US3915703A - Photoconductive composition and element employing a sensitizer and a light filtering substance - Google Patents

Photoconductive composition and element employing a sensitizer and a light filtering substance Download PDF

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US3915703A
US3915703A US382338A US38233873A US3915703A US 3915703 A US3915703 A US 3915703A US 382338 A US382338 A US 382338A US 38233873 A US38233873 A US 38233873A US 3915703 A US3915703 A US 3915703A
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light
photoconductive
photoconductor
sensitive
sensitizer
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Yaski Mori
Hirosada Morishita
Nobuhiko Shito
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Hitachi Ltd
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Hitachi Ltd
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    • 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
    • G03G5/12—Recording members for multicolour processes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/01—Electrographic processes using a charge pattern for multicoloured copies
    • 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
    • G03G5/09—Sensitisors or activators, e.g. dyestuffs

Definitions

  • a photoconductive material comprises a photoconductor, a sensitizer and a light filtering substance such as a dye or pigment which itself displays substantially no sensitizing action, but is capable of absorbing light of an undesired wave length, whereby the wave length region to which the photoconductor is sensitive is controlled by filter effect of the light filtering substance so that the photoconductor is rendered sensitive only to light of a specific wave length region.
  • a light filtering substance such as a dye or pigment which itself displays substantially no sensitizing action, but is capable of absorbing light of an undesired wave length, whereby the wave length region to which the photoconductor is sensitive is controlled by filter effect of the light filtering substance so that the photoconductor is rendered sensitive only to light of a specific wave length region.
  • Electrophotography is usually accomplished by charging a photoconductor layer formed on an electroconductive support in a high electric field and then exposing the layer to a pattern of light through an original. Those portions of the photoconductor layer which are exposed to the light becomes electroconductive, whereby the charge is earthed and leaks away. Images are usually obtained by developing the latent image by allowing toners to stick to those portions of the photoconductor layer in which the charge remains.
  • a color image can be obtained by forming said photoconductor layer with three kinds of mosaics which are respectively sensitive to spectra of three regions of red, green and blue light.
  • mosaics which are sensitive to spectra of different regions can be produced by coating different dyes to insensitized photoconductor layer by silk screen in such a manner that the different dyes do not overlap each other.
  • mosaics which are respectively sensitive to spectra of different regions can be produced by charging insensitized photoconductor layer, exposing the layer through a mosaic screen pattern and developing the latent image with a developer comprising a sensitizing dye.
  • the photoconductor layer itself has selective sensitivity to spectra in the wave length region to which the photoconductor has sensitivity increased by sensitizing dye is controlled in order to reproduce color close to that of original. Therefore, even such dyes as having excellent sensitizing efficiency cannot be used when the wave length region to which the photoconductor has sensitivity is wider or narrower than desired or is biased or shifted.
  • the dye-transfer type photoconductor layer (according to said type, after an image is formed, the dye is transferred to another recording material) containing a large amount of a dye, the spectrum absorbed by the dye is apt to become wider and simultaneously the wave length region to which the photoconductor is sensitive also becomes wider.
  • maximum wave length to which the photoconductor is sensitive also shifts, the wave length region slips from the purpose and as the result, it is impossible to reproduce color close to that of an original.
  • An object of the present invention is to provide a photoconductive material for color electrophotography for obtaining a color image having color close to that of original.
  • Further object of the present invention is to provide a photoconductive material for electrophotography having selective photosensitivity to spectra of specific regions without causing reduction of sensitizing action of sensitizer.
  • the object of the present invention is to provide photoconductive material for electrophotography which have selective photosensitivity to spectra of three basic lights, namely, red, green and blue, respectively.
  • Still further object of the present invention is to provide three kinds of photoconductive materials for color electrophotography which comprise a photoconductive material sensitive only to the spectra of red, a photoconductive material sensitive only to the spectrum of green and a photoconductive material sensitive only to the specturm of blue lights.
  • FIG. 1 is the cross-sectional view of a recording medium for electrophotography of the present invention.
  • FIGS. 2, 4 and 6 are spectrograms of the conventional photoconductors for green, red and blue lights.
  • FIGS. 3, 5 and 7 are spectrograms of the photoconductor of the present invention and correspond to FIGS. 2, 4 and 6, respectively.
  • FIG. 8 shows a rough sketch of an optical system of color reproduction.
  • FIGS. 9, l0 and 11 are spectrograms of photoconductor obtained in Example l0 hereinafter mentioned.
  • FIG. 12 is a rough sketch of the photoconductor in mosaic pattern in which 1 l is an insulating support, 12 is a photoconductive layer and 13 is mosaics and C means cyan, M means magenta and Y means yellow.
  • the present invention provides a photoconductive material for color electrophography which has selective sensitivity to spectra of three basic lights of red, green and blue, respectively by controlling wave length region to which the photoconductor layer on electroconductive layer is sensitive. That is, according to the present invention, a sensitizer and a light filtering substance selected from the group of dyes and pigments are added to the photoconductor layer so that there is provided a photoconductive material for color electrophotography utilizing the filter effect obtained by light filtering effect of the specific dye or pigment.
  • the wave length region to which the photoconductive material of the present invention is sensitive is controlled depending upon the kind of the light filtering substance and thus the photoconductive material has sensitivities to spectra of specific regions. This is because the photosensitivity of the photoconductor significantly decreases at about the maximum light absorption wave length of the dye or pigment added as the light filtering substance and no effect is given at the wave lengths which are not absorbed in a large amount by the dye or pigment. That is, the dyes and pigments display the same effect as filter does.
  • the filter effect of the dyes and pigments is considered to be exhibited due to the following reason.
  • the sensitizer contained in the photoconductor layer absorbs the light of the specific wave length to transmit the energy to the photoconductor, which is then excited thereby to exhibit conductivity.
  • the dye or pigment having substantially no sensitizing action but having only absorption of the light is added to the photoconductor, such the dye or pigment does not transmit the energy to the photoconductor.
  • sensitivity of the photoconductive material with respect to the light absorbed by the dye or pigment will markedly decrease.
  • the present invention skilfully utilizes such filter effect of the dye and pigment to control region of wave length to which the photoconductive material is sensitive and to make the photoconductive material sensitiveto the spectra of specific wave length regions.
  • the amount of light absorbed by the light filtering substance is preferably 10 times the amount of light absorbed by the sensitizer. Therefore, the larger the amount of the light filtering substance is, the higher the effect is. However, when the amount is too large, the wave length region to which the photoconductive material is sensitive is unnecessarily limited and, in addition thereto the photoconductor itself becomes brittle. Therefore, too much addition of the dye and pigment is not desired.
  • the photoconductive material for electrophotography according to the present invention may be applied as a photoconductive layer 3 on support 1 through conductive layer 2 to form a recording medium as shown in FIG. 1.
  • support 1 may also serve as electroconductive layer 2 by imparting electroconductivity to the support.
  • photoconductor known inorganic photoconductive materials such as selenium, zinc oxide, titanium oxide, cadmium sulfide, etc. can be used.
  • organic photoconductors such as aromatic or heterocyclic vinyl polymers including poly-N vinyl carbazole, polyvinylanthracene, poly-9-(p-vinylphenyl) anthracene, poly-9-anthroic acid vinyl ester can also be used.
  • the known sensitizers may be used, e.g., Patent blue (C.I. 42015), Victoria blue (C.I. 44045), Nile blue (C.I. 51180), methylene blue (C.I. 52015), Erioglaucine (C.I. 42045), etc. may be used as red color sensitizer; Pyronine B (C.I. 45010), Phloxine B (C.I. 45410), Methylene Violet (C.I. 50205), Rhodamine B (C.I. 45440), Rhodamine 6G (C.I. 45160), etc.
  • Patent blue C.I. 42015
  • Victoria blue C.I. 44045
  • Nile blue C.I. 51180
  • methylene blue C.I. 52015
  • Erioglaucine C.I. 42045
  • red color sensitizer e.g., Pyronine B (C.I. 45010), Phloxine B (C.I. 45410), Methylene Violet
  • green color sensitizer may be used as green color sensitizer; and 3-carboxymethyl-5-3-ethyl-2(3)- benzothiazolylidene rhodamine-triethylamine salt, auramine (C.I. 41000), Setoflavine T (C.I. 49005), Acridine Yellow (C.I. 46025), etc. may be used as blue color sensitizer.
  • One or more of these sensitizers depending on the spectra are added to the photoconductor in an amount of 0003- parts by weight per 100 parts by weight of the photoconductor to attain sensitization.
  • the light filtering substance selected from the group of dyes and pigments which are added for controlling the wave length region to which the photoconductor has sensitivity must show effective light absorbing action in such an amount as giving no adverse effects on the photoconductor layer. It should be noted, however, that some dyes have high sensitizing action and these cannot be used as the light filtering substance in the present invention. Therefore the dyes for controlling the wave length region are those which have substantially no sensitizing action to the photoconductor. Examples of these pigments which satisfy the above requirements are as follows:
  • Direct colors such as Quinoline Yellow P (CI- 47035), Direct Fast Yellow A (Cl- 300), Direct Fast Yellow A (CI-40000), Primuline (CI-49000), Benzo Orange RS (Cl-22920), Direct Orange GG (CI- 23375), Direct Orange R (Cl-22130), Direct Coupling Orange (CI-23370), Sirius Supra Orange 3R (CI- 40265), Direct Bordeaux B (CI-22150), Congo Red (Cl-22120), Direct Violet N (Cl-22570), Sirius Supra Violet BL (Cl-29125), Benzo Blue BS (CI-23710), Sirius Supra Blue F3R (Cl-27925), Sirius Blue 6G (CI- 34230), Benzo Viscose Blue RL (CI-23150), Direct Green G (Cl-30315);
  • Acids colors such as Acid Fast Red B (Cl-14680), Chrome Red BG (Cl-27200), Acid Blue B (Cl-50315), Cyananthrol R (CI-62085), Fast Navy Blue (CI- 13390), Acid Cyanine 5R (CI-26400), Wool Fast Green B (CI-2044), Acid Orange (CI-15510), Cytonine Y (Cl-13090), Sunset Yellow (Cl-15985), Acid Brown G (CI-20170);
  • Mordant colors such as Chrome Yellow G (Cl-14010) Chrome Red B (Cl18760) Alizarine Blue S (CI-67415) Chrome Violet B (Cl-17290) Chrome Green F (Cl-17225);
  • Sulphur colors such as Sulphur Orange (Cl-53105) Sulphur Blue V (Cl-53235) Sulphur Blue RC (Cl-53440) Sulphur Brown G (CI-53020); Vat colors such as Threne Red (CI-67000) Threne Olive (Cl-69525) 3 5 Threne Orange RRTS (Cl-59705) Threne Marine Blue R (CI-70500); and Oil colors such as Oil Blue G (CI-61525) Oil Brown BB (Cl-12020),
  • yellowish and orange ones are used for filtering the light having smaller wave lengths than green light.
  • Green, blue and violet ones are used for filtering the light having larger wave length than green light.
  • red dyes or pigments listed above are added in order to filter the light having the smaller wave length than red light, so that the photoconductive material becomes sensitive only to red light.
  • orange dyes or pigments listed above are added in order to filter the light having the larger wave length than blue light, so that the photoconductive material becomes sensitive substantially only to blue light.
  • red, green and blue lights in the present invention is made by the wave length of the lights. That is, red light has a wave length larger than 600 mu; green light has a wave length of 500 to 590 mu; and blue light has a wave length smaller than 500 mp..
  • the amount of at least one of said pigments and dyes is preferably 5-30 parts by weight per 100 parts by weight of the photoconductor. Although the amount is EXAMPLE 1 A mixture having the following compositions was prepared in a ball mill.
  • Photoconductive zinc oxide produced by Tokyo Seiren K.K.
  • Silicone resin KR 214 produced by Shinetsu Chemical Co., Ltd.
  • Toluene 100 parts by weight 100 parts by weight 80 parts by weight
  • Five parts of 0.2 solution of Pyronine B (CI. 45010) in methanol was added dropwise to said mixture while stirring to adsorb it to the photoconductor. Then, I parts of Pyronine B was further added and a mixture was again prepared ina ball mill.
  • a recording medium shown in FIG. 1 was prepared and was negatively charged at 6 kV. Then, this was exposed through a color original containing network by a photographic enlarger at F 5.6 from a light source of I50 W tungsten lamp from a height of 30 cm for 3 seconds. Thereafter, the exposed recording medium was developed with a reversal toner (N-P toner produced by Konishiroku K.K.) and fixed by heating it at 80C for about 3 seconds to obtain a negative toner image.
  • N-P toner produced by Konishiroku K.K.
  • a gelatin coated paper was immersed in a mixed liquid of 30 parts of ethanol and 1 part of dimethylformamide and immediately withdrawn from the liquid.
  • the negative toner image was pressed onto the paper to cause transfer of Pyronine B to obtain an excellent positive magneta image.
  • the Pyrazolone Orange did not dissolve out into the solvent which was used for transfer and the image showed a good light absorption characteristic as magenta color.
  • a photoconductive material having the following composition was prepared in the same manner as in Example l.
  • Photoconductive zinc oxide 100 parts Silicone resin (KR 214 produced by Shinetsu Chemical Co., Ltd.) 100 parts Erioglaucine (CI. 42045) 10 parts Toluene parts Dimethylformamide 10 parts Watchung Red (C.I. 15865) 12 parts
  • a spectrogram as shown in FIG. 5 was obtained with respect to a recording medium prepared by using the above photoconductive material.
  • a spectrogram in case of containing no Watchung Red is shown in FIG. 4.
  • the photoconductor had the sensitive region to the light of 500 -680 III/J. while addition of Watchung Red resulted in shift of the sensitive region to 600-700 mg.
  • Example 2 The procedure of Example 2 was repeated except that Erioglaucine was replaced by Auramine (CI. 41000) and Watchung Red was replaced by Phthalocyanine Blue (CI. 74160).
  • the spectrograms in case of containing no phthalocyanine Blue and in case of containing it are shown in FIGS. 6 and 7, respectively. As is clear from comparison of these diagrams, the sensitive region to 400-530 mp. was shifted to 400-500 mu.
  • EXAMPLE 4 The recording papers utilizing the photoconductive materials of the present invention sensitive to cyan, magenta and yellow colors which were each prepared in Examples 1, 2 and 3 were separately charged and were respectively and simultaneously exposed through a color original which was equally divided into three parts by a simple optical system comprising two half mirrors 4 and 5 and one mirror 6 as shown in FIG. 8. Thus exposed papers were simultaneously subjected to reversal development and fixation and thereafter the images were transferred to one transfer paper. In this case, solvent was applied to the recording paper. The obtained color images were clear and color reproduction was excellent. Since only the dye was transferred to the transferring paper and pigment was not contained, these recording papers were especially advantageous for color reproduction of mixed color portion.
  • color images were prepared from three recording papers which was sensitive to cyan, magenta and yellow colors, but did not contain the dyes of the present invention capable of controlling the wave length region.
  • prepared images were not good in reproduction of blue color and were not so clear as a whole as compared with those obtained using the dyes as the light filtering substance.
  • EXAMPLE A photoconductive material was prepared in accordance with the same manner as in Example 1 except that Quinoline Yellow (C.l. 47035) was substituted for Pyrazolone Orange. This photoconductive material was sensitive to spectrum of 490-590 mu.
  • EXAMPLE 6 A photoconductive material was prepared in the same manner as Example 1 except that 5 parts of Pyrazolone Orange was replaced with Sirius Supra Orange (C.l. 40235). This photoconductive material was sensitive to spectrum of 500-590 mu.
  • EXAMPLE 7 A photoconductive material was prepared in the same manner as in Example 1 except that 5 parts of Pyrazolone Orange was replaced with 4 parts of Sulphur Orange (C.l. 53105). The resultant photoconductive material layer was sensitive to a spectrum of 495 590 EXAMPLE 8 Polyvinyl carbazol 100 parts 0.5 7: Ethanolic solution of Crystal Violet (C.l. 42555) 2 parts Toluene 1.000 parts The above components were agitated until a homogeneous solution was obtained. To the resultant solution was added dropwise 5 parts of 1 ethanolic solution of Congo Red (C.l. 22120) and they were agitated until a homogeneous solution was obtained. The resultant solution was coated on an aluminum plate by an applicator so that thickness of film was 5 p" The resultant photoconductive material was sensitive to a spectrum of 600-700 mp.
  • the photoconductive materials prepared in the above Examples 5-8 could be used for the conventional dry powder transfer process.
  • EXAMPLE 9 The photoconductive materials having the compositions as in Examples 1, 2 and 3 which contained the pigments as the light filtering substance were printed three times in the order of cyan, magenta and yellow sensitive compositions in mosaic pattern of an intersecting angle of 60 and of 50 lines/inch by means of relief printing so that the compositions did not overlap with each other.
  • the printed matter was charged, color-exposed, subjected to reversal toner development and fixed. Thereafter, the image was transferred to a transferring material to obtain a good color image. This process comprises one time exposure, one time development and one time transfer and hence this is very simple and easy process.
  • EXAMPLE 10 A mixture comprising the following components and sensitive to the whole region of white light was prepared.
  • Photoconductive zinc oxide 100 parts Silicone resin (KR 214 produced -Continued 100 parts 40 parts
  • To the mixture were added dropwise 5 parts of 2 methanolic solution of Bromophenol Blue and 5 parts of 2 solution of dimethylamino benzylidene rhodanine in methylcellosolve while stirring.
  • Three batches of this mixture were prepared, to which 5 parts of Malachite Green (C.l. 42000) and 3 parts of Acid Yellow 23, (C.l. 19140); 5 parts of Acid Red 80 (C.l. 68215); and 5 parts of Acid Blue 45 (C.l. 63010) were added, respectively and each of these three mixtures was further agitated for 4 to 5 hours.
  • said photoconductive compositions were printed by the relief printing in mosaic pattern of the three colors to obtain one photosensitive plate. After charging the plate, this was exposed through a color image and developed with Xerox 914 toner (produced by Xerox Co., Ltd) and then fixed. A polyethylene terephthalate film having a thickness of 200p. on which gelatin was coated in a thickness of 3 1. onto said fixed mosaic plate for 30-60 seconds and the gelatin layer was sufficiently swelled with dimethylformamide, and then the film was gently removed. Color of the mosaic was transferred to the portion to which no toner sticked and the portion to which toner sticked was colored in bluish black due to the dye contained in the toner.
  • Xerox 914 toner produced by Xerox Co., Ltd
  • a photoconductive mixture sensitive to light of a limited region of the spectrum comprising a photoconductor, at least one sensitizer dye sensitive to light in a broader region of the spectrum than said limited region, said broader region including said limited region, and at least one dyestuff or pigment absorbing light in said broader region except for light in said limited region whereby undesired sensitizing of said photoconductor by light outside said limited region is prevented, said mixture containing 5 to 30 parts by weight of said at least one dyestuff or pigment and 0.003 to 10 parts by weight of said at least one sensitizer dye based on 100 parts by weight of said photoconductor.
  • a photoconductive material according to claim 1, wherein the photoconductor is selected from the group consisting of selenium, zinc oxide, titanium oxide and cadmium sulfide.
  • a photoconductive material according to claim 1, wherein the photoconductor is an organic polymer selected from the group consisting of an aromatic and heterocyclic vinyl polymers.
  • a photoconductive element comprising three kinds of homogeneous mixtures, each being regularly arranged in mosaic pattern on an electroconductive support, said homogeneous mixtures including the following three photoconductive compositions:
  • a first photoconductive composition comprising a photoconductor sensitive to the visible light; a sensitizing amount of a sensitizer capable of absorbing green light for enhancing sensitivity of said first photoconductive composition with respect to said green light; and a light filtering substance insensitive to said visible light and capable of absorbing light other than the green light, whereby said first photoconductive composition is rendered sensitive only to said green light;
  • a second photoconductive composition comprising a photoconductor sensitive to the visible light; a sensitizing amount of a sensitizer capable of absorbing red light for enhancing sensitivity of said second photoconductive composition with respect to said red light; and a light filtering substance insensitive to said visible light and capable of absorbing light other than the red light, whereby said second photoconductive composition is rendered sensitive only to said red light; and
  • a third photoconductive composition comprising a photoconductor sensitive to the visible light; a sensitizing amount of a sensitizer capable of absorbing blue light for enhancing sensitivity of said third photoconductive composition with respect to said blue light; and a light filtering substance insensitive to said visible light and capable of absorbing light other than the blue light, whereby said third photoconductive composition is rendered sensitive only to said blue light.
  • each photoconductive composition is a dyestuff or pigment.
  • a photoconductive element according to claim 10 wherein amount of the light filtering substance added to each photoconductive composition is 5 30 parts by weight per parts by weight of the photoconductor.
  • each photoconductive composition is a dyestuff or pigment.
  • An electrophotographic recording material for making multicolored images comprising a mosaic-likedivided photoconductive film having at least one photoconductor, at least two sensitizer dyes, and at least two dyestuffs or pigments, wherein each individual section of the mosaic is sensitive to light of a limited region of the spectrum, each section of the mosaic containing a sensitizer dye sensitive to light in a broader region of the spectrum that in the corresponding limited region, said broader region including said corresponding limited region, and a dyestuff or pigment absorbing light in said broader region except for light in said corresponding limited region whereby undesired sensitizing of the photoconductor in each section of the mosaic by light outside of the corresponding limited region is prevented.

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4794063A (en) * 1985-10-23 1988-12-27 Konishiroku Photo Industry Co., Ltd. Photoreceptor for electrophography, method for the production thereof and method of the image formation thereby
US4980255A (en) * 1988-04-01 1990-12-25 Fuji Electric Co., Ltd. Electrophotographic photoreceptor composition
US5240797A (en) * 1988-04-30 1993-08-31 Seiko Epson Corporation Thin film device and method of manufacture
US5242558A (en) * 1988-04-30 1993-09-07 Seiko Epson Corporation Method for forming a thin film device
US5395678A (en) * 1988-04-30 1995-03-07 Seiko Epson Corporation Thin film color filter for liquid crystal display
US5399450A (en) * 1989-04-28 1995-03-21 Seiko Epson Corporation Method of preparation of a color filter by electrolytic deposition of a polymer material on a previously deposited pigment

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US3060019A (en) * 1958-07-22 1962-10-23 Rca Corp Color electrophotography
US3147699A (en) * 1960-08-04 1964-09-08 Polaroid Corp Color printing process
US3212887A (en) * 1961-04-07 1965-10-19 Minnesota Mining & Mfg Laterally disposed coterminously adjacent multicolor area containing graphic reproduction receptor and electrophotographic process of using same
US3226307A (en) * 1960-01-05 1965-12-28 Sony Corp Multicolor picture film
US3329590A (en) * 1961-04-07 1967-07-04 Minnesota Mining & Mfg Electrolytic development of a subtractive color-forming photoconductive member
US3556783A (en) * 1966-04-01 1971-01-19 Xerox Corp Color manifold imaging process
US3630729A (en) * 1969-06-25 1971-12-28 Dick Co Ab Electrophotographic multicolor copy process employing solubilizable dyes
US3672887A (en) * 1970-08-17 1972-06-27 Xerox Corp Electrophotographic process for multicolor reproduction
US3748125A (en) * 1970-12-09 1973-07-24 Ilford Ltd Color electrophotography using toners of the repellent type

Patent Citations (9)

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Publication number Priority date Publication date Assignee Title
US3060019A (en) * 1958-07-22 1962-10-23 Rca Corp Color electrophotography
US3226307A (en) * 1960-01-05 1965-12-28 Sony Corp Multicolor picture film
US3147699A (en) * 1960-08-04 1964-09-08 Polaroid Corp Color printing process
US3212887A (en) * 1961-04-07 1965-10-19 Minnesota Mining & Mfg Laterally disposed coterminously adjacent multicolor area containing graphic reproduction receptor and electrophotographic process of using same
US3329590A (en) * 1961-04-07 1967-07-04 Minnesota Mining & Mfg Electrolytic development of a subtractive color-forming photoconductive member
US3556783A (en) * 1966-04-01 1971-01-19 Xerox Corp Color manifold imaging process
US3630729A (en) * 1969-06-25 1971-12-28 Dick Co Ab Electrophotographic multicolor copy process employing solubilizable dyes
US3672887A (en) * 1970-08-17 1972-06-27 Xerox Corp Electrophotographic process for multicolor reproduction
US3748125A (en) * 1970-12-09 1973-07-24 Ilford Ltd Color electrophotography using toners of the repellent type

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4794063A (en) * 1985-10-23 1988-12-27 Konishiroku Photo Industry Co., Ltd. Photoreceptor for electrophography, method for the production thereof and method of the image formation thereby
US4980255A (en) * 1988-04-01 1990-12-25 Fuji Electric Co., Ltd. Electrophotographic photoreceptor composition
US5240797A (en) * 1988-04-30 1993-08-31 Seiko Epson Corporation Thin film device and method of manufacture
US5242558A (en) * 1988-04-30 1993-09-07 Seiko Epson Corporation Method for forming a thin film device
US5395678A (en) * 1988-04-30 1995-03-07 Seiko Epson Corporation Thin film color filter for liquid crystal display
US5399450A (en) * 1989-04-28 1995-03-21 Seiko Epson Corporation Method of preparation of a color filter by electrolytic deposition of a polymer material on a previously deposited pigment
US5554466A (en) * 1989-04-28 1996-09-10 Seiko Epson Corporation Color filter and method of preparation

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DE2339810B2 (de) 1976-01-15
JPS4936339A (is") 1974-04-04

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