Authentication process

• US 5,385,803 A
• Filed: 01/04/1993
• Issued: 01/31/1995
• Est. Priority Date: 01/04/1993
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Duff, James M., Hecht, David L., Goodbrand, H. Bruce
• Primary Examiner(s): GOODROW, JOHN L
• Application Number:
  US08/000,073
• Time in Patent Office: 757 Days
• Field of Search: 430/110, 430/109, 430/106, 430/138, 430/10
• US Class Current: 430/138
• CPC Class Codes: G03G 9/0926 characterised by physical or chemical properties
• CPC Class Codes: G03G 9/093 Encapsulated toner particles
• CPC Class Codes: G03G 9/09378 Non-macromolecular organic compounds

Abstract

A process for the authentication of documents which comprises generating developed documents in an electophotographic apparatus, or in a laser printer with an encapsulated toner comprised of a core comprised of polymer, an optional pigment, and an infrared emitting component, and thereover a polymeric shell; and subjecting the document to an infrared reader whereby the infrared component is detected spectroscopically.

Claims

1. A process for the authentication of documents consisting essentially of generating developed documents in an electrophotographic apparatus, or in a laser printer with an encapsulated toner comprised of a core comprised of polymer, an optional pigment, and an infrared emitting component, and thereover a polymeric shell;

and subjecting the document to an infrared reader whereby the infrared component is detected spectroscopically.

2. A process in accordance with claim 1 wherein the infrared component is selected from the group consisting of carbocyanines, dicarbocyanines, tricarbocyanines, tetracarbocyanines and pentacarbocyanines.

3. A process in accordance with claim 1 wherein the infrared component is present in an amount of from about 0.01 to about 2 weight percent.

4. A process in accordance with claim 1 wherein the core polymer is a styrene acrylate, a styrene methacrylate, a styrene-butadiene or a polyester.

5. A process in accordance with claim 1 wherein the pigment is cyan, magenta, red, yellow, green, brown, blue or mixtures thereof.

6. A process in accordance with claim 1 in which the toner is unpigmented and substantially invisible to the naked eye.

7. A process in accordance with claim 1 wherein the shell is comprised of a polymer prepared by interfacial polymerization.

8. A process in accordance with claim 1 wherein the core polymer is derived from the polymerization of addition monomers selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate, pentyl acrylate, pentyl methacrylate, hexyl acrylate, hexyl methacrylate, heptyl acrylate, heptyl methacrylate, octyl acrylate, octyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, lauryl acrylate, lauryl methacrylate, stearyl acrylate, stearyl methacrylate, benzyl acrylate, benzyl methacrylate, ethoxypropyl acrylate, ethoxypropyl methacrylate, methylbutyl acrylate, methylbutyl methacrylate, ethylhexyl acrylate, ethylhexyl methacrylate, methoxybutyl acrylate, methoxybutyl methacrylate, cyanobutyl acrylate, cyanobutyl methacrylate, tolyl acrylate, tolyl methacrylate, styrene, and substituted styrenes.

9. A process in accordance with claim 1 wherein the toner contains surface additives.

10. A process in accordance with claim 9 wherein the surface additives are metal salts, metal salts of fatty acids, or colloidal silicas.

11. A process in accordance with claim 9 wherein the surface additives are present in an amount of from about 0.1 to about 5 weight percent.

12. A process for avoiding the copying of documents consisting essentially of generating said documents entirely or in selected areas with the encapsulated toner of claim 1, and thereafter scanning the reflected light from the document whereby there is detected spectroscopically the infrared emitting fluoresce component, which component absorbs visible light.

13. A process in accordance with claim 12 wherein the documents are tickets, identification badges, passes, or negotiable securities.

15. A process in accordance with claim 1 wherein the pigment is magnetite or cyan, yellow, magenta, or mixtures thereof.

16. A process in accordance with claim 2 wherein the infrared component is 3,3'"'"'-diethylthiatricarbocyanine, 5,5'"'"'-dichloro-11-diphenylamino-3,3'"'"'-diethyl- 10, 12'"'"'-ethylene-thiatricarbocyanine perchlorate, anhydro-11-(4-ethoxycarbonyl-1-piperazinyl)-10, 12-ethylene3,3,3'"'"', 3'"'"'-tetraethyl- 1,1 '"'"'-di(3-sulopropyl)-4,5,4'"'"', 5'"'"'-dibenzoindotricarbocyanine hydroxide, triethylammonium salt, fluorescing phthalocyanine dyes or fluorescing pigments.

17. A process in accordance with claim 1 wherein the infrared component emits light in the wavelength range from about 700 to about 1,500 nanometers.

18. A process in accordance with claim 1 in which the infrared emitting component is introduced as a component of the encapsulated toner core composition prior to the encapsulation thereof.

19. A process in accordance with claim 1 wherein the infrared emitting component is introduced into the toner by the surface treatment thereof.

20. A process in accordance with claim 2 wherein magnesium phthalocyanine, azine dyes and chlorophylls are selected as the infrared component.

22. A process in accordance with claim 1 wherein said infrared emitting component is selected from the group consisting of 3,3'"'"'-diethylthiatricarbocyanine, 5,5'"'"'-dichloro- 11-diphenylamino-3,3'"'"'-diethyl-10,12'"'"'-ethylene-thiatricarbocyanine perchlorate, and anhydro-11-(4-ethoxycarbonyl- 1-piperazinyl)-10, 12-ethylene-3,3,3'"'"',3'"'"'-tetraethyl-1,1'"'"'-di(3-sulopropyl)-4,5,4'"'"', 5'"'"'-dibenzoindo-tricarbocyanine hydroxide.

23. A process in accordance with claim 1 wherein the infrared component is present in an amount of from between about 0.001 and about 5 weight percent.

14. A process for determining the authenticity of documents which comprises generating documents in an electrophotographic apparatus, wherein latent images are initially formed followed by development with an encapsulated toner comprised of a core comprised of a polymer, pigment particles, and an infrared emitting dye selected from the group consisting of 3,3'"'"'-diethylthiatricarbocyanine, 5,5'"'"'-dichloro-11-diphenylamino-3,3'"'"'-diethyl- 10, 12'"'"'-ethylene-thiatricarbocyanine perchlorate, and anhydro-11-(4-ethoxycarbonyl-1-piperazinyl)-10,12-ethylene-3,3,3'"'"', 3'"'"'-tetraethyl- 1,1 '"'"'-di(3-sulopropyl)-4,5,4'"'"',5'"'"'-dibenzoindotricarbocyanine hydroxide, and thereover a polymeric shell;

transferring the images developed to a supporting substrate, and fusing the images thereto; and

subjecting the documents formed to an infrared reader whereby the infrared dye component is detected by measuring the emitted infrared light from the toned area.

24. A process in accordance with claim 14 wherein the infrared emitting dye is present in an amount of from about 0.01 to about 2 weight percent.

21. A process for the authentication of documents consisting essentially of generating developed documents with an encapsulated toner comprised of a core comprised of polymer, a pigment and an infrared emitting component, and thereover a polymeric shell;

and subjecting the document to an infrared reader.