Physically developable copy medium with photoconductors and complexing agent
阅读：950发布：2023-08-05
专利汇可以提供Physically developable copy medium with photoconductors and complexing agent专利检索，专利查询，专利分析的服务。并且This invention relates to a copy medium capable of transmitting ultraviolet radiation comprising a photosensitive layer having a photoconductive material such as titanium dioxide and certain complexing agents incorporated in a binder. The photosensitive material, upon exposure to activating radiation in an image pattern, becomes reversibly activated in the image pattern. The reversibly activated portions are then capable of causing a chemical reaction which permits development and formation of an irreversible image by physical development such as by contact with a chemical redox system, an aqueous solution of silver nitrate and a suitable photographic reducing agent being an example thereof. The copy medium of the invention is characterized by having a photosensitive layer of reduced photoconductor coat weight without the expected decrease in sensitometric characteristics such as reduced image optical density. The reduced coat weight of photoconductor is made possible by the addition of the complexing agent to the photosensitive material. A copy medium having a photosensitive layer of reduced photoconductor coat weight is an advantage as it permits more efficient use of the copy medium for various applications such as use as a diazo master wherein the medium must transmit radiation which is absorbed by the photoconductor e.g., ultraviolet radiation. Another advantage of reduced photoconductor coat weight is reduced manufacturing costs as a result of more efficient use of photoconductor and associated spectral sensitizing dyes.，下面是Physically developable copy medium with photoconductors and complexing agent专利的具体信息内容。
2. The copy medium of claim 1 where the photosensitive photoconductor material is a silver halide.
3. The copy medium of claim 1 wherein said photosensitive photoconductor material is a metal oxide of a Group VIA metal.
4. The copy medium of claim 3 where said photosensitive photoconductor material is titanium dioxide.
5. The copy medium of claim 4 where said titanium dioxide and complexing agent are dispersed in a binder.
6. The copy medium of claim 5 where the ratio of titanium dioxide and complexing agent to binder varies between 1 part titanium dioxide and complexing agent to 1 part binder to 50 parts titanium dioxide and complexing agent to 1 part binder.
7. The copy medium of claim 5 where the ratio of titanium dIoxide and complexing agent to binder varies between about 2 parts titanium dioxide and complexing agent to 1 part binder and 12 parts titanium dioxide and complexing agent to 1 part binder.
8. The copy medium of claim 5 where the ratio of titanium dioxide and complexing agent to binder is about 6:1.
9. The copy medium of claim 5 where the photosensitive layer has a dry thickness not exceeding one-half mil.
10. The copy medium of claim 4 where the coat weight of titanium dioxide in the photosensitive layer varies between 1 1/2 and 3 grams per square meter of support.
11. The copy medium of claim 4 where the complexing agent comprises from 1 to 50 percent by weight of the total of the titanium dioxide and the complexing agent.
12. The copy medium of claim 11 where the complexing agent comprises from 2 to 30 percent by weight of the total of the titanium dioxide and complexing agent.
13. The copy medium of claim 12 where the complexing agent is selected from the group of
14. The copy medium of claim 13 where the complexing agent conforms to formula I and is selected from the group of triethanolamine, nitrilotriacetic acid, iminodiacetic acid, N-(2-hydroxyethyl)-iminodiacetic acid, nitrilotripropionic acid and the alkali metal and ammonium salts.
15. The copy medium of claim 13 where the complexing agent conforms to formula II and is selected from the group of ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, 1,2-diaminocyclohexane-N,N,N'',N'',-tetraacetic acid, 1,3-diamino-2-hydroxypropane-N,N,N'',N''-tetraacetic acid, 1,2-diamino-propane-N,N,N'',N'',-tetraacetic acid, (ethylenebis(oxyethylene-nitrilo)) tetraacetic acid, ethylenediamine-N,N''-diacetic acid, and the alkali metal and ammonium salts thereof.
16. The copy medium of claim 13 where the complexing agent is selected from the group of ethylenediaminetetraacetic acid and nitrilotriaacetic acid and their alkali metal and ammonium salt.
17. The copy medium of claim 13 where the complexing agent is ethylenediaminetetraacetic acid or its alkali metal or ammonium salts.
18. The copy medium of claim 13 where the complexing agent is nitrilotriaacetic acid or its alkali or metal ammonium salts.
19. A copy medium capable of transmitting ultraviolet radiation comprising a transparent or translucent support and a photosensitive layer, said photosensitive layer comprising titanium dioxide and a complexing agent for silver dispersed in a translucent or transparent binder, said complexing agent comprising from 1 to 50 percent by weight of the total of said titanium dioxide and said complexing agent, the ratio of said titanium dioxide and complexing agent to said binder being between 2 parts titanium dioxide and complexing agent per part binder and 12 parts by weight titanium dioxide and complexing agent per part binder, the coat weight of said titanium oxide over said support not exceeding about 4 grams per square meter of said support.
20. The copy medium of claim 19 where said complexing agent comprises 2 to 30 percent by weight of the total of said titanium dioxide and complexing agent.
21. The copy medium of claim 19 where the ratio of said titanium dioxide and complexing agent to said binder is about 6 parts titanium dioxide and complexing agent per 1 part of binder.
22. The copy medium of claim 19 where the coat weight of said titanium dioxide over said support varies between 1 1/2 and 3 grams per square meter.
23. The copy medium of claim 19 where the complexing agent is selected from the group of
24. The copy medium of claim 23 where the complexing agent conforms to formula I and is selected from the group of triethanolamine, nitrilotriaacetic acid, iminodiacetic acid, N-(2-hydroxyethyl)-iminodiacetic acid, nitrilotripropionic acid and the alkali metal and ammonium salts.
25. The copy medium of claim 23 where the complexing agent conforms to formula II and is selected from the group of ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, 1,2-diaminocyclohexane-N,N,N'',N'',-tetraacetic acid, 1,3-diamino-2-hydroxypropane-N,N,N'',N'',-tetraacetic acid, 1,2-diaminopropane-N,N,N'',N'',-tetraacetic acid, (ethylenebis(oxy-ethylenenitrilo)) tetraacetic acid, ethylenediamine-N,N''-diacetic acid, and the alkali metal and ammonium salts thereof.
26. The copy medium of claim 23 where the complexing agent is selected from the group of ethylenediaminetetraacetic acid and nitrilotriaacetic acid and their alkali metal and ammonium salts.
27. The copy medium of claim 1 as a diazo master.
28. The copy medium of claim 13 as a diazo master.
29. The copy medium of claim 19 as a diazo master.
30. The copy medium of claim 26 as a diazo master.
31. The copy medium of claim 19 where the dry thickness of the photosensitive layer does not exceed one-half mil.
32. The method of forming a diazo master comprising the steps of exposing the copy medium of claim 1 to a source of radiation and contacting the so exposed copy medium with a physical developer comprising a first solution of reducible metal ions and then a second solution of a reducing agent therefor.
33. The process of claim 32 where the reducible metal ions are selected from the group consisting of Ag, Hg 2, Pb 4, Au 1, Au 3, Pt 2, Pt 4, Ni 2, Sn 2, Pb 2, Cu 1, and Cu 2.
34. The process of claim 33 where the solution of reducible metal ions is a solution of silver ions.
35. The process of claim 32 where the reducing agent is selected from the group consisting of o- and p-aminophenol, p-methylaminophenol sulfate, p-hydroxyphenyl glycine, o- and p-phenylenediamine, 1-phenyl-3-pyrazolidone, alkali and alkaline earth metal oxalates and formates.
36. The process of claim 32 where the total contact time of the copy medium with both the solution of the reducible metal ions and the complexing agents does not exceed 5 seconds.
37. The process of claim 32 where the total contact time of the copy medium with both the solution of the reducible metal ions and the complexing agent does not exceed 2 seconds.
38. The method of copying comprising the steps of (1) exposing the copy medium of claim 19 to a source of radiation, (2) contacting the so exposed copy medium with a physical developer comprising a first solution of reducible metal ions and a second solution of a reducing agent therefor, and (3) using the thus prepared imaged medium to expose a second photographic copy medium to thereby produce a copy of the imaged medium.
39. The process of claim 38 where the reducible metal ions are selected from the group consisting of Ag , Hg 2, Pb 4, Au 1, Au 3, Pt 2, Pt 4, Ni 2, Sn 2, Pb 2, Cu 1, and Cu 2.
40. The process of claim 39 where the solution of reducible metal ions is a solution of silver ions.
41. The process of claim 38 where the reducing agent is selected from the group consisting of o- and P-aminophenol, p-methylaminophenol sulfate, p-hydroxyphenyl glycine, o- and p-phenylenediamine, 1-phenyl-3-pyrazolidone, alkali and alkaline earth metal oxalates anf formates.
42. The process of claim 38 where the total contact time of the copy medium with both the solution of the reducible metal ions and the complexing agents does not exceed 5 seconds.
43. The process of claim 38 where the total contact time of the copy medium with both the solution of the reducible metal ions and the complexing agents does not exceed 2 seconds.
44. The process of claim 43 wherein the exposure of the second copy medium is performed by contact printing.
45. The process of claim 44 wherein the second photographic copy medium comprises a diazo copy medium which is then developed to form a visible image.
46. The process of claim 38 comprising the additional step of adding or deleting material from the imaged copy medium of step (2) prior to the exposure of the second copy medium.
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