Low melt color toners with fluorescence agents

• US 8,962,228 B2
• Filed: 03/16/2010
• Issued: 02/24/2015
• Est. Priority Date: 09/19/2008
• Status: Active Grant

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Iftime, Gabriel, Moffat, Karen A., Wosnick, Jordan H., Rotberg, Eric, Vong, Cuong, Veregin, Richard P. N., Kazmaier, Peter M.
• Primary Examiner(s): Huff, Mark F
• Assistant Examiner(s): ALAM, RASHID A
• Application Number:
  US12/724,582
• Publication Number:
  US 20100173239A1
• Time in Patent Office: 1,806 Days
• Field of Search: 430/108.4, 430/108.7, 430/137.14
• US Class Current: 430/107.1
• CPC Class Codes: G03G 9/0806 whereby chemical synthesis of at least one of the toner components takes place
• CPC Class Codes: G03G 9/0821 characterised by physical parameters magnetic parameters G03G9/083
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08795 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
• CPC Class Codes: G03G 9/08797 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature
• CPC Class Codes: G03G 9/0906 Organic dyes
• CPC Class Codes: G03G 9/0926 characterised by physical or chemical properties

Abstract

A low melt or ultra low melt toner includes at least one amorphous polyester of an alkoxylated bisphenol based polyester, a crystalline polyester derived from the reaction of an aliphatic dicarboxylic acid or aromatic dicarboxylic acid with an aliphatic diol, at least one colorant and at least one fluorescence agent. Methods of authentication of the toner, of authentication of documents formed from the toner, of embedding information in documents, and the like are also set forth.

Claims

1. A method of forming an image, comprising:

with a toner set comprised of a plurality of toners, a first toner of the toner set comprised of toner particles comprising at least one amorphous polyester comprised of an alkoxylated bisphenol based polyester, at least one crystalline polyester derived from the reaction of an aliphatic dicarboxylic acid or aromatic dicarboxylic acid with an aliphatic diol, at least one colorant and at least one fluorescence agent, wherein the at least one colorant is a black pigment, the toner set further comprising a black toner free of fluorescence agents, wherein upon exposure to activating energy, the fluorescence agent fluoresces to cause a visible change in the color of a pattern formed in an image by the at least one toner, and wherein an image formed from the toner and under ambient light conditions exhibits a substantially same color and a substantially same gloss as that of an image formed from a same toner but not containing the at least one fluorescence agent when the image formed by the toner containing the at least one fluorescence agent and the image formed by the same toner without the at least one fluorescence agent is formed on a same substrate forming a latent image of a first pattern on a photoreceptor, developing the first pattern with the first toner, and subsequently transferring the developed first pattern to a recording medium, and forming a latent image of a second pattern on a photoreceptor, developing the second pattern with an additional toner different from the first toner, and subsequently transferring the developed second pattern to the recording medium.

2. A method for authentication of a toner set, comprising:

forming a toner comprised of toner particles comprising at least one amorphous polyester comprises a copoly(propoxylated bisphenol A co-fumarate)-copoly(propoxylated bisphenol A co-terephthalate) having a repeating unit of the following formula (11);

3. The method according to claim 2, wherein the intensity of fluorescence of the toner due to an amount of the at least one fluorescence agent in the toner is also known, and the determining includes measuring the intensity of the fluorescence of the toner during exposure to the activating energy and comparing the measured intensity to the known intensity.

4. A method of forming an image, comprising:

with a toner set comprised of a plurality of toners, a first toner of the toner set comprised of toner particles comprising at least one amorphous polyester comprised of an alkoxylated bisphenol based polyester, at least one crystalline polyester derived from the reaction of an aliphatic dicarboxylic acid or aromatic dicarboxylic acid with an aliphatic diol, at least one colorant and at least one fluorescence agent, cyan, yellow and magenta toners free of fluorescence agents, wherein upon exposure to activating energy, the fluorescence agent fluoresces to cause a visible change in the color of a pattern formed in an image by the at least one toner, and wherein an image formed from the toner and under ambient light conditions exhibits a substantially same color and a substantially same gloss as that of an image formed from a same toner but not containing the at least one fluorescence agent when the image formed by the toner containing the at least one fluorescence agent and the image formed by the same toner without the at least one fluorescence agent is formed on a same substrate forming a latent image of a first pattern on a photoreceptor, developing the first pattern with the first toner, and subsequently transferring the developed first pattern to a recording medium, and forming a latent image of a second pattern on a photoreceptor, developing the second pattern with an additional toner different from the first toner, and subsequently transferring the developed second pattern to the recording medium.

5. The method according to claim 4, wherein the first toner and the additional toner exhibit a same color under ambient light, the additional toner differing from the first toner at least in being free of fluorescence agents, and the method further comprises exposing the developed patterns to the activating energy to initiate fluorescence of the fluorescence agent in the first pattern such that the first pattern exhibits a different color from the ambient light color.

6. The method according to claim 4, wherein the first toner and the additional toner exhibit a different color under ambient light, both the first toner and the additional toner contain a fluorescence agent, and the method further comprises exposing the developed patterns to the activating energy to initiate fluorescence of the fluorescence agent in the first and the second pattern such that both patterns exhibit a different color from the respective ambient light colors.

7. The method according to claim 4, wherein the first pattern or the second pattern is comprised of digital information.

8. The method according to claim 7, wherein the digital information is machine readable, and the method further comprises exposing the patterns to the activating energy to initiate fluorescence of the fluorescence agent in the first and/or the second pattern and reading the digital information with a machine during the fluorescence.