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Patent US4882248A successfully refreshed from Google Patents.
US4882248A
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Electrophotographic plate for making printing plate comprising phthalocyanine pigment and thiobarbituric acid residue containing compound
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1988-03-14
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Granted: 1989-11-21
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Expires: 2008-03-14
Abstract
Abstract An electrophotographic plate for making a printing plate is provided. Said electrophotographic plate comprises an electrically conductive and hydrophilic base and a photoconductive layer provided thereon, said photoconductive layer containing an alkali and/or alcohol soluble polymer, a phtalocyanine pigment and a compound represented by the formula (I): (X).sub.n Y (I) where X represents thiobarbituric acid residue from which one hydrogen atom at 5-position has been eliminated and in which nitrogen atom in a ring may have a substituent; Y represents an n-valent substituted or unsubstituted alkylene or aralkylene residue; and n represents an integer of 2 to 4. This plate has high sensitivity and resolving power and from this plate a printing plate of high printing endurance and low printing strain can be made.
Inventors
- 👤 Jun Yamada
- 👤 Hiromi Eguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:47
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0644; G03G5/0661
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
97 words
An electrophotographic plate for making a printing plate therefrom which comprises an electrically conductive and hydrophilic base and a photoconductive layer provided thereon, said photoconductive layer containing an alkali and/or alcohol soluble polymer, a phthalocyanine pigment and a compound represented by the formula (I): (X).sub.n Y (I) wherein X represents thiobarbituric acid residue from which one hydrogen atom at the 5-position has been eliminated and in which a nitrogen atom in a ring may have a substituent; Y represents an n-valent substituted or unsubstituted alkylene or aralkylene residue; and n represents an integer of 2 to 4.
Claim 2
Dependent Claim
97 words
An electrophotographic plate for making a printing plate therefrom which comprises an electrically conductive and hydrophilic base and a photoconductive layer provided thereon, said photoconductive layer containing an alkali and/or alcohol soluble polymer, a phthalocyanine pigment and a compound represented by the formula (I): (X).sub.n Y (I) wherein X represents thiobarbituric acid residue from which one hydrogen atom at the 5-position has been eliminated and in which a nitrogen atom in a ring may have a substituent; Y represents an n-valent substituted or unsubstituted alkylene or aralkylene residue; and n represents an integer of 2 to 4.
Claim 3
Dependent Claim
20 words
An electrophotographic plate according to claim 1 wherein the polymer is a vinyl acetate based polymer or an acrylic polymer.
Claim 4
Dependent Claim
14 words
An electrophotographic plate according to claim 1 wherein the phthalocyanine pigment is ε-copper phthalocyanine.
Claim 5
Dependent Claim
22 words
An electrophotographic plate according to claim 1 wherein the compound represented by the formula (I) is selected from the following group: ##STR2##
Claim 6
Dependent Claim
26 words
An electrophotographic plate according to claim 1 wherein the content of the compound represented by the formula (I) is 1-20% by weight of the phthalocyanine pigment.
Claim 7
Dependent Claim
43 words
A method for making a printing plate from the electrophotographic plate of claim 1 which comprises imagewise exposing the electrophotographic plate, subjecting the exposed plate to development with toner to form an image and then dissolving out the non-image portion with a solution.
Claim 8
Dependent Claim
31 words
A method according to claim 6 wherein the solution for dissolving out the non-image portion of the photoconductive layer is an aqueous solution of an inorganic or organic alkali and/or alcohol.
Claim 9
Dependent Claim
10 words
A printing plate made by the method of claim 6.
Claim 10
Dependent Claim
17 words
A method of printing which comprises mounting the printing plate of claim 8 and carrying out printing.
Claim 11
Dependent Claim
27 words
An electrophotographic plate according to claim 1 wherein the content of the phthalocyanine pigment is 30% or less by weight based on the weight of the polymer.
Claim 12
Dependent Claim
26 words
An electrophotographic plate according to claim 10 wherein the content of the compound represented by the formula (I) is 1-20% by weight of the phthalocyanine pigment.
Claim 13
Dependent Claim
43 words
A method for making a printing plate from the electrophotographic plate of claim 10 which comprises imagewise exposing the electrophotographic plate, subjecting the exposed plate to development with toner to form an image and then dissolving out the non-image portion with a solution.
Claim 14
Dependent Claim
25 words
A method according to claim 12 wherein the content of the compound represented by the formula (I) is 1-20% by weight of the phthalocyanine pigment.
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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |