US3079253A - Method of electrophotography employing a heat glossing composition - Google Patents

Method of electrophotography employing a heat glossing composition Download PDF

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Publication number
US3079253A
US3079253A US666610A US66661057A US3079253A US 3079253 A US3079253 A US 3079253A US 666610 A US666610 A US 666610A US 66661057 A US66661057 A US 66661057A US 3079253 A US3079253 A US 3079253A
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Prior art keywords
coating
pigment
toluene
vehicle
zinc oxide
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US666610A
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Harold G Greig
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RCA Corp
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RCA Corp
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Priority to BE568750D priority Critical patent/BE568750A/xx
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Priority to US666610A priority patent/US3079253A/en
Priority to GB16221/58A priority patent/GB893333A/en
Priority to FR1208425D priority patent/FR1208425A/fr
Priority to DER23486A priority patent/DE1180147B/de
Priority to CH6079458A priority patent/CH386458A/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/04—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a surface receptive to ink or other liquid
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G11/00—Selection of substances for use as fixing agents
    • 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
    • G03G5/08—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being inorganic
    • G03G5/087—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being inorganic and being incorporated in an organic bonding material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • This invention relates to compositions and recording elements that are prepared with a matte surface finish and which can be converted subsequently to a gloss surface finish solely by heating. Recorded information on the surface of the recording element is ⁇ fixed thereto during the heating step.
  • compositions for recording elements have been previously reported.
  • Such compositions may comprise a particulate pigment suspended in a vehicle.
  • the pigment particles extend irregularly from the surface of the coating, thereby imparting an abrasive quality and matte appearance to the surface.
  • This abrasive quality may be used for recording information thereon as by rubbing a pencil, crayon, stylus, etc. across the surface thereof.
  • it is often desired to tix the recorded information so that further information may be added only with difficulty and so that the recorded information may be removed only with difficulty.
  • Previous processes tix such recorded information by coating with an adhesive or by fusing the information to its support.
  • ⁇ an adhesive generally requires special equipment and additional time and technique for its success. Fusing the information to a support also requires special equipment .and technique, and does not gloss the composition or prevent additional marking from being added subsequently.
  • An object of this invention is to provide improved compositions and recording elements which are prepared with a mat-te surface finish and which can be subsequently converted to a gloss surface finish solely by the application of heat.
  • Another object is to provide improved compositions and recording elements which are adapted to receive information and, solely upon the application of heat, to ix the information already recorded, and to prevent the addition of further information thereto.
  • a further object is to -provide -improved processes for preparing the improved compositions and recording elements of the invention.
  • compositions of the invention comprise generally a particulate pigment, such as zinc oxide, and up to 2O wei-ght percent of a low-melting particulate material, such as calcium stearate, suspended as separate phases in a vehicle therefor.
  • the proportions of pigment, lowmelting material and vehicle are selected to provide a matte surface finish.
  • the recording elements herein may comprise the foregoing composition upon a support, such as aluminum foil or paper.
  • the recordings element herein may also comprise a support coated with a low- .3,079,253 Patented Feb- 25, 1963 melting materia-l which in turn is over-coated with a com. position having a matte surface -tinish comprising a particulate pigment suspended in a vehicle.
  • compositions and recording elements herein which are useful in electrostatic printing preferably comprise a particulate photoconductor, ⁇ such .as zinc oxide having a surface photoconductivity higher than about l0f9 ohmsvl/ square/ watt/cm.2 yat about 3900 A., and up to about l() weight percent of a low-melting particulate material suspended ⁇ as separate phases in an electrically-insulating, film-forming Vehicle.
  • the Irecording elements ⁇ of the invention may be prepared by one of two improved processes.
  • the vehicle is dissolved in a solvent therefor, and the pigment and low-melting material suspended in the solvent solution.
  • the suspension is then coated Ion .a support.
  • the solvent is removed from the coated suspension at temperatures below the glossing temperature of the coating.
  • a support is coated with the low-melting material.
  • the vehicle is dissolved in a solvent therefor and the pigment suspended in the solvent solution.
  • the ⁇ suspension is then overcoated on the low-melting coating. Then the solvent is removed from the overcoating at temperatures below the glossing temperature of the coating.
  • FIGURES y1(Lz), 1(b), and 1(c) are sectional, elevational views of one recording element of the invention 4before rand after lglossing,
  • FlGURE 2 is a sectional, elevational view of another recording element of the invention.
  • FIGURE 3 is a partially-schematic, sectional view of an apparatus for producing a blanket electrostatic charge upon a recording element herein,
  • FIGURE 4 is a partially-sectional, elevational view of an apparatus for projecting light to form a contact image upon the charged recording element of FIGURE 3, and
  • FIGURE 5 is a sectional view of an apparatus for developing an electrostatic image upon the recording element produced in FIGURE 4.
  • the invention herein comprises the addition, as a separate phase of up to 20 weight percent ⁇ of a low-melting material to a composition comprising ⁇ a particulate pigment suspended in a vehicle.
  • the proportions of pigment to vehicle are selected to provide a 4matte finish surface to the composition.
  • the coating can be written upon by abrasion as with a pencil or stylus. And, due to the nature of the Writing, the writing may be erased or otherwise removed or other writing may be added. Due to the presence of the low-melting material, heat applied to 4the composition converts the matte iinish surface to a gloss 'finish surface.
  • This conversion fixes the writing to the surface and renders diflicult the addition Iof further writing and removal of fixed writing.
  • information may be added by transfer from another surface, by conventional printing techniques, or otherwise applied tothe surface of the -improved compositions herein.
  • the solvent is then removed from the coating at temperatures below the glossing temperature of the coating.
  • EXAMPLE 1 An example will illustrate the foregoing type of recording element.
  • a recording element is prepared by coating a paper support with the following suspension:
  • Zinc oxide (Florence Green Seal-8) 120 (2) Calcium stearate 5 (3) Piccopale-lUO resin 38 (4) Toluene 118 (5) Piccolastic A-5 resin 5 (5) Tricresyl phosphate
  • the Piccopale-lGO softening point about 100 C
  • Piccolastic A-5 and tricresyl phosphate are dissolved In the toluene.
  • the calcium stearate is then added and the slurry warmed -to 80 C.
  • the calcium stearate goes into colloidal suspension at about this temperature.
  • the zinc oxide is added after the suspension has cooled and is dispersed by mixing, as in a Waring Blender. This mix.
  • the recording element comprises a support 21 of paper having a coating 23 on one surface thereof of ⁇ a composition of the invention.
  • the coating 23 so produced has a matte finish due to zinc oxide particles 22 which extend irregularly from the surface of the coating.
  • the coating may be marked with a pencil, crayon, metal stylus, coin, or other abrasive means.
  • the particles, left behind may be removed with a rubber eraser or other means. If it ⁇ is desired to tix the markings .to the paper, the paper is placed in a small oven and heated to above 100 C. for about half a minute. Referring to FIGURE 1(b), the zinc oxide particles 22 and the markings (not shown) become submerged and are permanently fixed in the coating.
  • the coating takes on a glossy appearance, loses its abrasive quality, and be comes diiiicult to write upon.
  • the support for the coating composition may be of any suitable material.
  • suitable support materials are metals such as iron, copper, aluminum and silver; cellulosic materials such as paper, cellophane and Wood; and other materials 1as textiles, glass, ceramic or mineral block.
  • the support may be a sheet, web or foil, or may be massive.
  • any inorganic pigment used or usable in the paper coating arts may be used herein.
  • he pigment may be colored or colorless.
  • the pigment preferably should have a melting point higher than that of the vehicle land lowrnelting material.
  • suitable inorganic pigments are titanium dioxide, stannic oxide, zinc sulde, zinc oxide, iron oxide, and cadmium sulfide-zinc sulde fluorescent pigment.
  • the low-melting material may be a material of any composition which (1) has a low-melting point, preferably a sharp melting point between 75 Vand 200 C., (2) preferably produces low viscosity materials upon melting, and (3) hardens to produce a glossy surface.
  • the melting point of the low-melting material is preferably within C. of the softening point of the vehicle. Further, to simplify fabrication the low-melting material should be substantially insoluble in the solvent for the vehicle.
  • the vehicle may be any vehicle ordinarily usable with the pigment selected ⁇ It is preferred that the vehicle has a softening point Within about 100 C. of the melting point of the low-melting material so that, upon heating, the low melting material may pass easily to the surface of the composition. Further, it is preferred that the vehicle be soluble in a solvent in which the low-melting material and the pigment are substantially insoluble.
  • suitable solvents for the mix of Example l are toluene, xylene and ethyl alcohol.
  • Some suitable vehicles are shown in Table III. Y
  • the glossing and fixing operations of the compositions herein may be explained in one or more of the following ways.
  • One explanation is illustrated in FIGURES 1(11) and 1(17).
  • the low-melting material 20 Upon heating, the low-melting material 20 merely melts and oats upon the surface of the balance of the composition submerging the pigment particles 22 of the composition below the surface. Effectively, the low-melting material forms a distinct layer 23a with a gloss surface on top of the balance of the composition 23b. This explanation probably applies to waxes which are not compatible with the vehicle.
  • FIGURES l(a) and 1(0) A second explanation is illustrated in FIGURES l(a) and 1(0).
  • the low-melting Vmaterial 20 melts and dissolves part or all of the Vehicle of the composition thereby increasing the -uid bulk of the coating Z3.
  • the pigment 2.2 then settles in this solution.
  • the solution solidies forming a new coating 23C with a gloss finish surface.
  • one or more of the modifiers may also act as an auxiliary solvent or solute during heating.
  • the low-melting material and the pigment may set up as an oriented thixotropc structure.
  • the thixotropic structure is lost upon heating and the pigment particles settle below the surface of the coatgBy any explanation, the low-melting material preferably has a melting point above room temperature but below about 200 C.
  • the low-melting material should be particulate in the single coating composition and should be a phase separate from either the pigment or the vehicle.
  • phase as employed herein and in the appended claim, is defined to mean a homogeneous, physically distinct portion of matter in a non-homogeneous system. After heating either two or three phases are present.
  • pigment particles extend irregularly from the surface imparting a matte finish and abrasiveness to the surface of the composition before heating. After heating, the pigment particles are completely covered with one or more other ingredients of the composition.
  • the pigment, the low-melting material and the vehicle are selected in such proportions as to provide a matte surface finish before heating and a gloss surface finish after heating.
  • the optimum proportions will vary according to the materials selected and the particle size of the materials.
  • the proportions may be between about 50 and 90 by Weight percent zinc oxide, up to 20 weight percent low-melting material and the balance being composed of the vehicle. The larger the particle size of the pigment, the greater the proportion of pigment that may be used.
  • modifiers may be added to the basic mix to modify the properties thereof. Often the modifier will also function as a vehicle or as a low-melting material. Materials such as tricresyl phosphate or various resins may be added to affect the electrical properties, iiexibility, toughness or plasticity of the composition. Dyes may be added to modify the color or electrical properties of the composition.
  • the vehicle is first dissolved in the solvent. Then the low-melting material and the pigment are suspended in the solvent solution.
  • the solvent is selected such that it will dissolve the vehicle but leave the pigment and the low-melting material substantially unaffected.
  • the suspension is then coated on a support, such as paper, and the solvent removed at temperatures below the glossing temperature of the coatmg.
  • a recording element herein may comprise coating 20a of a low-melting material (with or Without a vehicle) on a support 21 and an overcoating 24 upon the low-melting coating of a composition comprising a pigment suspended in the vehicle. This feature is illustrated in the following example.
  • the resultant recording element has the appearance of and functions in a manner similar to the recording element of Example l.
  • the improved recording elements herein may be used as the photosensitive recording element in an electrostatic printing process such as described by C. I. Young and H. G. Greig in Electrofax--Direct Electrophotographic Printing on Paper, RCA Review, volume l5, No. 4, pages 469 to 484 (December 1954).
  • the foregoing teachings apply.
  • the vehicle should be electricallyinsulating and film-forming.
  • the low-melting material is preferably present in proportions up to about 10 weight percent of the composition.
  • the pigment should be a particulate photoconductor and should be present in proportions between 50 and 90 weight percent of the composition.
  • the Zinc oxide should have a value of surface photoconductivity higher than 10F9 ohms-/ square/ watt/cm?.
  • photoconductivity refers to the difference between the conductivity in the dark and the conductivity of a substance in the light.
  • the adjective surface is used to indicate that substantially all of the light is absorbed within a thin layer at the surface of a measured specimen.
  • ohms-1 is the conventional measure of conductivity.
  • square takes into account the geometry of a measured specimen. Where the area between measurement electrodes is a square, the results are independent of the size of the square.
  • /watt/cm.2 expresses the measurement in per unit brightness of light per unit area illuminated.
  • Test ] A mixture was prepared comprising about 10 milligrams of dry zinc oxide powder and a few drops of an 80% solution of silicone resin in xylene (GE-SR 82, marketed by the General Electric Company, Silicone Products Division, Waterford, N.Y.) diluted with toluene in the ratio 60 grams solution to 105 grams toluene.
  • the mixture was coated on filter paper and dried to produce a dry coating over an area about 0.25 inch in diameter.
  • the dry coating was cooled to about -190 C. and examined in light from a mercury vapor lamp having a maximum output at about 3650 A.
  • the zinc oxides which produce printable coatings produce a lavender or orange luminescence by this test. Other zinc oxides exhibit a green Yor yellow luminescence.
  • Test 2 About 0.25 gram of dry zinc oxide powder was placed in a silica boat. The boat was inserted into a silica tube and the system ilushed with hydrogen gas. The tube and boat were red for about 5 minutes at about 1000 C. in a stagnant hydrogen atmosphere. The boat was cooled in hydrogen to room temperature. The fired zinc oxide was examined in light from a mercury vapor lamp having a maximum output at about 2,650 A. The zinc oxides which produce printable coatings luminesce brightly. Other Zinc oxides luminesce weakly or not at all.
  • VTable lV compiles the results of the two tests on typical commercially-available zinc oxides and indicates the correlation between tliese tests and the printability of the zinc oxides used in the coatings of the invention.
  • the zinc oxides marked G in column 3 may be used to prepare recording elements for electrostatic printing or for nonphotoconducting uses.
  • the zinc oxides marked P may be used for non-photoconducting uses.
  • Examples l to 1l, 13, 14, 16 and 17 describe recording elements of the invention which are useful in electrostatic printing, as by the methods described in Youn and Greig, op. cit.
  • Paper was coated with this mix by conventional paper coating techniques but with drying below the temperature that causes glossing. This matte surface paper glossed in the heat xing step at about C. in a few seconds.
  • EXAMPLE 7 Grams (1) Zinc oxide (Florence Green Seal-8) 120 (2) Carnauba wax (No. 1 yellow) 6 35 (3) Piccopale-100 1 38 (5) Piccolastic A-5 1 5 (5) Tricresyl phosphate 5 (4) Toluene 100 40
  • the Piccopale, Piccolastic and tricresyl phosphate were dissolved in the toluene.
  • the zinc oxide was added and dispersed in the Waring Blendor. The mix was heated to boiling and the carnauba wax added and dissolved. Paper was coated while the mix was still hot. The Wax apparently crystallizes out of solution in a finely-divided phase before the coating sets.
  • the paper had a matte finish and glossed when heated to 180 C. for a few seconds.
  • EXAMPLE 8 50 Grams (1) Zinc oxide (Florence Green Seal-8) 120 (2) Ultracera amber wax1 (Bareco) 5 (3) Piccopale-lOO 1 38 (5) Piccolastic A-5 1 5 55 (5) Tricresyl phosphate 5 (4) Toluene 100 The Piccopale, Piccolastic and tricresyl phosphate were dissolved in the toluene. The zinc oxide was added and dispersed, as in the Waring Blendor. The mix was heated to boiling and the Ultracera Amber Wax (Bareco) added and dissolved. Paper was coated while the mix was still hot. The wax apparently crystallizes out of solution in a finely-divided phase before the coating sets. The paper had a matte nish and glossed upon heating to about 180 C. in a few seconds. i
  • EXAMPLE 9 Grams (1) Zinc oxide (Florence Green Seal-8) 120 70 (2) Petronauba D 1 wax (Bareco) 10 (3) Piccopale-1001 38 (5 Piccolastic A5 1 5 (5) Tricresyl phosphate 5 (4) Toluene 100 75 The Piccopale, Piccolastic and tr-icresyl phosphate were dissolved in the toluene. The zinc oxide was added and dispersed, as in the Waring Blendor. The mix was heated to boiling and the Petronauba D was added and dissolved. Paper was coated while the ymix was still hot. The wax apparently crystallizes out of solution in a iinely-divided phase before the coating sets. The paper had a matte finish and glossed upon heating to about 180 C. in a few seconds.
  • the recording element of Example 1 may be used in an electrostatic printing process according to the following steps.
  • the recording element of Example 1 is placed with the backing 21 upon a grounded metal plate 25 and in darkness, an electrostatic charging device 51 passed over the photoconducting coating 23 to provide an electrostatic charge thereon.
  • the charging device 51 may comprise an array of line wires 53 mounted near the grounded metal plate 25.
  • a source of D.C. voltage is connected between the wires 53 and the grounded plate 2S to provide a negative charge on the Wires with respect to grounded plate 2S.
  • the voltage should be sufficiently high to cause a corona discharge adjacent the wires.
  • the apparatus and process may produce a blanket positivey charge if the polarity of the wires 53 is positive with respect to the grounded plate 25.
  • the next step in the process is to discharge selected areas 'of the charged surface of the recording element in order to produce an electrostatic image thereon.
  • this may be accomplished by placing a photographic transparency 61 upon the charged surface of the coating 23 and exposing to light derived, for example, from a lamp 59 in the manner of conventional contact printing. An exposure of about 1 second from a 100 watt tungsten lamp about 24 inches from the recording element for a normal density photographic transparency hasbeen found'to be adequate.
  • the light image may be produced by any of the ordinary photographic processesasUby-projection,contact, or reflux. Any type of electromagnetic radiation may be used provided a portion thereof falls within the spectral sensitivity of the photoconducting coating 23. In the example, visible blue and ultraviolet light may be used.
  • visible light For other photoconducting strata, visible light, infra-red, ultraviolet or X- rays may be used. Wherever the light strikes the surface of the photoconducting coating 23, the electrostatic charge thereon is reduced or removed. This leaves an electrostatic image or pattern of charges corresponding to the non-illuminated areas of the light image.
  • the electrostatic image may be stored for a time if desired. Ordinarily the next step is to develop the electrostatic image with a finely-divided developer substance such as a finely-divided powder or an ink mist.
  • development of the electrostatic image is preferably accomplished by maintaining the recording element in darkness and passing a developer brush 59 containing a developer powder across the surface of a photoconducting coating 23 bearing the electrostatic image. Areas 27 of developer powder are deposited on those areas of the surface retaining an electrostatic charge.
  • the developer brush comprises a mixture of magnetic carrier particles, for example powdered iron, and the developer powder. The mixture is secured in a magnetic field by a magnet 57 to form a developer brush.
  • a preferred carrier material for the developer mix consists of alcoholized iron, that is, iron particles free fom grease and other alcohol-soluble impurities. These iron particles are preferably relatively small in size, being in their largest dimension about .002" to .008. Satisfactory results are also obtained using a carrier consisting of iron particles of a somewhat wider range of sizes from about .001 to .020.
  • a preferred developer powder may be prepared as follows: A mixture comprising 200 grams of 200 mesh Piccolastic resin 4358 (an elastic thermoplastic resin composed of polymers of styrene, substituted styrene andits homologs), marketed by the Pennsylvania Industrial Company, Clairton, Pa., 12 grams of Carbon Black G, marketed by the Eimer and Amend Co., New York, N.Y.,
  • Piccolastic resin 4358 an elastic thermoplastic resin composed of polymers of styrene, substituted styrene andits homologs
  • the developer powder may be chosen from a large class of material-ls.
  • the developer powder is preferably electrically-charged to aid 4in the development of the electrostatic latent image.
  • the powder may be electricallycharged because the powder (l) is eleotroscopic, or (2) has interacted with other particles with which it is triboelectrically active or (3) has been charged from an electric source such as a corona discharge.
  • suitable developer powders are powdered zinc, powdered copper, carbon, sulfur, pigmented natural and synthetic resinsor mixtures thereof.
  • the developer powder may -be applied tothe electrostatic image in other Ways, for example, it may be dusted on' to -the image, or it may be mixed with ⁇ glass beads, magnetite, or other suitable carrier particles, and the mixture then brought i-nto contact with the-surface of the photoconducting stratum.
  • The'beads serve merely as a temporary carrier, releasing the powder particles upon contact with the charged surface.
  • the type of developer powder described is a positivelycharged powder and will adhere readily to negativelycharged areas of the electrostatic image.
  • the developed areas 4of the image correspond to the non-illuminated portions of the light image.
  • the photoconducting coating 23 is charged positively, and the same steps are carried through as above-described, a reverse image is obtained. If a negatively-charged powder is used in place of -the positivelycharged powder, then a reverse image is obtained in the rst case and a positive image is obtained in the alternative case.
  • the developed image is now fixed to the photoconducting coating. This is easily accomplished with the recording element of the invention.
  • the recording element is converted yto a glossy appearance and the powder image is fixed to the surface threeof as described above.
  • the recording elements herein may also be used in an electrostatic printing process as a heat fixing transfer medium.
  • U. S. Patent No. 2, 297,691 to C. F. Carlson there is described electrostatic printing processes where a powder image of a desired configuration is prepared upon a selenium plate, and the powder image then transferred to a suitable medium and tixed thereon. Adhesives or thermoplastic powders are suggested for xing.
  • the recording elements herein are used as transfer media in the Carlson processes, the powder image need not be of a thermoplastic material. Also, adhesives are unnecessary. Instead, upon transfer of the powder image to a recording element herein, heat is applied glo-ssing the surface and xing the powder image thereon.
  • compositions for recording elements which are prepared with a matte surface iinish and which may be subsequently converted to a glossy linish by the application of heat.
  • the recording elements herein are adapted to -receive information and upon the application of heat, x the information already recorded and prevent the addition of [further linformation thereto.
  • methods for preparing such compositions and methods for preparing the recording elements of the invention have further been described.
  • a method of recording on a coated electrophotographic element having a .matte surface comprising from to 90% by weight of a linelydivided photoconductor suspended in and protruding above the surface of an electrically-insulating, film-forming, thermoplastic vehicle, said coating including 1.2% to 20% by weight of a low-melting material insoluble in said vehicle and having a melting point between about C. and 200 C., said vehicle having a softening point not more than C.
  • said method comprising the steps of: electrophotographically producing a latent electrostatic image on said coating, producing a visible image on said coating by applying thereto a finelydivided developer substance, and heating said coating to a temperature at least equal to the softening point temperature of said vehicle to fix said developer substance to said coating and to convert said matte surface to a gloss sunface.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
US666610A 1957-06-19 1957-06-19 Method of electrophotography employing a heat glossing composition Expired - Lifetime US3079253A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE568750D BE568750A (it) 1957-06-19
US666610A US3079253A (en) 1957-06-19 1957-06-19 Method of electrophotography employing a heat glossing composition
GB16221/58A GB893333A (en) 1957-06-19 1958-05-20 Heat glossing compositions and recording elements
FR1208425D FR1208425A (fr) 1957-06-19 1958-06-11 Compositions susceptibles de devenir brillantes par action de la chaleur et articles d'enregistrement
DER23486A DE1180147B (de) 1957-06-19 1958-06-13 Durch Waermeeinwirkung fixierbarer Aufzeichnungstraeger
CH6079458A CH386458A (de) 1957-06-19 1958-06-19 In der Wärme glänzend werdendes flächenförmiges Material

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BE (1) BE568750A (it)
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GB (1) GB893333A (it)

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US3159483A (en) * 1959-07-14 1964-12-01 Azoplate Corp Process for the preparation of electrophotographic reversed images
US3236647A (en) * 1961-01-05 1966-02-22 Eastman Kodak Co Photographic reproduction process using photopolymerizable resins and new images obtained
US3252835A (en) * 1960-06-01 1966-05-24 Agfa Ag Sensitization of electrophotographic layers
US3259581A (en) * 1961-11-23 1966-07-05 Australia Res Lab Liquid developer for electrostatic images
US3266045A (en) * 1962-09-26 1966-08-09 Ibm Electrophotographic process
US3269839A (en) * 1963-01-04 1966-08-30 Altman Gerald Photographic product for direct viewing and directive imaging
US3320060A (en) * 1963-11-29 1967-05-16 Xerox Corp Deformation image reproduction process utilizing a voltage threshold reducing surfactant
US3322537A (en) * 1963-11-29 1967-05-30 Rca Corp Electrophotographic reproduction process including removal of electroscopic particles from developed electrostatic image
US3340057A (en) * 1962-12-12 1967-09-05 Allied Chem Recording element having polyethylene wax binder and electrostatic printing therewith
US3378370A (en) * 1964-02-06 1968-04-16 Interchem Corp Recording elements for electrostatic printing
US3519819A (en) * 1967-10-09 1970-07-07 Eastman Kodak Co Electrophotographic image receiving element with means to space said element from an image bearing surface during image transfer
US3652271A (en) * 1967-09-01 1972-03-28 Addressograph Multigraph Photoelectrostatic recording member
US3816117A (en) * 1972-09-25 1974-06-11 Eastman Kodak Co Multilayer electrophotographic element containing high contrast and opaque barrier layers
US3859089A (en) * 1968-05-20 1975-01-07 Minnesota Mining & Mfg Multiple copy electrophotographic reproduction process
US3957495A (en) * 1973-05-26 1976-05-18 Pilot Man-Nen-Hitsu Kabushiki Kaisha Solid writing material
US5887234A (en) * 1997-12-17 1999-03-23 Eastman Kodak Company Reproduction apparatus providing selectable image quality and gloss
US10526133B2 (en) * 2017-02-28 2020-01-07 The Procter & Gamble Company Aerosol dispenser having a safety valve
US11814239B2 (en) 2011-05-16 2023-11-14 The Procter & Gamble Company Heating of products in an aerosol dispenser and aerosol dispenser containing such heated products

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US3954466A (en) * 1975-01-02 1976-05-04 Xerox Corporation Electrostatographic photoreceptor
US4376943A (en) * 1981-06-18 1983-03-15 International Business Machines Corporation Record carrier for an electro-erosion printer and method for making same

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US2275957A (en) * 1938-02-11 1942-03-10 Carbide & Carbon Chem Corp Process for coating and laminating materials
US2287348A (en) * 1939-05-11 1942-06-23 West Virginia Pulp & Paper Co Coating paper
US2380126A (en) * 1941-09-11 1945-07-10 Fred A Sturm Marking crayon
US2346624A (en) * 1942-01-10 1944-04-11 Nalco Inc Coating composition, coated article, and method of making same
US2471870A (en) * 1944-11-10 1949-05-31 Standard Oil Dev Co Oil-resistant composition
US2619440A (en) * 1946-02-05 1952-11-25 Emi Ltd Gramophone record
US2554017A (en) * 1946-11-14 1951-05-22 Timefax Corp Electroresponsive recording blank
US2490550A (en) * 1947-08-13 1949-12-06 Du Pont Moistureproof heat sealing composition
US2566516A (en) * 1948-11-16 1951-09-04 Foster Grant Co Inc Plastic marking composition
US2663636A (en) * 1949-05-25 1953-12-22 Haloid Co Electrophotographic plate and method of producing same
US2705682A (en) * 1951-05-11 1955-04-05 American Cyanamid Co Method of coloring cellulosic materials by hot embossing
US2776907A (en) * 1952-07-18 1957-01-08 Battelle Development Corp Method of fixing electrostatic powder image
US2758939A (en) * 1953-12-30 1956-08-14 Rca Corp Electrostatic printing
US2855324A (en) * 1955-04-07 1958-10-07 van dorn
US2875054A (en) * 1956-05-24 1959-02-24 Eastman Kodak Co Preparation of coatings of improved internal strength

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3159483A (en) * 1959-07-14 1964-12-01 Azoplate Corp Process for the preparation of electrophotographic reversed images
US3252835A (en) * 1960-06-01 1966-05-24 Agfa Ag Sensitization of electrophotographic layers
US3236647A (en) * 1961-01-05 1966-02-22 Eastman Kodak Co Photographic reproduction process using photopolymerizable resins and new images obtained
US3259581A (en) * 1961-11-23 1966-07-05 Australia Res Lab Liquid developer for electrostatic images
US3266045A (en) * 1962-09-26 1966-08-09 Ibm Electrophotographic process
US3340057A (en) * 1962-12-12 1967-09-05 Allied Chem Recording element having polyethylene wax binder and electrostatic printing therewith
US3269839A (en) * 1963-01-04 1966-08-30 Altman Gerald Photographic product for direct viewing and directive imaging
US3320060A (en) * 1963-11-29 1967-05-16 Xerox Corp Deformation image reproduction process utilizing a voltage threshold reducing surfactant
US3322537A (en) * 1963-11-29 1967-05-30 Rca Corp Electrophotographic reproduction process including removal of electroscopic particles from developed electrostatic image
US3378370A (en) * 1964-02-06 1968-04-16 Interchem Corp Recording elements for electrostatic printing
US3652271A (en) * 1967-09-01 1972-03-28 Addressograph Multigraph Photoelectrostatic recording member
US3519819A (en) * 1967-10-09 1970-07-07 Eastman Kodak Co Electrophotographic image receiving element with means to space said element from an image bearing surface during image transfer
US3859089A (en) * 1968-05-20 1975-01-07 Minnesota Mining & Mfg Multiple copy electrophotographic reproduction process
US3816117A (en) * 1972-09-25 1974-06-11 Eastman Kodak Co Multilayer electrophotographic element containing high contrast and opaque barrier layers
US3957495A (en) * 1973-05-26 1976-05-18 Pilot Man-Nen-Hitsu Kabushiki Kaisha Solid writing material
US5887234A (en) * 1997-12-17 1999-03-23 Eastman Kodak Company Reproduction apparatus providing selectable image quality and gloss
US11814239B2 (en) 2011-05-16 2023-11-14 The Procter & Gamble Company Heating of products in an aerosol dispenser and aerosol dispenser containing such heated products
US10526133B2 (en) * 2017-02-28 2020-01-07 The Procter & Gamble Company Aerosol dispenser having a safety valve

Also Published As

Publication number Publication date
GB893333A (en) 1962-04-04
CH386458A (de) 1965-01-15
DE1180147B (de) 1964-10-22
FR1208425A (fr) 1960-02-23
BE568750A (it)

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