Classifications

• • 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
  • G03G17/00—Electrographic processes using patterns other than charge patterns, e.g. an electric conductivity pattern; Processes involving a migration, e.g. photoelectrophoresis, photoelectrosolography; Processes involving a selective transfer, e.g. electrophoto-adhesive processes; Apparatus essentially involving a single such process
  • G03G17/02—Electrographic processes using patterns other than charge patterns, e.g. an electric conductivity pattern; Processes involving a migration, e.g. photoelectrophoresis, photoelectrosolography; Processes involving a selective transfer, e.g. electrophoto-adhesive processes; Apparatus essentially involving a single such process with electrolytic development
• • 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
  • G03G8/00—Layers covering the final reproduction, e.g. for protecting, for writing thereon
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/14—Layer or component removable to expose adhesive
  • Y10T428/1467—Coloring agent
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
  • Y10T428/2813—Heat or solvent activated or sealable
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31725—Of polyamide
  • Y10T428/31739—Nylon type
  • Y10T428/31743—Next to addition polymer from unsaturated monomer[s]
  • Y10T428/31746—Polymer of monoethylenically unsaturated hydrocarbon

Definitions

• This invention relates to an electrophotographic copysheet which can be retouched with water soluble dyestuffs. In one aspect this invention relates to color retouchable electrolytic electrophotographic full color prints. In another aspect this invention relates to a transfer film for providing a retouchable surface on an electrophotographic print.
• One electrophotographic method for providing full color reproductions of a light image utilizes electrolytic electrophotographic techniques. As described in US. 3,010,884 and 3,130,655 successive deposits of subtractive primary colors may be applied to the light exposed surface of an electrolytically developable photoconductive copysheet.
• Particularly suitable color developers include basic nitrogen containing organic compounds which are soluble in an aqueous acidic solution and which are insoluble in water at a pH above 7, as shown in US. 3,172,827.
• Another class of outstanding color developers are the water soluble oniurn cations which decompose electrolytically to form water insoluble compounds, as shown in US. 3,172,826.
• Another object of this invention is to provide a transfer film suitable for application to the surface of an electrophotographic print to provide a retouchable surface.
• a further object of this invention is to provide a method for rendering an electrophotographic print retouchable with water soluble dyestuffs.
• an electrophotographic copysheet having a visible image thereon can be rendered readily retouchable with water soluble dyestuffs without loss of other desirable physical properties if a layer of an essentially colorless methanol soluble synthetic polyamide is bonded to the image bearing copysheet surface.
• a preferred class of methanol soluble polyamides is the nitrogen substituted polyamides, particularly the N-alkoxymethyl polyamides, as described in US. 2,412,993, 2,430,860, 2,430,907 and 2,441,057.
• Other suitable methanol soluble synthetic polyamides include polyamides prepared with the use of certain diamines, e.g. triglycoldiamine, and multicomponent systems, e.g.
• methanol soluble polyamide a polyamide which can exist as at least a percent solution or gel in methanol at 25" C.
• the methanol soluble polyamides provide a retouchable surface for electrophotographic prints without the problems of curl and tackiness encountered in conventional prints. In the form of a retouchable layer having a thickness below about 5 mils they improve color saturation and appearance of the image and serve also to protect the print from abrasion, water spotting and degradation by actinic light.
• the retouchable layer may be prepared by coating the electrophotographic print with a methanol-water solution of the methanol soluble polyamide.
• a transfer film which comprises a transparent layer of methanol soluble polyamide on a releasable or strippable backing.
• Various backing materials with dry releasability from the polyamide may be used, such as a polypropylene film with or without a silica slip agent, polyethylene terephthalate, polypropylene coated paper, polyethylene coated paper, polyethylene film and poly-methyl methacrylate coated paper.
• a suitable essentially colorless adhesive system e.g.
• solvent and/or heat activatable adhesives and pressure sensitive adhesives can be employed.
• a heat activatable adhesive it should generally be capable of activation at a temperature below about C., preferably below 95 C., to avoid degradation of the print.
• the adhesive may be coated directly onto the print surface before application of the retouchable film or it may be carried on the surface of the retouchable film and form an integral component of the transfer film construction. Because of its relative ease in application the adhesive containing transfer film is preferred, generally with a releasable outer layer or liner to protect the adhesive prior to use if a pressure sensitive formulation is utilized.
• the surface of the retouchable film can be varied in texture from glossy to matte by selecting a release backing with the desired finish or by incorporating colloidal silica into the retouchable layer. Frequently it is desirable to include a surfactant into the retouchable layer or into the solution of retouching dyestutf to improve the rate and uniformitv of dye absorption.
• Example 1 A methanol soluble polyamide (B.C.I. nylon 819, N-methoxymethyl polyhexamethylene adipamide, 500- 600% ultimate elongation, 3400-3600 p.s.i. tensile strength, 12.4% water absorption, melting range 140- 148 C., tack point C.) was coated from the following solution onto a 5 mil polypropylene film to provide a dry filrn of one mil thickness.
• B.C.I. nylon 819 N-methoxymethyl polyhexamethylene adipamide, 500- 600% ultimate elongation, 3400-3600 p.s.i. tensile strength, 12.4% water absorption, melting range 140- 148 C., tack point C.
• Example 2 A polymethyl methacrylate coated paper was coated with the following solution to give a dry film thickness of one mil.
• a colorless polyester high strength adhesive (Du Pont 46950 polyester adhesive) was coated onto the po1yamide surface (dry coating thickness of one mil). The resulting construction was laminated by means of heated squeeze rolls at a temperature of about 80 C. to an electrophotographic print. After lamination the methylmethacrylate coated paper was stripped from the print leaving a surface with a pleasing semigloss texture.
• Example 3 A retouchable layer was prepared by coating an electrophotographic print with the following solution:
• a dimensionally stable, electrophotographic print having bonded to its image bearing surface an essentially colorless, methanol soluble, synthetic polyamide layer.
• an electrophotographic print which comprises an essentially colorless, methanol soluble, synthetic polyamide layer bonded to the surface of said print, said layer being retouchable with water soluble dyestuffs.
• a transfer film for rendering an electrophotographic print retouchable with water soluble dyestuffs which comprises an essentially colorless, methanol soluble, synthetic polyamide film releasably bonded to a support sheet.
• the process for rendering an electrophotographic print retouchable with water soluble dyestuffs which comprises (1) contacting the print surface with a transfer film comprising a layer of an essentially colorless, methanol soluble, synthetic polyamide releasably bonded to a support sheet, said support sheet being furthermost from said print surface, 2) bonding said polyamide layer to said print surface, and (3) removing said support sheet from said polyamide layer without breaking the bond between said print surface and said polyamide layer.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Molecular Biology (AREA)
• Photoreceptors In Electrophotography (AREA)
• Printing Plates And Materials Therefor (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24004671

Family Applications (1)

Country Status (4)

Cited By (2)

Citations (1)

• 1965
  • 1965-10-23 US US504055A patent/US3420732A/en not_active Expired - Lifetime
• 1966
  • 1966-08-17 GB GB36918/66A patent/GB1144140A/en not_active Expired
  • 1966-08-30 DE DE19661522665 patent/DE1522665B2/de active Pending
  • 1966-10-21 BE BE688657D patent/BE688657A/xx unknown

Patent Citations (1)

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