EP0133469B1 - Matériaux d'enregistrement électrophotographiques à photosensibilité - Google Patents
Matériaux d'enregistrement électrophotographiques à photosensibilité Download PDFInfo
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- EP0133469B1 EP0133469B1 EP84107504A EP84107504A EP0133469B1 EP 0133469 B1 EP0133469 B1 EP 0133469B1 EP 84107504 A EP84107504 A EP 84107504A EP 84107504 A EP84107504 A EP 84107504A EP 0133469 B1 EP0133469 B1 EP 0133469B1
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- 239000001018 xanthene dye Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
- G03G5/0503—Inert supplements
- G03G5/051—Organic non-macromolecular compounds
- G03G5/0514—Organic non-macromolecular compounds not comprising cyclic groups
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
- G03G5/0503—Inert supplements
- G03G5/051—Organic non-macromolecular compounds
- G03G5/0517—Organic non-macromolecular compounds comprising one or more cyclic groups consisting of carbon-atoms only
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
- G03G5/0662—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic containing metal elements
Definitions
- the invention relates to electrophotographic recording materials with electrically conductive supports, charge carrier-producing compounds or sensitizers, charge carrier transporting compounds and special additives.
- Electrophotographic processes, materials required therefor and various variants for the construction of recording materials are known.
- Advantages for use in the reproduction sector are materials made of polymeric binders that can be adapted to the special requirements of the respective field of application, low molecular weight organic compounds that are soluble in the binders even in higher concentrations and are capable of transporting charge carriers of the electrical current, and compounds , in particular dyes or pigments, which generate charge carriers of the electrical current by absorption of the actinic light radiated imagewise and which can transfer them to the charge-transporting compounds with the aid of the electrical field impressed from the outside by the electrostatic surface charge.
- these charge carrier-producing compounds can be introduced as a separate layer within a composite structure (cf.
- the multilayer electrophotographic recording material described in DE-OS 2220408 consists of an electrically conductive carrier material, a first, dye-containing, about 0.005 to 2 gm thick, by exposure to actinic light charge carriers of the electric current generating layer of dark insulating organic materials with at least a charge transporting connection.
- High photosensitivity is particularly desirable in order to reduce the required process times.
- the necessary exposure time plays an important role.
- the existing systems are frequently criticized.
- the present invention was based on the task of developing electrophotographic recording materials, in particular for the production of electrophotographic printing forms, such as offset printing forms, which have improved photosensitivity, at the same time a low dark conductivity and good resolution.
- the compounds used according to the invention are known or can be prepared by known methods, for. B. according to the Gmelin Handbook of Inorganic Chemistry, Syst. No. 39 rare earths, vol. D3, 8th edition 1981, pp. 65 ff.
- the addition of the metal 1,3-diketone complexes according to the invention greatly improves the photosensitivity and at the same time also significantly increases the maximum potential acceptance of the electrophotographic recording materials without changing the dark properties, so that an improved differentiation in relation to the photosensitivity is also achieved occurs between exposed and unexposed areas of the loaded surface.
- metal halides - such as zinc chloride, magnesium bromide, aluminum chloride - and ketones - such as acetophenone, benzophenone, benzil - can also improve the photosensitivity of certain organic photo semiconductor layers in small amounts (e.g. US 3,037,861, US 3 553 009, U.S. 3,620,723). It has also been confirmed that additions of metal halides and ketones do not produce the effects according to the invention. The effect of the metal-1,3-diketone complexes achieved according to the invention cannot be derived from the known additives for the person skilled in the art.
- the metal-1,3-diketone complexes which improve the photosensitivity and are used according to the invention can advantageously be used both in single-layer and in multi-layer recording systems applied to electroconductive supports.
- Suitable single-layer systems preferably have a layer of (a) 45 to 75 parts by weight of a binder, (b) 30 to 60, in particular 35 to 50 parts by weight of a charge carrier transporting compound, (c) optionally 5 to 25 parts by weight of another on a conductive carrier material , essentially inactive binder, (d) 0.05 to 0.8 parts by weight of a compound which generates charge carriers upon actinic exposure, in particular a suitable dye, and (e) 0.5 to 30, in particular 3 to 15% by weight, based on the binder content, one or more of the metal 1,3-diketone complexes according to the invention.
- the layers are advantageously applied from an approx.
- Suitable multilayer systems advantageously have on an electroconductive carrier material (a) a layer with compounds generating charge carriers and (b) a further layer with (b1) at least one charge carrier transporting compound, (b2) at least one organic binder and (b3) optionally further, in particular additives which improve the mechanical properties of the layer, layer (b) 0.5 to 30 and preferably 3 to 15% by weight. based on the binder content, contains one or more of the metal 1,3-diketone complexes according to the invention.
- the layer (b) advantageously contains 30 to 60 parts by weight of (b1), 45 to 75 parts by weight of (b2) and, if appropriate, 5 to 25 parts by weight of the additives (b3).
- the first layer is advantageously applied to the support material in a thickness of 0.005 to 5, in particular 0.1 to 0.9 ⁇ m from solution in a suitable solvent.
- the second layer is advantageously applied in a thickness that results in a layer thickness of 5 to 25, in particular 7 to 15 ⁇ m, after drying the composite structure.
- all conductive carrier materials can be used as electrically conductive carriers, insofar as they are suitable for the area of application.
- aluminum, zinc, magnesium, copper or multi-metal plates for. B. raw or pretreated, e.g. B. roughened and / or anodized aluminum sheets, aluminum foils, polymer films with metallized Surface such as aluminum-coated polyethylene terephthalate films or also electrically conductive special papers.
- Carriers for printing forms advantageously have a thickness of 0.08 to approximately 0.3 mm.
- suitable organic binders for the layers depends on the intended use of the recording materials.
- their film-forming and electrical properties, their adhesive strength on the carrier material and their solubility properties play a special role.
- Particularly suitable for recording materials for the production of electrophotographic printing plates, and especially for those for offset printing are those which are soluble in basic, aqueous or alcoholic solvents. These are mainly substances with alkali solubilizing.
- binders especially those with high acid numbers, which are readily soluble in basic aqueous-alcoholic solvent systems and have an average molecular weight (weight average) of 800 to 150,000 and in particular 1,200 and 80,000.
- binders with free carboxyl groups are known to undesirably increase the dark conductivity of the electrophotographic layers and thereby lead to poor stressing results, such binders can easily be adapted to the charge transport compounds used. It has been shown that copolymers of styrene, maleic anhydride and acrylic or methacrylic acid, which have a copolymerized maleic anhydride content of 5 to 50% by weight and a copolymerized acrylic or methacrylic acid content of 5 to 35 and in particular 10 to 30% by weight. -%, have satisfactory electrophotographic layers with sufficient dark conductivity. They have excellent solubility in washing-out agents consisting of 75% by weight of water, 23% by weight of isobutanol and 2% by weight of soda, but are insoluble in offset-typical cleaning water.
- Suitable charge carrier-producing compounds or sensitizers are e.g. B. for single-layer systems, such as those used for the production of electrophotographic printing forms, dyes from the triarylmethane series, xanthene dyes and cyanine dyes. Very good results were obtained with rhodamine B (C.I. 45170), rhodamine 6 G (C.I. 45160), malachite green (C.I. 42000), methyl violet (C.I. 42535) and crystal violet (C.I. 42555). In systems applied in multiple layers, the dye or pigment is present in a separate layer which generates charge carriers.
- Azo dyes, phthalocyanines, isoindoline dyes and perylene tetracarboxylic acid derivatives are particularly effective here. Good results are achieved with perylene-3,4: 9,10-tetracarboxylic acid diimide derivatives, as described in DE-OS 31 10 954 and 31 10 960.
- Suitable charge carriers of the connections carrying electrical current are known to the person skilled in the art. Mention may be made of oxazole derivatives (DBP 11 20 875), oxdiazole derivatives (DBP 10 58 836), triazole derivatives (DBP 10 60 260), azomethines (US 3 041 165), pyrazoline derivatives (DBP 10 60 714) and imidazole derivatives (DBP 1106599). Benztriazole derivatives (German patent application P 32 15 968.4) and hydrazone derivatives (German patent application P 32 01 202.0) are preferred. These are usually low molecular weight compounds which are well compatible with the organic binders in the required amount. However, polymeric charge transport compounds can also be used, e.g. B. Poly (N-vinyl carbazole).
- the electrophotographic recording material according to the invention may contain conventional additives, e.g. B. leveling agents and plasticizers in the photoconductive layer or adhesion promoter between carrier and layer.
- conventional additives e.g. B. leveling agents and plasticizers in the photoconductive layer or adhesion promoter between carrier and layer.
- the electrophotographic recording materials according to the invention are distinguished by a combination of very good properties, in particular a high photoconductivity with a very low dark conductivity, so that the layers are very suitable for copying technology.
- the high sensitivity to light allows a significant reduction in the exposure time when processing in the repro camera compared to commercially available materials.
- a good resolution results from a very sharp image reproduction. Thanks to a high charge contrast, even fine halftone dots in the light tonal ranges can be reproduced well.
- the exposure of the layers leads to very low residual stresses and the images obtained during the concreting are characterized by good basic freedom in the non-image areas.
- electrophotographic offset printing forms takes place, as usual, by electrostatically charging the electrophotographic recording material using a high-voltage corona, immediately following image-wise exposure, developing the electrostatic latent charge image present using a dry or liquid toner, fixing the toner by means of a subsequent melting process and removing it the unstressed, photo-semiconducting layer by means of a suitable washout solvent.
- the printing form thus obtained can still be prepared in a known manner for offset printing, e.g. B. by hydrophilization and gumming the water-bearing surface.
- the layers are evenly charged to a surface potential of -600 volts with a DC corona of -8.5 kV at a distance of 1 cm and then exposed to the white light of a high-pressure xenon lamp with an illuminance of 10 ⁇ W ⁇ cm ⁇ 2 in the layer plane.
- the photo-induced potential drop during the exposure is tracked over time until the surface potential has fallen below 5% of the originally present value. Then the time is determined which elapses before the surface potential drops by half, corrected by the amount of the dark drop.
- the half-value photosensitivity as the product of half-life and illuminance in the plate plane is given in ⁇ J ⁇ cm- 2 .
- Example 2 The procedure is as in Example 1, but instead of the tris (dipivalomethanato) -Europium the same amount of pure dipivalomethane (C 11 H 20 O 2 ) is used.
- the half-value photosensitivity is 29.5 ⁇ J ⁇ cm- 2 .
- Example 2 The procedure is as in Example 1, but the tris (dipivalomethanato) europium is replaced by tris [1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctandionato- (4,6)] holmium Ho (FOD) 3 (C 30 H 3 () F 21 H 0 O 6 ), example 2) or tris (dipivalomethanato) praseodymium Pr (DPM) 3 (C 33 H 57 PrO 6 ) example 3).
- the half-value photosensitivities are 21.6 ( ⁇ j ⁇ cm-2 and 16.5 ⁇ J ⁇ cm-2.
- this printing plate After a charge, this printing plate is exposed in a camera for 12 seconds using a high-voltage corona. It is then developed with a powder toner that is burned-in at 160 ° C and resistant to abrasion.
- the unconcrete layer is washed off with a mixture of 0.5% soda, 25% isopropanol and 74.5% water, which exposes the aluminum surface.
- the solutions are spread over the layer with a cotton ball. The differentiation into hydrophilic and oleophilic areas desired in offset printing is obtained, the carrier surface providing the hydrophilic areas.
- the printing plate After the treatment with the alkaline liquid, the printing plate is rinsed with water and the hydrophilicity of the support surface is further increased by wiping with dilute phosphoric acid solution. After inking with bold ink, it is used to print in a known manner in offset printing machines.
- a layer of 60 parts of a chlorinated perylene-3,4: 9,10-tetracarboxylic acid diimide bisbenzimidazole with a chlorine content of about 38% and 50 parts of a commercially available copolymer of vinyl chloride is placed on a polyethylene terephthalate film with a vapor-deposited, conductive aluminum layer in a thickness of approximately 300 ⁇ , Acrylic acid and a maleic acid diester applied in a thickness of about 0.55 microns as a charge carrier generating layer.
- a charge transport layer consisting of 45 parts of a commercially available polycarbonate binder with a melting range of 220 to 230 ° C., 10 parts of a polyester with an acid number of approximately 40 and a molecular weight of approximately 4500, 40 is made from a solution in ethyl acetate onto this layer which generates charge carriers Parts of p-diethylaminobenzaldehyde diphenylhydrazone and 4 parts of tris (dipivalomethanato) praseodymium are applied in such a way that after drying off the solvent and drying for 30 minutes at 80 ° C., a dry layer thickness of 12 wm results.
- a half-value photosensitivity of 2.35 ⁇ J ⁇ cm- 2 is determined on this layer.
- the same layer without tris (dipivalomethanato) praseodymium has a half-value photosensitivity of about 4.8 ⁇ J ⁇ c m -2 .
- Example 7 If the layer of Example 7 is used as a copy film in a commercially available copier with dry toner, copies of good quality and in large numbers can be produced with it.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photoreceptors In Electrophotography (AREA)
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3324089 | 1983-07-05 | ||
DE3324089A DE3324089A1 (de) | 1983-07-05 | 1983-07-05 | Elektrophotographische aufzeichnungsmaterialien mit verbesserter photoempfindlichkeit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0133469A1 EP0133469A1 (fr) | 1985-02-27 |
EP0133469B1 true EP0133469B1 (fr) | 1987-09-09 |
Family
ID=6203115
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84107504A Expired EP0133469B1 (fr) | 1983-07-05 | 1984-06-28 | Matériaux d'enregistrement électrophotographiques à photosensibilité |
Country Status (4)
Country | Link |
---|---|
US (1) | US4556621A (fr) |
EP (1) | EP0133469B1 (fr) |
JP (1) | JPS6064356A (fr) |
DE (2) | DE3324089A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6148859A (ja) * | 1984-08-17 | 1986-03-10 | Konishiroku Photo Ind Co Ltd | 正帯電用感光体 |
US4895783A (en) * | 1989-01-03 | 1990-01-23 | Xerox Corporation | Overcoated electrophotographic photoreceptor contains metal acetyl acetonate in polymer layer |
JPH0588396A (ja) * | 1991-09-27 | 1993-04-09 | Fuji Electric Co Ltd | 電子写真感光体 |
US5232808A (en) * | 1991-12-20 | 1993-08-03 | Eastman Kodak Company | Electrostatographic toner and developer containing a fluorinated β-diketone metal complex charge-control agent |
JP2000056488A (ja) * | 1998-08-06 | 2000-02-25 | Fuji Electric Co Ltd | 電子写真用感光体 |
US7167615B1 (en) | 1999-11-05 | 2007-01-23 | Board Of Regents, The University Of Texas System | Resonant waveguide-grating filters and sensors and methods for making and using same |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE558078A (fr) * | 1956-06-04 | |||
NL99153C (fr) * | 1957-09-07 | |||
NL242505A (fr) * | 1958-08-20 | |||
DE1117391B (de) * | 1959-03-18 | 1961-11-16 | Kalle Ag | Elektrophotographisches Verfahren zur Herstellung von Druckformen |
GB1150435A (en) * | 1965-04-28 | 1969-04-30 | Rank Xerox Ltd | Electrophotographic Material |
DE1522497C3 (de) * | 1966-05-13 | 1974-09-19 | Kalle Ag, 6202 Wiesbaden-Biebrich | Verfahren zum Herstellen von Druckformen |
US3620723A (en) * | 1967-05-29 | 1971-11-16 | Ricoh Kk | Electrophotographic copying material containing assistant sensitizers and its manufacturing method |
DE2237680C3 (de) * | 1972-07-31 | 1981-09-10 | Hoechst Ag, 6000 Frankfurt | Elektrophotographisches Aufzeichnungsmaterial |
DE2220408C3 (de) * | 1972-04-26 | 1978-10-26 | Hoechst Ag, 6000 Frankfurt | Elektrophotographisches Aufzeichnungsmaterial und Verfahren zu seiner Herstellung |
US4315981A (en) * | 1972-07-31 | 1982-02-16 | Hoechst Aktiengesellschaft | Organic double layer electrophotographic recording material |
US3997342A (en) * | 1975-10-08 | 1976-12-14 | Eastman Kodak Company | Photoconductive element exhibiting persistent conductivity |
DE2625116C2 (de) * | 1976-06-04 | 1984-01-26 | Gödecke AG, 1000 Berlin | Verfahren zur Herstellung von 4-Hydroxy-aporphin-Derivaten |
DE2726116C3 (de) * | 1977-06-10 | 1980-11-27 | Hoechst Ag, 6000 Frankfurt | Elektrophotographische Druckform |
DE3024772A1 (de) * | 1980-06-30 | 1982-01-28 | Hoechst Ag, 6000 Frankfurt | Elastische, laminierbare lichtempfindliche schicht |
DE3215968A1 (de) * | 1982-04-29 | 1983-11-03 | Basf Ag, 6700 Ludwigshafen | Elektrographische aufzeichnungsmaterialien mit speziellen ladungstraeger transportierenden verbindungen |
-
1983
- 1983-07-05 DE DE3324089A patent/DE3324089A1/de not_active Withdrawn
-
1984
- 1984-06-28 EP EP84107504A patent/EP0133469B1/fr not_active Expired
- 1984-06-28 DE DE8484107504T patent/DE3466091D1/de not_active Expired
- 1984-06-29 US US06/625,970 patent/US4556621A/en not_active Expired - Fee Related
- 1984-07-04 JP JP59137424A patent/JPS6064356A/ja active Granted
Non-Patent Citations (1)
Title |
---|
Römpps Chemie-Lexikon (1979) S.1211, 3803, 644 * |
Also Published As
Publication number | Publication date |
---|---|
JPH0416108B2 (fr) | 1992-03-23 |
DE3466091D1 (en) | 1987-10-15 |
US4556621A (en) | 1985-12-03 |
EP0133469A1 (fr) | 1985-02-27 |
DE3324089A1 (de) | 1985-01-17 |
JPS6064356A (ja) | 1985-04-12 |
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