Patent US2247392A successfully refreshed from Google Patents.
Patent US4596754A successfully refreshed from Google Patents.
US4596754A
Expired / Lapsed
US
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Electrophotographic printing original plate and electrophotographic plate making process using the printing original plate
Assignee: Ricoh Co Ltd
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Filing: 1985-04-23
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Granted: 1986-06-24
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Expires: 2005-04-23
Abstract
Abstract An electrophotographic printing original plate is disclosed, which comprises an electroconductive support material and an electrophotographic photosensitive layer formed thereon, which electrophotographic photosensitive layer comprises (i) a charge generation layer consisting essentially of a particular azo pigment serving as a charge generating material and (ii) a charge transport layer consisting essentially of a charge transporting material and an alkali-soluble resin; and an electrophotographic printing plate making process using the above printing original plate is also disclosed, which comprises the steps of electrically charging uniformly the above printing original plate, exposing the charged printing original plate to optical images to form latent electrostatic images thereon, developing the latent electrostatic images with toner, fixing the toner images to the printing original plate, and removing the electrophotographic photosensitive layer portions corresponding to the non-image areas of the printing original plate by dissolving the photosensitive layer portions in a dissolving liquid, thereby making a printing plate.
Inventors
- 👤 Kyoji Tsutsui
- 👤 Mitsuru Hashimoto
- 👤 Masafumi Ohta
- 👤 Masaomi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:09
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0675; G03G5/0679; G03G5/0683; G03G5/0685; C; C09; C09B; C09B35/00; C09B35/02; C09B35/021; C09B35/03; C09B35/031; C09B35/033; C09B35/039; C09B35/06; C09B35/08; C09B35/10; C09B35/14; C09B35/233; C09B35/378; C09B56/00; C09B56/04; C09B56/12; G03G5/043; G03G5/047; G03G5/0681
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
293 words
An electrophotographic printing original plate which comprises: a. an electroconductive support material, and b. an electrophotographic photosensitive layer formed thereon, said electrophotographic photosensitive layer comprising (i) a charge generating layer consisting essentially of an azo pigment serving as a charge generating material and (ii) a charge transport layer consisting essentially of a charge transporting material and an alkali-soluble resin, said azo pigment being selected from the group consisting of the azo pigments having the following formulas (1) through (44): ##STR165## wherein A represents a coupler residue selected from the group consisting of the coupler residues having the formulas (A-1) through (A-6): ##STR166## wherein R 1 is hydrogen, an alkyl group, an unsubstituted or substituted phenyl group; X is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group; Y is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or ##STR167## (in which R 2 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, an unsubstituted or substituted styryl group; R 3 is hydrogen, an alkyl group, an unsubstituted or substituted phenyl group; or R 2 and R 3 can form a ring in combination with carbon atoms bonded to R 2 and R 3 ), ##STR168## wherein R 4 is an unsubstituted or substituted hydrocarbon group, ##STR169## wherein R 4 is an unsubstituted or substituted hydrocarbon group, ##STR170## wherein R 5 is an alkyl group, a carbamoyl group, a carboxyl group or an ester group thereof; Ar 1 is an unsubstituted or substituted cyclic hydrocarbon group, ##STR171## wherein R 6 is an unsubstituted or substituted hydrocarbon group and Ar 2 is an unsubstituted or substituted cyclic hydrocarbon group; and Ar in the formulas (5), (8) and (9) represents ##STR172##
Claim 2
Dependent Claim
293 words
An electrophotographic printing original plate which comprises: a. an electroconductive support material, and b. an electrophotographic photosensitive layer formed thereon, said electrophotographic photosensitive layer comprising (i) a charge generating layer consisting essentially of an azo pigment serving as a charge generating material and (ii) a charge transport layer consisting essentially of a charge transporting material and an alkali-soluble resin, said azo pigment being selected from the group consisting of the azo pigments having the following formulas (1) through (44): ##STR165## wherein A represents a coupler residue selected from the group consisting of the coupler residues having the formulas (A-1) through (A-6): ##STR166## wherein R 1 is hydrogen, an alkyl group, an unsubstituted or substituted phenyl group; X is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group; Y is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or ##STR167## (in which R 2 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, an unsubstituted or substituted styryl group; R 3 is hydrogen, an alkyl group, an unsubstituted or substituted phenyl group; or R 2 and R 3 can form a ring in combination with carbon atoms bonded to R 2 and R 3 ), ##STR168## wherein R 4 is an unsubstituted or substituted hydrocarbon group, ##STR169## wherein R 4 is an unsubstituted or substituted hydrocarbon group, ##STR170## wherein R 5 is an alkyl group, a carbamoyl group, a carboxyl group or an ester group thereof; Ar 1 is an unsubstituted or substituted cyclic hydrocarbon group, ##STR171## wherein R 6 is an unsubstituted or substituted hydrocarbon group and Ar 2 is an unsubstituted or substituted cyclic hydrocarbon group; and Ar in the formulas (5), (8) and (9) represents ##STR172##
Claim 3
Dependent Claim
32 words
An electrophotographic printing original plate as claimed in claim 1, wherein said charge generation layer further comprises an alkali-soluble resin and the amount of said azo pigment is 30 wt.% or more.
Claim 4
Dependent Claim
29 words
An electrophotographic printing original plate as claimed in claim 1, wherein the thickness of said charge generation layer is in the range of from 0.05 μm to 5 μm.
Claim 5
Dependent Claim
49 words
An electrophotographic printing original plate as claimed in claim 1, wherein said charge transporting material in said charge transport layer is selected from the group consisting of a positive hole transporting material and an electron transporting material and is in an amount ranging from 10 wt.% to 70 wt.%.
Claim 6
Dependent Claim
60 words
An electrophotographic printing original plate as claimed in claim 1, wherein said positive hole transporting material is selected from the group consisting of: 2,5-bis(4-diethylaminophenyl)-1,3,4-oxadiazole, 2,5-bis 4-(4-diethylaminostyryl)phenyl-1,3,4-oxadiazole, 2-(9-ethylcarbazolyl-3-)-5-(4-diethylaminophenyl)-1,3,4-oxadiazole, 2-vinyl-4-(2-chlorophenyl)-5-(4-diethylamino)oxazole, 2-(4-diethylaminophenyl)-4-phenyloxazole, 1-phenyl-3-(4-diethylaminostyryl)-5-(4-diethylaminophenyl)pyrazoline, 1-phenyl-3-(4-dimethylaminostyryl)-5-(4-dimethylaminophenyl)pyrazoline, 2,2'-dimethyl-4,4'-bis(diethylamino)triphenylmethane, 1,1-bis(4-dibenzylaminophenyl)propane, tris(4-diethylaminophenyl)methane, 9-(4-dimethylaminobenzylidene)fluorene, 3-(9-fluorenylidene)-9-ethylcarbazole, 9-(4-diethylaminostyryl)anthracene, 9-bromo-10-(4-diethylaminostyryl)anthracene, 1,2-bis(4-diethylaminostyryl)benzene, 1,2-bis(2,4-dimethoxystyryl)benzene, 9-ethylcarbazole-3-aldehyde 1-methyl-1-phenylhydrazone, 9-ethylcarbazole-3-aldehyde 1-benzyl-1-phenylhydrazone, 4-diethylaminobenzaldehyde 1,1-diphenylhydrazone, 2,4-dimethoxybenzaldehyde 1-benzyl-1-phenylhydrazone, 4-diphenylaminobenzaldehyde 1-methyl-1-phenylhydrazone, 4-diphenylaminostilbene, 4-dibenzylaminostilbene, 4-ditolylaminostilbene, 1-(4-diphenylaminostyryl)naphthalene, 1-(4-dibenzylaminostyryl)naphthalene, 4'-diphenylamino-α-phenylstilbene, 4'-methylphenylamino-α-phenylstilbene, 3-styryl-9-ethylcarbazole, and 3-(4-diethylamino)styryl-9-ethylcarbazole.
Claim 7
Dependent Claim
33 words
An electrophotographic printing original plate as claimed in claim 4, wherein said electron transporting material is selected from the group consisting of chloranil, bromanil, tetracyanoethylene, tetracyanoquinonedimethane, 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2,4,5,7-tetranitroxanthone, 2,4,8-trinitrothioxanthone, 2,6,8-trinitro-4H-indeno[2,4-b]thiophene-4-one, and 1,3,7-trinitrodibenzothiophene-5,5-dioxide.
Claim 8
Dependent Claim
40 words
An electrophotographic printing original plate as claimed in claim 1, wherein said alkali-soluble resin in said charge transport layer is selected from the group consisting of a styrene-maleic anhydride copolymer, styrene-methacrylic acid-methacrylate copolymer, a methacrylic acid-methacrylate copolymer and phenolic resin.
Claim 9
Dependent Claim
29 words
An electrophotographic printing original plate as claimed in claim 1, wherein the thickness of said charge transport layer is in the range of from 2 μm to 50 μm.
Claim 10
Dependent Claim
38 words
An electrophotographic printing original plate as claimed in claim 1, wherein said charge transport layer further comprises a plasticizer selected from the group consisting of dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dimethyl glycol phthalate and ethylphthalyl ethyl glycolate.
Claim 11
Dependent Claim
19 words
An electrophotographic printing original plate as claimed in claim 1, wherein said electroconductive support material has a hydrophilic surface.
Claim 12
Dependent Claim
59 words
An electrophotographic printing original plate as claimed in claim 1, wherein said electroconductive support material is made of a material selected from the group consisting of an aluminum plate, a zinc plate, a copper-aluminum bimetal plate, a copper-stainless steel bimetal plate, a chrome-copper bimetal plate, a chrome-copper-aluminum trimetal plate, a chrome-lead-iron trimetal plate, and a chrome-copper-stainless steel trimetal plate.
Claim 13
Dependent Claim
143 words
An electrophotographic printing plate making process comprising the steps of: a. electrically charging uniformly an electrophotographic printing original plate comprising an electroconductive support material and an electrophotographic photosensitive layer formed thereon, which electrophotographic photosensitive layer comprises (i) a charge generation layer consisting essentially of an azo pigment serving as a charge generating material and (ii) a charge transport layer consisting essentially of a charge transporting material and an alkali-soluble resin, b. exposing said charged printing original plate to optical images to form latent electrostatic images thereon, c. developing the latent electrostatic images with toner, d. fixing the toner images to said printing original plate, and e. removing the electrophotographic photosensitive layer portions which bear no toner image, corresponding to the non-image areas of the printing original plate, by dissolving the photosensitive layer portions in a dissolving liquid capable of dissolving said alkali-soluble resin.
Claim 14
Dependent Claim
143 words
An electrophotographic printing plate making process comprising the steps of: a. electrically charging uniformly an electrophotographic printing original plate comprising an electroconductive support material and an electrophotographic photosensitive layer formed thereon, which electrophotographic photosensitive layer comprises (i) a charge generation layer consisting essentially of an azo pigment serving as a charge generating material and (ii) a charge transport layer consisting essentially of a charge transporting material and an alkali-soluble resin, b. exposing said charged printing original plate to optical images to form latent electrostatic images thereon, c. developing the latent electrostatic images with toner, d. fixing the toner images to said printing original plate, and e. removing the electrophotographic photosensitive layer portions which bear no toner image, corresponding to the non-image areas of the printing original plate, by dissolving the photosensitive layer portions in a dissolving liquid capable of dissolving said alkali-soluble resin.
References Cited (Backward Citations)
US3104169A
Cited
US4427754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |