US3840385A - Method of forming colored copy of an original - Google Patents

Method of forming colored copy of an original Download PDF

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Publication number
US3840385A
US3840385A US00258658A US25865872A US3840385A US 3840385 A US3840385 A US 3840385A US 00258658 A US00258658 A US 00258658A US 25865872 A US25865872 A US 25865872A US 3840385 A US3840385 A US 3840385A
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United States
Prior art keywords
heating
carrier sheet
image
color forming
reactive substance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00258658A
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English (en)
Inventor
S Yoskida
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Ricoh Co Ltd
ITE Imperial Corp
Original Assignee
Ricoh Co Ltd
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Publication of US3840385A publication Critical patent/US3840385A/en
Assigned to I-T-E IMPERIAL CORPORATION A DE CORP reassignment I-T-E IMPERIAL CORPORATION A DE CORP MERGER (SEE DOCUMENT FOR DETAILS). Assignors: AIRMATIC - BECKETT HARCUM INC - THE CHASE SHAWMUT COMPANY COMPONETROL INC - DATAMETRICS INC - EFCO DIE CASTING CORPORATION - GENRE REALTY INC - IMPERIAL EASTMAN CORPORATION - INDUSTRIAL DESIGN INC - RUNDEL COMP, ONENTS INC - TERAC CONTROLS INC
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    • 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
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/22—Processes involving a combination of more than one step according to groups G03G13/02 - G03G13/20
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/09—Colouring agents for toner particles
    • G03G9/0926—Colouring agents for toner particles characterised by physical or chemical properties
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/09—Colouring agents for toner particles
    • G03G9/0928—Compounds capable to generate colouring agents by chemical reaction

Definitions

  • the diazo copying method is presently widely used because of its advantages with respect to cost and supe rior quality of the colored image. When compared with the silver salt method or electrostatic photography, however, it is inferior in photosensitivity. As a result it is not possible to produce copies from a duplex print or an opaque single-side. print.
  • Electrostatic photography is widely employed as a means for producing copies from a duplex print.
  • the method comprises the steps of imparting an electrostatic latent image onto a photoconductive layer of a sensitive material on a support sheet such as paper, metal and the like byelectrically charging and selectively leaking the charge by exposure to direct or reflected light from an original toproducea latent image; causing toner particles charged with electricity having the polarity opposite to that of said latent image to adhere to the latent image to form a toner image; and fixing the toner image.
  • This method is defective in that the photoconductive material is expensive and the toner which is a coloring matter in itself leaves stains wherever it is scattered. In the case of wetdevelopment, there are various problems arising from incomplete elimination of the solvent from the copies.
  • the present invention provides a simple and economical copying method which is capable of substantially alleviating the foregoing defects of the conventional methods and is particularly suited for the purpose of obtaining copies continuously.
  • the present invention comprises the steps of:
  • the color forming set will include only two chemicals, although three or more may be involved. One or more may be on the fine particles or on the carrier sheet.
  • the compound or compounds on the particles will hereinafter be referred to as reactive substance A, and the compound or compounds on the carrier sheet as reactive substance B.
  • the photoconductive substrate may be any of those substrates presently employed in the art.
  • the carrier sheet may be paper, polymer, metallic foil and the like.
  • Reactive substance A reacts with reactive substance B to produce a colored product duplicating the original. It appears that reaction takes place by melting or fusing the substances in contact with each other or by sublimation.
  • a feature of the present invention is the discovery that fine particles of porous silica or alumina can be deposited on a latent image and will adhere thereto whether the electric charge of the latent image is positive or negative.
  • the fine particles of silica or alumina with reactive substance A adsorbed thereon are brought into contact with an electrostatic latent image charged with positive or negative electricity, the particles are deposited electrostatically on the latent image and will adhere thereto.
  • this latent image with said particles adhering thereto is brought into pressure contact with a copying or carrier sheet coated with reactive substance B and heated while in such contact, suitably with a roller having a surface temperature of from about 50 to C, the reactive substance A shifts onto said copying sheet to give rise to a reaction in the contact region, whereby a copied color image can be formed.
  • a particular advantage of the process is that the copied image thus obtained, because of its having been formed by reaction between reactive substance A and reactive substance B, does not take the form of an embossed image rising on a flat surface like the toner image to be formed in the electrostatic photography.
  • the accompanying drawing is a diagrammatic representation of one embodiment of the present invention, wherein: 1 denotes a sensitive material for use in electrostatic photography provided with the photoconductive layer 12, 2 denotes a corona discharger, 3 denotes a light source, 4 denotes a microfilm carrying an image 41, 5 denotes a fine powder of silica or alumina having adsorbed thereon a reactive substance A, 13 denotes an electrostatic latent image, 6 denotes a copying sheet provided with a layer 62 containing a reactive substance B, 14 denotes a toner-adhering image, and 63 denotes a copied image.
  • the numeral reference 1 denotes a sensitive material for use in electrostatic photography comprising a support 11 and a photoconductive layer 12, 2 denotes a corona discharger, 3 denotes a light source, 4 denotes a microfilm carrying an image 41, '5 denotes a fine powder of silica or alumina with adsorbed reactive substance A, 13 denotes an electrostatic latent image, 6 denotes a copying sheet comprising a support 61 and a layer 62 comprising the reactive substance B, 14 denotes a toner-adhering image resulting from the adhesion of the fine powder to the latent image 13, 7 and 7' denote rollers for the purpose of bringing the sensitive material 1 into contact with the copying sheet 6 with theapplication of pressure, and 63 denotes a copied image.
  • Roller 7 is heated to the selected temperature.
  • the photoconductive layer side 12 of the sensitive materiall for use in electrostatic photography is charged by means of the corona discharger 2.
  • an electrostatic latent image 13 is formed on the charged surface which corresponds to the image 4 of the original.
  • the fine powder of silica or alumina 5 with adsorbed reactive substance A is spread on the surface utilizing, for instance, the cascade method.
  • the powder forms a toner image 14 on the latent image-carrying surface regardless of the polarity of the electrostatic latent image.
  • the fine powder of silica or alumina utilized in the present invention typically will have a grain size of from about 0.1 to 500 p. preferably 1 to 200 p. in order to obtain optimum effects. With grain size appreciably smaller, the particles tend to adhere to non-image areas resulting in a stained background at the time of transfer to a copying sheet.
  • Reactive substance A adsorbed to the silica or alumina, and reactive substance B to be coated on the copying sheet include, for example, the compounds listed below:
  • Reactive substance B Developing color (a) Crystal violet lactone (b) dianisidine base (0) 4-nitro-O-anisidine (d) Rhodamine lactone (e) gallic acid (f) monoethanol amine (g) 2,3-dihydroxy naphthalene (h) 8-amino-l-naphthol- 5.7,-disulfonic acid 2,3-dihydroxy naphthalene do. do.
  • the roller 7 is provided with a heater of standard design not shown in the drawings.
  • the sensitive material having the toner image 14 on its photoconductive layer 12 can serve repeatedly as a transfer master until reactive substance A becomes exhausted. This is a particular advantage of this invention which makes possible the production of multiple images in a continuous manner from one master sheet. Additionally, the used sensitive material may be reused after wiping with a revolving brush or the like and applying infrared rays to cure the fatigue condition which arises from exposure of the photoconductive layer. This too is an important advantage of the invention since the same photoconductive substrate can be used repeatedly for copying. The advantages markedly reduce the cost of producing copied images particularly when compared to the photoconductive zinc oxide process.
  • the fine powders of silica or alumina with adsorbed reactive substance A for use in the present invention are different from the conventional toner particles to be made to adhere to electrostatic latent images electrically. They are further characterized in that they do not give rise to the so-called edging effect which is a serious problem in electrostatic photography. Accordingly, it can produce images having a continuously gradated
  • This list is not limiting, but merely exemplary.
  • a solution of the reactive substance B or this solution mixed with some resinous binder and/or stabilizer and other additives as occasion demands is applied to a suitable support in a conventional manner.
  • substance B is such a one as can be melted orsublimated by heating, it may be employed as the reative substance A to be adsorbed to silica or alumina.
  • the substance may be interchangeable.
  • (p) can serve as the reactive substance A
  • (g) and (h) serve as the reactive substance B respectively.
  • the reactive substance A is substantially non-volatile as long as it is adsorbed to the fine powder of silica or alumina, so that even a prolonged storage will not deprive it of its desired effect.
  • the ratio of the fine powder of silica or alumina to the reactive substance A to be applied may vary within wide limits depending for example, on the grain size of silica or alumina, the molecular weight and transferability of the reactive substance B, etc. Normally it will be from about 1 to 10 percent by weight of the reactive substance A based on 10 percent by weight of the fine powder of silica or alumina.
  • the photoconductive member for use in electrostatic photography to be employed in the present invention can be provided by applying photoconductors such as zinc oxide, titanium oxide, cadmium oxide, selenium, polymer of N-vinyl carbazole, in a suitable binder to a substrate in the usual manner.
  • photoconductors such as zinc oxide, titanium oxide, cadmium oxide, selenium, polymer of N-vinyl carbazole
  • EXAMPLE 1 silicone resin liquid (solid matter: 6071) lUUg (under the trade name of KR-2l l, manufactured by Shinetsu Kagaku K.K.) toluene 100g zinc oxide powder 80g Rose Bengale (0.1%) l0ce
  • the above mixture was made into a coating liquid for use in forming a photoconductive layer through 24 hours kneading and pulverization in a ball-mill. This coating liquid was then uniformly spread over an aluminum foil so as to obtain a coating film p. thick when dried, whereby a sensitive plate for use in electrostatic photography was prepared.
  • a white, dry fine powder of silica adsorbed Crystal Violet lactone was prepared by thoroughly mixing 40 g of a fine silica powder having a mean grain size of 40' (a manufacture of SHIONOGI SEIYAKU K.K.; trade name: CARPLEX) with 10 g of diphenyl chloride solution containing 1 percent of Crystal Violet lactone.
  • the thus obtained powder was sprinkled on the latent image-carrying surface of said sensitive plate by cascade method, whereby a transfer master was prepared.
  • another coating liquid according to the following pre scription was prepared, and by applying this liquid to a white stencil paperweighing 60g/m and drying thereafter, a copying sheet was prepared.
  • a coating liquid for use in forming a photoconductive layer according to the above prescription was applied to a tracing paper weighing g/m whereby a sensitive paper for use in electrostatic photography was obtained. Subsequently, latent image was formed on this sensitive paper by imparting negative electricity and exposing. Meanwhile, a white, dry fine powder of silica adsorbed 2,3-dihydroxy naphthalene was prepared by thoroughly mixing 10g of a fine silica powder having a mean grain size of So (a manufacture of FUJI- DAVIDSON K.K.; trade name: Silloid 79) with 10g of a solution containing cc of water, 20cc of ethylene glycol and 10g of 2,3-dihydroxy naphthalene.
  • EXAMPLE 3 amorphous selenium powder 100g ethyl cellulose (a manufacture of KOKUSAN KAGAKU K.K.) 30g dioetyl phosphate (plasticizer) 5g ethyl acetate 300g toluene 50g 7 A mixture according to the above prescription was made into a coating liquid for use in forming a photo-' EXAMPLE 4 Three varieties of powder developers were prepared as follow:
  • Developer A for use in cyan-coloring fine alumina powder having a mean grain of it
  • u a manufacture of MIZUSAWA KAGAKU KKK; trade name: NEOBEAD
  • Developer B for use in yellow-coloring fine alumina powder having a mean grain size of p.
  • a copying method comprising the steps of:
  • a particle image comprising fine porous particles of silica or alumina having a mean grain size from about 0.1 to 500, and having adsorbed thereon at least one first member of a color forming set of chemical compounds;
  • a method according to claim 1, wherein the mean grain size of said fine particles is from about 1 to 200 3.
  • step of depositing comprises cascading the fine particles over the photoconductive layer.
  • heating-temperature is from about 50 to C.
  • the first member is selected from the group consisting of (a) Crystal Violet lactone, (b) dianisidine base, (c) 4-nitro- O-anisidine, (d) Rhodamine lactone, (e) gallic acid, (f) monoethanol amine, (g) 2,3-dihydroxy naphthalene, (h) 8-amino-l-naphthol-5,7,-disulfonic acid, (i) 4- methoxy-l-naphthol, (j) l-phenyl-3-carboxy pyrazolone, (k) phloroglucinol and (l) 3-hydroxy-l-phenol;
  • the second member is selected from the group consisting of (m) attapulgite clay, (n) ammonium methavandate, (0) copper sulfate, (p) 2-diazo-4-chloro-lphenol, (q) 4-diazo dipropyl aniline and (r) 4-di

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US00258658A 1971-06-04 1972-06-01 Method of forming colored copy of an original Expired - Lifetime US3840385A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46038619A JPS5123180B1 (enrdf_load_stackoverflow) 1971-06-04 1971-06-04

Publications (1)

Publication Number Publication Date
US3840385A true US3840385A (en) 1974-10-08

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US00258658A Expired - Lifetime US3840385A (en) 1971-06-04 1972-06-01 Method of forming colored copy of an original

Country Status (5)

Country Link
US (1) US3840385A (enrdf_load_stackoverflow)
JP (1) JPS5123180B1 (enrdf_load_stackoverflow)
DE (1) DE2226292C3 (enrdf_load_stackoverflow)
GB (1) GB1386019A (enrdf_load_stackoverflow)
NL (1) NL169374C (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933488A (en) * 1972-05-17 1976-01-20 Fuji Photo Film Co., Ltd. Information display method
US4681828A (en) * 1986-09-02 1987-07-21 Eastman Kodak Company Method of chemical electrographic image amplification using chemically active toner particles
US4724026A (en) * 1985-02-05 1988-02-09 Omnicrom Systems Corporation Process for selective transfer of metallic foils to xerographic images
US4868049A (en) * 1985-02-05 1989-09-19 Omnicrom Systems Limited Selective metallic transfer foils for xerographic images
US5087495A (en) * 1985-02-05 1992-02-11 Esselte Letraset Limited Assembly for use in a process for making selective transfers to xerographic images on sheet material
US5750462A (en) * 1991-04-15 1998-05-12 Nocopi Technologies, Inc. Latent image printing process and apparatus and substrate therefor
EP0866377A1 (en) * 1997-03-19 1998-09-23 Fujitsu Limited Method and apparatus for forming image

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK437383A (da) * 1982-09-24 1984-03-25 Coulter Systems Corp Opak kontakttrykkopi og fremgangsmaade til dens fremstilling
DK437483A (da) * 1982-09-24 1984-03-25 Coulter Systems Corp Trykkeplade til relieftryk og fremgangsmaade til dens fremstilling

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933488A (en) * 1972-05-17 1976-01-20 Fuji Photo Film Co., Ltd. Information display method
US4724026A (en) * 1985-02-05 1988-02-09 Omnicrom Systems Corporation Process for selective transfer of metallic foils to xerographic images
US4868049A (en) * 1985-02-05 1989-09-19 Omnicrom Systems Limited Selective metallic transfer foils for xerographic images
US5087495A (en) * 1985-02-05 1992-02-11 Esselte Letraset Limited Assembly for use in a process for making selective transfers to xerographic images on sheet material
US4681828A (en) * 1986-09-02 1987-07-21 Eastman Kodak Company Method of chemical electrographic image amplification using chemically active toner particles
US5750462A (en) * 1991-04-15 1998-05-12 Nocopi Technologies, Inc. Latent image printing process and apparatus and substrate therefor
EP0866377A1 (en) * 1997-03-19 1998-09-23 Fujitsu Limited Method and apparatus for forming image
US6004707A (en) * 1997-03-19 1999-12-21 Fujitsu Limited Method and apparatus for forming image using an improved liquid developing technique

Also Published As

Publication number Publication date
NL7207427A (enrdf_load_stackoverflow) 1972-12-06
NL169374B (nl) 1982-02-01
DE2226292B2 (de) 1978-02-02
GB1386019A (en) 1975-03-05
JPS5123180B1 (enrdf_load_stackoverflow) 1976-07-15
DE2226292C3 (de) 1978-09-28
DE2226292A1 (de) 1973-01-04
NL169374C (nl) 1982-07-01

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Owner name: I-T-E IMPERIAL CORPORATION A DE CORP

Free format text: MERGER;ASSIGNORS:AIRMATIC - BECKETT HARCUM INC - THE CHASE SHAWMUT COMPANY COMPONETROL INC - DATAMETRICS INC - EFCO DIE CASTING CORPORATION - GENRE REALTY INC - IMPERIAL EASTMAN CORPORATION - INDUSTRIAL DESIGN INC - RUNDEL COMP;ONENTS INC - TERAC CONTROLS INC;REEL/FRAME:004167/0712

Effective date: 19761130