US4945020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive leuco dye containing electrostatic master with printout image
Assignee: EIDP Inc
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Filing: 1989-06-30
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Granted: 1990-07-31
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Expires: 2009-06-30
Abstract
Abstract High resolution, photosensitive electrostatic master which is positive-working with a single imagewise exposure comprising a conductive support bearing a layer of a photosensitive composition consisting essentially of (A) at least one polymeric binder, (B) a hexaarylbiimidazole photooxidant, (C) leuco dye, preferably stabilized, oxidized by (B), (D) a nonionic halogenated compound, preferably a hydrocarbon, and (E) compatible plasticizer. A process of making positive images by a single imagewise exposure is described. The master is useful in making proofs that duplicate the image achieved by printing, etc.
Inventors
- 👤 Richard J. Kempf
- 👤 Rolf Dessauer
- 👤 Steven C. Freilich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:55
CPC Classifications
G; G03; G03G; G03G5/00; G03F; G03F3/00; G03F3/10; G03F3/105; G03G5/02; G03G5/026
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
67 words
A high resolution, photosensitive electrostatic master which upon imagewise exposure forms conductive exposed image areas, the master comprising an electrically conductive substrate bearing a layer of a photosensitive composition consisting essentially of (A) at least one organic polymeric binder, (B) a hexaarylbiimidazole photooxidant, (C) a leuco dye that is oxidizable to an ionic species by the photooxidant, (D) a nonionic halogenated compound, and (E) a compatible plasticizer.
Claim 2
Dependent Claim
67 words
A high resolution, photosensitive electrostatic master which upon imagewise exposure forms conductive exposed image areas, the master comprising an electrically conductive substrate bearing a layer of a photosensitive composition consisting essentially of (A) at least one organic polymeric binder, (B) a hexaarylbiimidazole photooxidant, (C) a leuco dye that is oxidizable to an ionic species by the photooxidant, (D) a nonionic halogenated compound, and (E) a compatible plasticizer.
Claim 3
Dependent Claim
14 words
A photosensitive electrostatic master according to claim 1 wherein the photooxidant is a 2,2',4,4',5,5'-hexaarylbiimidazole.
Claim 4
Dependent Claim
13 words
A photosensitive electrostatic master according to claim 2 wherein the photooxidant is 2,2',4,4'-tetrakis(o-chlorophenyl)-5,5'-bis(m,p-dimethoxyphenyl)biimidazole.
Claim 5
Dependent Claim
13 words
A photosensitive electrostatic master according to claim 2 wherein the photooxidant is 2,2'-bis(o-chlorophenyl)-4,4',5,5'-tetraphenylbiimidazole.
Claim 6
Dependent Claim
15 words
A photosensitive electrostatic master according to claim 1 wherein the polymeric binder is poly(methyl methacrylate).
Claim 7
Dependent Claim
16 words
A photosensitive electrostatic master according to claim 1 wherein the polymeric binder is cellulose acetate butyrate.
Claim 8
Dependent Claim
14 words
A photosensitive electrostatic master according to claim 1 wherein the polymeric binder is polystyrene.
Claim 9
Dependent Claim
14 words
A photosensitive electrostatic master according to claim 1 wherein the leuco dye is stabilized.
Claim 10
Dependent Claim
15 words
A photosensitive electrostatic master according to claim 8 wherein the stabilized leuco dye is tris-(4-diethylamino-o-tolyl)methane.
Claim 11
Dependent Claim
15 words
A photosensitive electrostatic master according to claim 8 wherein the stabilized leuco dye is 9-diethylamino-12-(2-methoxy-carbonylphenyl)-benz(a)xanthene.
Claim 12
Dependent Claim
28 words
A photosensitive electrostatic master according to claim 1 wherein the halogenated compound is a halogenated hydrocarbon selected from the group consisting of aromatic, aliphatic, alicyclic and combinations thereof.
Claim 13
Dependent Claim
30 words
A photosensitive electrostatic master according to claim 11 wherein the halogenated hydrocarbon is substituted by a member selected from the group consisting of oxygen, amine, amide, hydroxyl, nitrile and phosphate.
Claim 14
Dependent Claim
14 words
A photosensitive electrostatic master according to claim 11 wherein the halogenated hydrocarbon is 1,2-dibromotetrachloroethane.
Claim 15
Dependent Claim
14 words
A photosensitive electrostatic master according to claim 11 wherein the halogenated hydrocarbon is trichloroacetamide.
Claim 16
Dependent Claim
31 words
A photosensitive electrostatic master according to claim 1 wherein the compatible plasticizer is selected from the group consisting of dioctyl phthalate, triacetin, t-butylphenyl diphenyl phosphate, diethyleneglycol dibenzoate and 2-ethylhexyl benzyl phthalate.
Claim 17
Dependent Claim
15 words
A photosensitive electrostatic master according to claim 15 wherein the plasticizer is 2-ethylhexyl benzyl phthalate.
Claim 18
Dependent Claim
16 words
A photosensitive electrostatic master according to claim 1 wherein the conductive substrate is aluminized polyethylene terephthalate.
Claim 19
Dependent Claim
69 words
A photosensitive electrostatic master according to claim 1 wherein binder (A) is present in 40 to 85% percent, photooxidant (B) is present in 1 to 20 percent, leuco dye (C) is present in 0.5 to 40 percent, halogenated compound (D) is present in 0.25 to 10 percent and plasticizer (E) is present in 2 to 50 percent, the weight percentages based on the total weight of the photosensitive composition.
Claim 20
Dependent Claim
14 words
A photosensitive electrostatic master according to claim 1 wherein a visible sensitizer is present.
Claim 21
Dependent Claim
17 words
A photosensitive electrostatic master according to claim 19 wherein the visible sensitizer is an arylylidene aryl ketone.
Claim 22
Dependent Claim
14 words
A photosensitive electrostatic master according to claim 1 wherein a thermal stabilizer is present.
Claim 23
Dependent Claim
14 words
A photosensitive electrostatic master according to claim 21 wherein the thermal stabilizer is 1-phenyl-3-pyrazolidone.
Claim 24
Dependent Claim
31 words
A photosensitive electrostatic master according to claim 1 wherein the layer of photosensitive composition consists essentially of (A) poly(methyl methacrylate), (B) 2,2'-bis(o-chlorophenyl)-4,4',5,5'-tetraphenylbiimidazole (C) tris-(4-diethylamino-o-tolyl)methane, (D) 1,2-dibromotetrachloroethane, and (E) 2-ethylhexyl benzyl phthalate.
Claim 25
Dependent Claim
17 words
A photosensitive electrostatic master according to claim 1 wherein over the photosensitive layer is a protective coversheet.
Claim 26
Dependent Claim
116 words
A xeroprinting process for making positive images by a single imagewise exposure comprising (A) exposing imagewise to actinic radiation a photosensitive electrostatic master comprising an electrically conductive substrate bearing a layer of a photosensitive composition consisting essentially of (A) at least one organic polymeric binder, (B) a hexaarylbiimidazole photooxidant, (C) a leuco dye that is oxidizable to an ionic species by the photooxidant, (D) a nonionic halogenated compound, and (E) a compatible plasticizer, (B) charging the master electrostatically to form a latent image of electrostatic charge in the unexposed areas, (C) developing the latent image by applying an oppositely charged electrostatic toner or developer, and (D) transferring the toned or developed image to a receptor surface.
Claim 27
Dependent Claim
116 words
A xeroprinting process for making positive images by a single imagewise exposure comprising (A) exposing imagewise to actinic radiation a photosensitive electrostatic master comprising an electrically conductive substrate bearing a layer of a photosensitive composition consisting essentially of (A) at least one organic polymeric binder, (B) a hexaarylbiimidazole photooxidant, (C) a leuco dye that is oxidizable to an ionic species by the photooxidant, (D) a nonionic halogenated compound, and (E) a compatible plasticizer, (B) charging the master electrostatically to form a latent image of electrostatic charge in the unexposed areas, (C) developing the latent image by applying an oppositely charged electrostatic toner or developer, and (D) transferring the toned or developed image to a receptor surface.
Claim 28
Dependent Claim
20 words
A process according to claim 25 wherein the actinic radiation is in the spectral range of 310 to 500 nm.
Claim 29
Dependent Claim
16 words
A process according to claim 25 wherein the source of actinic radiation is an ultraviolet/visible light.
Claim 30
Dependent Claim
20 words
A process according to claim 25 wherein the source of actinic radiation is an ultraviolet light emitting cathode ray tube.
Claim 31
Dependent Claim
19 words
A process according to claim 25 wherein the source of actinic radiation is an ultraviolet or visible light-emitting laser.
Claim 32
Dependent Claim
16 words
A process according to claim 25 wherein the source of actinic radiation is an electron beam.
Claim 33
Dependent Claim
15 words
A process according to claim 25 wherein the master is electrostatically charged by corona discharge.
Claim 34
Dependent Claim
18 words
A process according to claim 25 wherein the image is developed by means of a liquid electrostatic developer.
Claim 35
Dependent Claim
53 words
A process according to claim 32 wherein the liquid electrostatic developer consists essentially of a carrier liquid having a Kauributanol value of less than 30, present in major amount, thermoplastic resin particles having an average particle size of less than 10 μm, and a carrier liquid soluble ionic or zwitterionic charge director compound.
Claim 36
Dependent Claim
18 words
A process according to claim 25 wherein the image is developed by means of a dry electrostatic toner.
Claim 37
Dependent Claim
16 words
A process according to claim 25 wherein the toned image is transferred to a paper receptor.
Claim 38
Dependent Claim
16 words
A process according to claim 25 wherein the toned image is transferred to an insulating board.
Claim 39
Dependent Claim
117 words
A xeroprinting process for making positive images by a single imagewise exposure comprising (A) exposing imagewise to ultraviolet/visible light source a photosensitive electrostatic master comprising an electrically conductive substrate bearing a layer of a photosensitive composition consisting essentially of (A) at least one organic polymeric binder, (B) a hexaarylbiimidazole photooxidant, (C) a leuco dye that is oxidizable to an ionic species by the photooxidant, (D) a nonionic halogenated compound, and (E) a compatible plasticizer. (B) charging the master by corona discharge to form a latent image of electrostatic charge in the unexposed areas, (C) developing the latent image by applying an oppositely charged electrostatic toner or developer, and (D) transferring the developed image to a paper receptor.
Claim 40
Dependent Claim
117 words
A xeroprinting process for making positive images by a single imagewise exposure comprising (A) exposing imagewise to ultraviolet/visible light source a photosensitive electrostatic master comprising an electrically conductive substrate bearing a layer of a photosensitive composition consisting essentially of (A) at least one organic polymeric binder, (B) a hexaarylbiimidazole photooxidant, (C) a leuco dye that is oxidizable to an ionic species by the photooxidant, (D) a nonionic halogenated compound, and (E) a compatible plasticizer. (B) charging the master by corona discharge to form a latent image of electrostatic charge in the unexposed areas, (C) developing the latent image by applying an oppositely charged electrostatic toner or developer, and (D) transferring the developed image to a paper receptor.
Claim 41
Dependent Claim
30 words
A process according to claim 37 wherein the layer of photosensitive composition consists essentially of (A) poly(methyl methacrylate), (B) 2,2'-bis(o-chlorophenyl)-4,4',5,5'-tetraphenylbiimidazole, (C) tris-(4-diethylamino-o-tolyl)methane, (D) 1,2-dibromotetrachloroethane, and (E) 2-ethyl hexyl benzyl phthalate.
Claim 42
Dependent Claim
53 words
A process according to claim 37 wherein the liquid electrostatic developer consists essentially of a carrier liquid having a Kauributanol value of less than 30, present in major amount, thermoplastic resin particles having an average particle size of less than 10 μm, and a carrier liquid soluble ionic or zwitterionic charge director compound.
Claim 43
Dependent Claim
53 words
A process according to claim 38 wherein the liquid electrostatic developer consists essentially of a carrier liquid having a Kauributanol value of less than 30, present in major amount, thermoplastic resin particles having an average particle size of less than 10 μm, and a carrier liquid soluble ionic or zwitterionic charge director compound.
Claim 44
Dependent Claim
18 words
A process according to claim 37 wherein the image is developed by means of a dry electrostatic toner.
Claim 45
Dependent Claim
22 words
A process according to claim 25 wherein over the photosensitive layer is a protective coversheet which is removed prior to imagewise exposure.
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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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |