EP0323854A2
Expired / Lapsed
EP
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Electrophotographic lithographic printing plate precursor
Assignee: Fujifilm Holdings Corp
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Filing: 1989-01-05
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Granted: —
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Expires: 2009-01-05
Abstract
Abstract An electrophotographic lithographic printing plate precursor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder is disclosed, wherein the resin binder comprises at least one resin (A) containing at least one functional group capable of forming at least one hydroxyl group upon decomposition and at least one member selected from the group consisting of (B) a heat- and/or photo-curable resin and a crosslinking agent. Since the hydroxyl group formed in the resin (A) enhances hydrophilic properties of nonimage areas, the printing plate obtained from the precursor is resistant to background stains. This effect is further ensured by the crosslinked structure formed between the resin (A)and the resin (B) and/or a crosslinking agent.
Inventors
- 👤 Eiichi C/O Fuji Photo Film Co. Ltd. Kato
- 👤 Kazuo C/O Fuji Photo Film Co. Ltd. Ishii
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:18
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0532; G03G5/055; G03G5/0535; G03G5/0542; G03G5/0546; G03G5/0589; G03G5/0592
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
An electrophotographic lithographic printing plate precursor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises at least one resin (A) containing at least one functional group capable of forming at least one hydroxyl group upon decomposition and at least one member selected from the group consisting of (B) a heat- and/or photo-curable resin and a crosslinking agent.
Claim 2
Dependent Claim
73 words
An electrophotographic lithographic printing plate precursor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises at least one resin (A) containing at least one functional group capable of forming at least one hydroxyl group upon decomposition and at least one member selected from the group consisting of (B) a heat- and/or photo-curable resin and a crosslinking agent.
Claim 3
Dependent Claim
116 words
An electrophotographic lithographic printing plate precursor as claimed in claim 1, wherein said resin (A) is a resin containing at least one functional group represented by formula (I): -O-L (I) wherein L is selected from the group consisting of -CO-Y₁, -CO-T-Y₂, -CH=CH-CH₃, wherein R₁, R₂, and R₃, which may be the same or different, are each selected from the group consisting of a hydrogen atom, a hydrocarbon group, and -O-R′, wherein R′ represents a hydrocarbon group; X is selected from the group consisting of a sulfur atom and an oxygen atom; Y₁ and Y₂ each represents a hydrocarbon group; and T is selected from the group consisting of an oxygen atom, a sulfur atom, and -NH-.
Claim 4
Dependent Claim
201 words
An electrophotographic lithographic printing plate precursor as claimed in claim 2, wherein said resin (A) is a resin obtained by polymerizing a monomer represented by formula (II): wherein V is selected from the group consisting of an aromatic group, and a heterocyclic group, wherein Q₁, Q₂, Q₃, and Q₄ are each selected from the group consisting of a hydrogen atom, a hydrocarbon group, and the group -W-O-L in formula (II); b₁ and b₂, which may be the same or different, are each selected from the group consisting of a hydrogen atom, a hydrocarbon group, and the group -W-O-L in formula (II); and n represents 0 or an integer of from 1 to 18; W represents a carbon-carbon bond for linking V and -O-L which may contain a hetero atom; a₁ and a₂, which may be the same or different, are each selected from the group consisting of a hydrogen atom, a hydrocarbon group, a hydroxyl group, and -COO-Z, wherein Z is selected from the group consisting of an alkyl, alkenyl, aralkyl, alicyclic, and an aromatic group having 1 to 18 carbon atoms which may be substituted with a group containing the group -O-L; and L is as defined in claim 2.
Claim 5
Dependent Claim
41 words
An electrophotographic lithographic printing plate precursor as claimed in claim 1, wherein said resin (A) is a resin containing at least one functional group in which at least two hydroxyl groups spaced sterically close together are protected with one protective group.
Claim 6
Dependent Claim
108 words
An electrophotographic lithographic printing plate precursor as claimed in claim 4, wherein said functional group is selected from a group represented by formula (III): wherein R₅ and R₆, which may be the same or different, are each selected from the group consisting of a hydrogen atom, a hydrocarbon group, and -O-O-R₇, wherein R₇ represents a hydrocarbon group; and U represents a carbon-carbon bond -(C) n - wherein n is 0, 1, 2 or 3 which may contain a hetero atom; a group represented by formula (IV): wherein U is as defined above; and a group represented by formula (V): wherein R₅, R₆, and U are as defined above.
Claim 7
Dependent Claim
40 words
An electrophotographic lithographic printing plate precursor as claimed in claim 1, wherein said resin (A) contains a copolymer component containing a functional group capable of crosslinking with the resin (B) and/or the crosslinking agent by heating or irradiation of light.
Claim 8
Dependent Claim
40 words
An electrophotographic lithographic printing plate precursor as claimed in any one of claims 1 to 6, wherein said resin (A) is present in an amount of from about 1 to about 90% by weight based on the total resin binder.
Claim 9
Dependent Claim
36 words
An electrophotographic lithographic printing plate precursor as claimed in any one of claims 1 to 7, wherein a weight ratio of the resin (A) to the resin (B) is from about 5 to 80:95 to 20.
Claim 10
Dependent Claim
40 words
An electrophotographic lithographic printing plate precursor as claimed in any one of claims 1 to 8, wherein said crosslinking agent is present in an amount of from about 0.1 to about 30% by weight based on the total resin binder.
References Cited (Backward Citations)
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