US4477547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making complex layer type lithografic printing plate
Assignee: Mitsubishi Paper Mills Ltd
•
Filing: 1983-01-06
•
Granted: 1984-10-16
•
Expires: 2003-01-06
Abstract
Abstract Disclosed is a method for making a complex layer type lithographic printing plate by forming a toner image on a printing original plate having organic electrophotographic photosensitive layer by electrophotographic process and treating non-image area other than the toner image area with an etching solution mainly composed of an alcohol solvent and/or an alkali solvent, said photosensitive layer being a complex layer type photosensitive layer which comprises a charge carrier generating layer comprising a charge carrier generating substance and a binder mainly composed of a polyamide resin soluble in alcohol solvent and a high molecular substance having compatibility with said resin and having a group soluble in alcohol solvent and/or alkali solvent and a charge carrier transport layer containing a high molecular substance having a group soluble in an etching solution mainly composed of alcohol solvent and/or alkali solvent and thereafter treating non-image area other than the toner image area with the etching solution.
Inventors
- 👤 Jun Yamada
- 👤 Takao Senga
- 👤 Shigeyoshi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:48
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0557; G03G5/0571; G03G13/00; G03G13/26; G03G13/28; G03G5/043; G03G5/047; G03G5/0589
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
150 words
A method for making a complex layer type lithographic printing plate which comprises forming a toner image on an original printing plate having organic electrophotographic photosensitive layer by electrophotographic process, said photosensitive layer being a complex layer type photosensitive layer which comprises a charge carrier generating layer comprising a charge carrier generating substance and a binder mainly composed of a polyamide resin soluble in alcohol solvent and a high molecular substance having compatibility with said polyamide resin and having a group soluble in an etching solution mainly composed of alcohol solvent and/or an alkali solvent to accelerate dissolution in said etching solution and a charge carrier transport layer comprising a charge carrier transport substance and a high molecular substance having a group soluble in an etching solution mainly composed of alcohol solvent and/or alkali solvent and thereafter treating non-image area other than the toner image area with the etching solution.
Claim 2
Independent Claim
150 words
A method for making a complex layer type lithographic printing plate which comprises forming a toner image on an original printing plate having organic electrophotographic photosensitive layer by electrophotographic process, said photosensitive layer being a complex layer type photosensitive layer which comprises a charge carrier generating layer comprising a charge carrier generating substance and a binder mainly composed of a polyamide resin soluble in alcohol solvent and a high molecular substance having compatibility with said polyamide resin and having a group soluble in an etching solution mainly composed of alcohol solvent and/or an alkali solvent to accelerate dissolution in said etching solution and a charge carrier transport layer comprising a charge carrier transport substance and a high molecular substance having a group soluble in an etching solution mainly composed of alcohol solvent and/or alkali solvent and thereafter treating non-image area other than the toner image area with the etching solution.
Claim 3
Independent Claim
31 words
A method for making a complex layer type lithographic printing plate according to claim l, wherein the polyamide resin of the binder for the charge carrier generating layer is copolymer nylon.
Claim 4
Dependent Claim
44 words
A method for making a complex layer type lithographic printing plate according to claim 1 wherein the high molecular substance of the binder for the charge carrier generating layer is one having acid anhydride group, carboxylic acid group, sulfonic acid group or sulfonimide group.
Claim 5
Dependent Claim
28 words
A method for making a complex layer type lithographic printing plate according to claim 1 wherein the charge carrier generating substance is an organic pigment or sensitizing dye.
Claim 6
Dependent Claim
43 words
A method for making a complex layer type lithographic printing plate according to claim 1 wherein the charge carrier transport substance is an aromatic tertiary amino compound, an aromatic tertiary diamino compound, an aromatic tertiary triamino compound, a condensate or a heterocyclic compound.
Claim 7
Dependent Claim
49 words
A method for making a complex layer type lithographic printing plate according to claim 1 wherein the high molecular substance contained in the binder for the charge carrier transfer layer is one having acid anhydride group, carboxylic acid group, sulfonic acid group or sulfonimide group or a phenolic resin.
Claim 8
Dependent Claim
122 words
An original printing plate having organic electrophotographic photosensitive layer on a support for complex layer type lithographic printing plate on which a toner image is formed, said photosensitive layer comprising a charge carrier generating layer comprising a charge carrier generating substance and a binder mainly composed of a polyamide resin soluble in alcohol solvent and a high molecular substance having compatibility with said polyamide resin and having a group soluble in an etching solution mainly composed of alcohol solvent and/or alkali solvent to accelerate dissolution is said etching solution and a charge carrier transport layer comprising a charge carrier transport substance and a high molecular substance having a group soluble in an etching solution mainly composed of alcohol solvent and/or alkali solvent.
Claim 9
Dependent Claim
122 words
An original printing plate having organic electrophotographic photosensitive layer on a support for complex layer type lithographic printing plate on which a toner image is formed, said photosensitive layer comprising a charge carrier generating layer comprising a charge carrier generating substance and a binder mainly composed of a polyamide resin soluble in alcohol solvent and a high molecular substance having compatibility with said polyamide resin and having a group soluble in an etching solution mainly composed of alcohol solvent and/or alkali solvent to accelerate dissolution is said etching solution and a charge carrier transport layer comprising a charge carrier transport substance and a high molecular substance having a group soluble in an etching solution mainly composed of alcohol solvent and/or alkali solvent.
Claim 10
Dependent Claim
23 words
A printing method which comprises carrying out printing with the complex layer type lithographic printing plate made by the method of claim 1.
References Cited (Backward Citations)
US3816118A
Cited
GB1337228A
Cited
GB1343671A
Cited
US3895944A
Cited
US4066453A
Cited
US3981728A
Cited
DE2917486A1
Cited
US4435491A
Cited
JPS57142643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |