt.
Claim 5
Dependent Claim
25 words
Material according to claim 1, wherein the non-photosensitive silver salt is a silver salt of an aliphatic carboxylic acid containing at least 14 carbon atoms.
Claim 6
Dependent Claim
15 words
Material according to claim 1, wherein the silver salt is silver behenate or silver stearate.
Claim 7
Dependent Claim
25 words
Material according to claim 1, wherein the phenol derivative is present in an amount of at least 0.25 mole per mole of non-photosensitive silver salt.
Claim 8
Dependent Claim
11 words
Material according to claim 1, wherein a toning agent is present.
Claim 9
Dependent Claim
22 words
Material according to claim 7, wherein the toning agent is 2H-phthalazinone-(1), a phthalimide or phthalazinone derivative or a benz- or naphthoxazin-1,3-dione derivative.
Claim 10
Dependent Claim
109 words
Thermographic recording process for the production of visible silver images by image-wise heating a material comprising at least one layer and a substantially non-photosensitive silver salt and a reducing agent by exposure to infrared radiation, wherein by heating a reduction occurs of the non-photosensitive silver salt by means of a reducing agent according to the following general formula: ##STR6## wherein: at least one of R 1 and R 5 represents a cyclopentyl group and the other, if any, represents hydrogen, R 2 represents a lower alkyl group containing 1-4 carbon atoms, R 3 represents hydrogen or a lower alkyl group containing 1-4 carbon atoms, and R 4 represents hydrogen.
Claim 11
Dependent Claim
109 words
Thermographic recording process for the production of visible silver images by image-wise heating a material comprising at least one layer and a substantially non-photosensitive silver salt and a reducing agent by exposure to infrared radiation, wherein by heating a reduction occurs of the non-photosensitive silver salt by means of a reducing agent according to the following general formula: ##STR6## wherein: at least one of R 1 and R 5 represents a cyclopentyl group and the other, if any, represents hydrogen, R 2 represents a lower alkyl group containing 1-4 carbon atoms, R 3 represents hydrogen or a lower alkyl group containing 1-4 carbon atoms, and R 4 represents hydrogen.
Claim 12
Dependent Claim
38 words
Process according to claim 9, wherein a material is used comprising the non-photosensitive silver salt and the reducing agent in adjacent layers, said reducing agent being transferrable by heat in the adjacent layer containing the non-photosensitive silver salt.
Claim 13
Dependent Claim
29 words
Process according to claim 9, wherein said image-wise heating is carried out with an original containing infrared-absorbing image markings, which are brought into heat-conductive contact with the recording material.
Claim 14
Dependent Claim
176 words
Photographic recording process for the production of a visible silver image by (1) the image-wise exposure of a material comprising a layer that contains a photo-oxidizable reducing agent, which can be transferred by heat, and a photosensitive substance, which on the exposed areas transforms the reducing agent in a non-transferrable form by oxidation, (2) contacting the exposed layer with an image-receiving layer, which contains a substantially non-photosensitive silver salt, optionally a toning agent and a reducing agent, and (3) overall heating the contacting layers, the photo-oxidizable reducing agent being transferred from the non-exposed layers of the photosensitive layer into the image-receiving layer wherein the image-wise reduction of the substantially non-photosensitive silver salt takes place in the presence of a phenol derivative of the following formula: ##STR7## wherein: at least one of R 1 and R 5 represents a cyclopentyl group and the other, if any, represents hydrogen, R 2 represents a lower alkyl group containing 1-4 carbon atoms, R 3 represents hydrogen or a lower alkyl group containing 1-4 carbon atoms, and R 4 represents hydrogen.
Claim 15
Dependent Claim
176 words
Photographic recording process for the production of a visible silver image by (1) the image-wise exposure of a material comprising a layer that contains a photo-oxidizable reducing agent, which can be transferred by heat, and a photosensitive substance, which on the exposed areas transforms the reducing agent in a non-transferrable form by oxidation, (2) contacting the exposed layer with an image-receiving layer, which contains a substantially non-photosensitive silver salt, optionally a toning agent and a reducing agent, and (3) overall heating the contacting layers, the photo-oxidizable reducing agent being transferred from the non-exposed layers of the photosensitive layer into the image-receiving layer wherein the image-wise reduction of the substantially non-photosensitive silver salt takes place in the presence of a phenol derivative of the following formula: ##STR7## wherein: at least one of R 1 and R 5 represents a cyclopentyl group and the other, if any, represents hydrogen, R 2 represents a lower alkyl group containing 1-4 carbon atoms, R 3 represents hydrogen or a lower alkyl group containing 1-4 carbon atoms, and R 4 represents hydrogen.
Claim 16
Dependent Claim
21 words
Recording process according to claim 12, wherein the heating step is effected in a temperature range of 50° to 200° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |