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Detection of the presence and amount of an external surface additive such as silica upon the surface of a toner is accomplished by treating the external surface additive with a fluorescent material and exposing the toner to ultraviolet light. This permits accurate quality control over the amount of the external surface additive required for the toner. The toner thus includes a binder resin and a colorant, and at least one external surface additive upon the surface of the toner, wherein the at least one external surface additive contains a fluorescent material. The fluorescent material may be a fluorescein dye.

Inventors: William H. Hollenbaugh, Jr., Timothy L. Lincoln, Roger N. Ciccarelli, Thomas R. Pickering, Dwight J. Tshudy, Robin L. Sheppard, Amy L. Stamp
Original Assignee: Xerox Corporation
Current U.S. Classification: 430/108.7
International Classification: G03G 909

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Citations

Cited PatentFiling dateIssue dateOriginal AssigneeTitle
US35900005 Jun 196729 Jun 1971BACKGROUND OF
US42986721 Jun 19783 Nov 1981Xerox CorporationToners containing alkyl pyridinium compounds and their hydrates
US43383904 Dec 19806 Jul 1982Xerox CorporationQuarternary ammonium sulfate or sulfonate charge control agents for electrophotographic developers compatible with viton fuser
US45581089 Oct 198410 Dec 1985Xerox CorporationAqueous suspension polymerization process
US510545121 Jun 199014 Apr 1992Eastman Kodak CompanyElectrographic process utilizing fluorescent toner and filtered detector for generating an electrical image signal
US522746030 Dec 199113 Jul 1993Xerox CorporationCross-linked toner resins
US571429123 Dec 19933 Feb 1998Daniel Marinello
Louis Liang
Angstrom Technologies		System for authenticating printed or reproduced documents

Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US650367710 Jul 20017 Jan 2003Xerox CorporationEmulsion aggregation toner particles coated with negatively chargeable and positively chargeable additives and method of making same
US714280417 Apr 200228 Nov 2006Oki Data CorporationToner, toner cartridge that holds the toner therein, and image forming apparatus into which the toner cartridge is attached
US721748616 Jan 200415 May 2007Seiko Epson CorporationToner and image-forming apparatus using the toner
US789473228 Feb 200822 Feb 2011Lexmark International, Inc.IR fluorescent toner compositions
US797032816 Nov 200728 Jun 2011Xerox CorporationSystem and method for preparing magnetic ink character recognition readable documents
US800219027 May 200523 Aug 2011L-1 Secure Credentialing, Inc.Stability of covert pigments
US806714220 Dec 200729 Nov 2011Xerox CorporationCoating, system and method for conditioning prints

Claims

1. A toner comprising a binder resin and a colorant, and at least one external surface additive upon the surface of the toner, wherein the at least one external surface additive contains a fluorescent material that fluoresces upon exposure to ultraviolet light to permit detection of the at least one external surface additive.

2. The toner according to claim 1, wherein the external surface additive is selected from the group consisting of silica, titania, aluminum oxide and zinc stearate.

3. The toner according to claim 1, wherein the toner includes an external surface additive package containing two different external surface additives of the same class, and one of the two different external surface additives of the same class is the at least one external surface additive containing the fluorescent material.

4. The toner according to claim 1, wherein the fluorescent material is a fluorescent dye.

5. The toner according to claim 4, wherein the fluorescent dye is selected from the group consisting of fluorescein dyes, rhodamine dyes, rosaniline, coumarin dyes, thionine, uranium and uranium-sensitized europium.

6. The toner according to claim 4, wherein the fluorescent dye is a fluorescein dye.

7. The toner according to claim 1, wherein the fluorescent material is present in an amount of from about 0.001 to about 1,000 ppm.

8. A method for detecting the presence and amount of an external surface additive upon a surface of a toner particle, the method comprising

treating the external surface additive with a fluorescent material,
incorporating the external surface additive onto the surface of the toner particle, and
exposing the toner particle to ultraviolet light to cause the fluorescent material to fluoresce and thereby permit the detecting.

9. The method according to claim 8, wherein the external surface additive is selected from the group consisting of silica, titania, aluminum oxide and zinc stearate.

10. The method according to claim 8, wherein the external surface additive is silica.

11. The method according to claim 10, wherein the toner particle further includes an additional silica external surface additive that is not treated with the fluorescent material.

12. The method according to claim 8, wherein the fluorescent material is a fluorescent dye.

13. The method according to claim 12, wherein the fluorescent dye is selected from the group consisting of fluorescein dyes, rhodamine dyes, rosaniline, coumarin dyes, thionine, uranium and uranium-sensitized europium.

14. The method according to claim 12, wherein the fluorescent dye is a fluorescein dye.

15. The method according to claim 8, wherein the treating of the external surface additive with the fluorescent material incorporates an amount of from about 0.001 to about 1,000 ppm by weight of the fluorescent material into the external surface additive.

16. The method according to claim 8, wherein the treating is by mixing the external surface additive with the fluorescent material.

17. The method according to claim 8, wherein the incorporating is by blending the treated external surface additive with the toner particle.