US3220830A - Method of developing a negative electrostatic latent image - Google Patents
Method of developing a negative electrostatic latent image Download PDFInfo
- Publication number
- US3220830A US3220830A US142022A US14202261A US3220830A US 3220830 A US3220830 A US 3220830A US 142022 A US142022 A US 142022A US 14202261 A US14202261 A US 14202261A US 3220830 A US3220830 A US 3220830A
- Authority
- US
- United States
- Prior art keywords
- coating
- developing
- image
- trichlorotrifluoroethane
- electrostatic latent
- 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
Links
Classifications
-
- 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
- G03G9/12—Developers with toner particles in liquid developer mixtures
- G03G9/125—Developers with toner particles in liquid developer mixtures characterised by the liquid
-
- 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
- G03G9/12—Developers with toner particles in liquid developer mixtures
- G03G9/13—Developers with toner particles in liquid developer mixtures characterised by polymer components
- G03G9/132—Developers with toner particles in liquid developer mixtures characterised by polymer components obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Definitions
- liquid developers have been used for developing electrostatic latent images, the previously known processes and the liquids used have not been suitable for gen: eral use due to infiammability and toxic eilects thereof with resultant danger from fires and danger to the health of the operators.
- One object of the present invention is to provide an electrophotographic method of forming latent images on a conductive base including metallic bases, paper bases and the like and to develop the latent electrostatic image by means of a liquid developer which is usable under widely varying conditions and which is safe to use from the standpoint of fire hazard and from the standpoint of health of the operators.
- Another object of the invention is to provide a practical and rapid method of forming a pattern image on an electrophotographic surface such as a portion of an airplane, automobile part or template coated with an electrophotographic layer.
- Another object is to provide an electrophotographic coating which is readily applicable to a conductive surface where an image is desired and which provides uniform electrophotographic properties to said surface.
- Another object is to provide a liquid developer having toner particles which yield high contrast and which produce line images of fine resolution.
- a conductive base support such as metal, treated paper or the like is provided with an electrophotographic coating which accepts and retains an electrostatic charge.
- the electrostatically charged coating is subjected to a light pattern image which discharges the light struck areas and leaves an electrostatic charge image in the unexposed areas.
- the electrostatic charge image is developed by the deposition of a toner from a halogenated hydrocarbon liquid.
- the image may be fixed in a suitable manner including solvent fixing and thermal fixing.
- the fixed image on its support can be used for a final copy or used as a I printing plate after proper treatment for printing copies by accepted printing methods.
- Example 1 A metal template was made by coating a metal base of cleaned aluminum or magnesium plates with a template lacquer of substantially the following composition:
- Pigment to binder ratio 4:1 Zinc oxide to binder ratio 3:1. Pigment volume concentration (volume of pigment divided by total volume of solids multiplied by 100) 47.7% Density 1.47 grams/cc. at
- 100 cc. of the above grind were diluted to cc. with xylene to a viscosity of 40 to 45 seconds on the viscosity cup as before.
- the lacquer was sprayed onto a support at 35 to 40 pounds per square inch pressure in a well ventilated hood or room. It was found that two passes of the spray were generally suificient to give a dry film thickness of 0.7 to 1.0 mil. Care was exercised to prevent excessive evaporation of the solvent during passage through the air to prevent powdering and to prevent sagging in the coating due to excessively thick coatings.
- the coating was allowed to air dry at room temperatures to remove any residual solvent. It was also found that drying at F. for five minutes would also remove the residual solvent.
- the coated conductive support was charged by exposing the coating to a negative corona discharge for 2 to 5 seconds at 6000 to 8000 volts with the conductive support grounded. Care was taken to avoid overcharging which caused objectionable background and under-charging which caused flashing or streaks.
- the charged coating was exposed through a master to a 100 watt tungsten filament clear bulb at 16 inches for five to ten seconds.
- the tungsten filament lamp was found to be satisfactory but an ultra violet lamp was found to be more efiicient since the zinc oxide is more responsive in the ultra violet region of the spectrum.
- the images were produced both by projection and by contact printing.
- the coated support was placed in a tank containing a liquid developer of the following formula to obtain a positive image of the diapositive transparency:
- the developed image was fixed by applying a dilute solution of resin in Freon TF. Any clear resin soluble in solvents not too active on the .base coating would be satisfactory. Fixing also can be obtained by heating to a suitable temperature to soften the resin in the developer toner or the resin in the coating. Fixing can also be accomplished by means of solvent vapors, transparent pressure-sensitive adhesive sheets or other means to immobilize the toner on the coating.
- Example 2 modified casein 80 Zinc oxide 240 Solvent 320 Ammonia, defoamers, orv wetting agents may be added.
- the composition was prepared in a pebble mill and coated on a conductive base such as an etched aluminum plate.
- the dry coating was sensitized by negative corona discharge (4000 to 8000 volts). Exposure through a negative to actinic light formed a latent electrostatic image capable of development by liquid developer. After developing with liquid developer as in Example 1 and fixing, the plate was put on an offset printing press and used with conventional olfset fountain solution and inks to produce offset copies.
- the polarity of the toner particles was changed by the addition of lecithin as described above. This change of polarity of the toner to a negative charge provided a method for obtaining negative copies of the master and, therefore, the electrophotographic process of the present invention provides a means and method for making positive copies and means and method for making negative copies from the same master.
- positive and negative images can be produced from a given master by the selection of a suitable toner.
- a suitable toner for example, the phenol formaldehyde toner with carbon black produces a positive copy while negative images can be made by the addition of lecithin.
- a method of developing a negative electrostatic latent image on an electrophotographic material resistant to trichlorotrifiuoroethane comprising a conductive support and a layer coated on said support, said layer comprising photoconductive zinc oxide and a binder selected from the group consisting of a polymer of esters of acrylic and methacrylic acids, polyvinyl acetate and modified casein, said method comprising the steps of: treating said material with a liquid developer comprising trichlorotrifluoroethane, rosin-modified phenol-formaldehyde resin and finely divided carbon black which is attracted imagewise to said coating and adheres thereto, and allowing the trichlorotrifluoroethane to evaporate and deposit the carbon black imagewise on said layer.
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US142022A US3220830A (en) | 1961-10-02 | 1961-10-02 | Method of developing a negative electrostatic latent image |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US142022A US3220830A (en) | 1961-10-02 | 1961-10-02 | Method of developing a negative electrostatic latent image |
Publications (1)
Publication Number | Publication Date |
---|---|
US3220830A true US3220830A (en) | 1965-11-30 |
Family
ID=22498244
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US142022A Expired - Lifetime US3220830A (en) | 1961-10-02 | 1961-10-02 | Method of developing a negative electrostatic latent image |
Country Status (1)
Country | Link |
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US (1) | US3220830A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3411937A (en) * | 1965-03-01 | 1968-11-19 | Interchem Corp | Method of liquid electrostatic developing |
US3640751A (en) * | 1967-11-06 | 1972-02-08 | Ricoh Kk | Method for liquid-developing an electrostatic image |
US3653895A (en) * | 1970-03-11 | 1972-04-04 | Crown Zellerbach Corp | Reproduction utilizing a bichargeable photoconductive layer containing zinc oxide and titanium dioxide |
US3864127A (en) * | 1971-08-12 | 1975-02-04 | Fuji Photo Film Co Ltd | Method for preparing ZnO-TiO{HD 2 {B bichargeable electrophotographic material |
JPS5040016B1 (en) * | 1970-12-24 | 1975-12-20 | ||
US3941594A (en) * | 1970-09-09 | 1976-03-02 | Rank Xerox Ltd. | Electrophotographic element with ZnO and TiO2 |
US3971659A (en) * | 1968-12-28 | 1976-07-27 | Xerox Corporation | Color electrophotographic process using photoconductive particles in liquid developer |
JPS5134737B1 (en) * | 1970-05-25 | 1976-09-28 | ||
US4183818A (en) * | 1968-12-28 | 1980-01-15 | Xerox Corporation | Color electrophotographic liquid developer of colored particles and zinc oxide |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2760431A (en) * | 1952-06-19 | 1956-08-28 | Dick Co Ab | Lithographic plates and methods for manufacturing same |
CA565006A (en) * | 1954-12-23 | 1958-10-21 | The Battelle Development Corporation | Tripartite developer for electrostatic images |
US2899335A (en) * | 1956-10-31 | 1959-08-11 | Process for developing electrostatic | |
US2954291A (en) * | 1957-01-04 | 1960-09-27 | Haloid Xerox Inc | Method for preparing a spirit duplicating master |
US2995085A (en) * | 1954-02-23 | 1961-08-08 | Haloid Xerox Inc | Transfer and fixing method |
US3010842A (en) * | 1955-08-29 | 1961-11-28 | Xerox Corp | Development of electrostatic images |
US3038799A (en) * | 1958-01-13 | 1962-06-12 | Commw Of Australia | Method of reversing the image in xerography |
US3058914A (en) * | 1957-10-01 | 1962-10-16 | Commw Of Australia | Non-inflammable liquid developers for electrostatic images |
US3076722A (en) * | 1959-04-29 | 1963-02-05 | Rca Corp | Electrostatic printing |
US3113022A (en) * | 1959-02-26 | 1963-12-03 | Gevaert Photo Prod Nv | Electrophotographic process |
US3150976A (en) * | 1960-02-04 | 1964-09-29 | Rca Corp | Electrostatic printing |
US3155503A (en) * | 1959-02-26 | 1964-11-03 | Gevaert Photo Prod Nv | Electrophotographic material |
-
1961
- 1961-10-02 US US142022A patent/US3220830A/en not_active Expired - Lifetime
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2760431A (en) * | 1952-06-19 | 1956-08-28 | Dick Co Ab | Lithographic plates and methods for manufacturing same |
US2995085A (en) * | 1954-02-23 | 1961-08-08 | Haloid Xerox Inc | Transfer and fixing method |
CA565006A (en) * | 1954-12-23 | 1958-10-21 | The Battelle Development Corporation | Tripartite developer for electrostatic images |
US3010842A (en) * | 1955-08-29 | 1961-11-28 | Xerox Corp | Development of electrostatic images |
US2899335A (en) * | 1956-10-31 | 1959-08-11 | Process for developing electrostatic | |
US2954291A (en) * | 1957-01-04 | 1960-09-27 | Haloid Xerox Inc | Method for preparing a spirit duplicating master |
US3058914A (en) * | 1957-10-01 | 1962-10-16 | Commw Of Australia | Non-inflammable liquid developers for electrostatic images |
US3038799A (en) * | 1958-01-13 | 1962-06-12 | Commw Of Australia | Method of reversing the image in xerography |
US3113022A (en) * | 1959-02-26 | 1963-12-03 | Gevaert Photo Prod Nv | Electrophotographic process |
US3155503A (en) * | 1959-02-26 | 1964-11-03 | Gevaert Photo Prod Nv | Electrophotographic material |
US3076722A (en) * | 1959-04-29 | 1963-02-05 | Rca Corp | Electrostatic printing |
US3150976A (en) * | 1960-02-04 | 1964-09-29 | Rca Corp | Electrostatic printing |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3411937A (en) * | 1965-03-01 | 1968-11-19 | Interchem Corp | Method of liquid electrostatic developing |
US3640751A (en) * | 1967-11-06 | 1972-02-08 | Ricoh Kk | Method for liquid-developing an electrostatic image |
US3770485A (en) * | 1967-11-06 | 1973-11-06 | Ricoh Kk | Method for liquid-developing an electrostatic image |
US3971659A (en) * | 1968-12-28 | 1976-07-27 | Xerox Corporation | Color electrophotographic process using photoconductive particles in liquid developer |
US4183818A (en) * | 1968-12-28 | 1980-01-15 | Xerox Corporation | Color electrophotographic liquid developer of colored particles and zinc oxide |
US3653895A (en) * | 1970-03-11 | 1972-04-04 | Crown Zellerbach Corp | Reproduction utilizing a bichargeable photoconductive layer containing zinc oxide and titanium dioxide |
JPS5134737B1 (en) * | 1970-05-25 | 1976-09-28 | ||
US3941594A (en) * | 1970-09-09 | 1976-03-02 | Rank Xerox Ltd. | Electrophotographic element with ZnO and TiO2 |
JPS5040016B1 (en) * | 1970-12-24 | 1975-12-20 | ||
US3864127A (en) * | 1971-08-12 | 1975-02-04 | Fuji Photo Film Co Ltd | Method for preparing ZnO-TiO{HD 2 {B bichargeable electrophotographic material |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SECURITY NATIONAL BANK, A NATIONAL BANKING ASSOCIA Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808 Effective date: 19820323 Owner name: CHASE MANHATTAN BANK, N.A. THE; A NATIONAL BANKING Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808 Effective date: 19820323 Owner name: CHEMICAL BANK, A BANKING INSTITUTION OF NY. Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808 Effective date: 19820323 Owner name: CONTINENTAL ILLINOIS NATIONAL BANK & TRUST CO., OF Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808 Effective date: 19820323 Owner name: BANK OF CALIFORNIA N.A. THE; A NATIONAL BANKING AS Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808 Effective date: 19820323 Owner name: CHEMICAL BANK, A BANKING INSTITUTION OF, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808 Effective date: 19820323 |