Security toner and process using thereof

• US 10,642,179 B2
• Filed: 01/24/2018
• Issued: 05/05/2020
• Est. Priority Date: 01/24/2018
• Status: Active Grant

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Qi, Yu, Young, Eugene F., Li, Shigeng, Cheng, Chieh-Min, Veregin, Richard P. N., Jenson, Laura
• Primary Examiner(s): Vajda, Peter L
• Application Number:
  US15/878,962
• Publication Number:
  US 20190227452A1
• Time in Patent Office: 832 Days
• CPC Class Codes: B41M 3/14 Security printing securities B42D25/29
• CPC Class Codes: C09D 11/40 Ink-sets specially adapted for multi-colour inkjet printing
• CPC Class Codes: G03G 9/08753 Epoxyresins
• CPC Class Codes: G03G 9/0902 Inorganic compounds
• CPC Class Codes: G03G 9/0906 Organic dyes
• CPC Class Codes: G03G 9/0908 Anthracene dyes
• CPC Class Codes: G03G 9/091 Azo dyes
• CPC Class Codes: G03G 9/0912 Indigoid; Diaryl and Triaryl methane; Oxyketone dyes
• CPC Class Codes: G03G 9/0914 Acridine; Azine; Oxazine; Thiazine-;(Xanthene-) dyes
• CPC Class Codes: G03G 9/0916 Quinoline; Polymethine dyes
• CPC Class Codes: G03G 9/0918 Phthalocyanine dyes
• CPC Class Codes: G03G 9/092 Quinacridones
• CPC Class Codes: G03G 9/0926 characterised by physical or chemical properties
• CPC Class Codes: G03G 9/09328 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: G03G 9/09392 Preparation thereof

Abstract

The present disclosure relates to toner compositions containing an IR-taggant, and method of making thereof. The disclosure also relates to method for confirming authenticity of an item.

Claims

1. An emulsion aggregation toner having toner particles comprising a core and a shell, wherein the core comprises

an IR-taggant selected from the group consisting of an inorganic ceramic nanoparticle, an IR-emitting organic dye, and an IR-emitting quantum dot;

wherein the IR-taggant has an emission peak in the wavelength range of about 1000 to 1200 nm;

a crystalline polyester resin; and

an amorphous polyester resin.

2. The toner composition of claim 1 wherein the IR-taggant is present in an amount of from about 0.01 weight percent to 40 weight percent by weight of the toner.

3. The toner composition of claim 1 wherein the IR-taggant has an absorption peak in the wavelength range of about 300 to about 1100 nm.

4. The toner composition of claim 1 wherein the IR-taggant has an average particle size of from about 10 nm to about 800 nm.

5. The toner composition of claim 1 wherein the inorganic ceramic nanoparticle is selected from the group consisting of silicon oxide, yttrium oxide, lithium oxide, ytterbium oxide, and mixtures thereof.

6. The toner composition of claim 1 wherein the IR-emitting organic dye is selected from the group consisting of polymethine dyes, anthraquinone dyes, dithiol metal salt dyes, phthalocyanine dyes, indophenol dyes, aminium dyes, diimonium dyes, azo dyes, cyanine dyes, oxazine dyes, rhodamine dyes, distyryl-boradiazaindacene dyes, sulfoindocyanine succidimidyl esters, acridone dyes, and mixtures thereof.

7. The toner composition of claim 1 wherein the IR-emitting quantum dots is selected from the group consisting of CdTexSe1-x/CdS quantum dots, CuInZnSeS quantum dot, AgInS₂ and mixtures thereof.

8. The toner composition of claim 1 wherein the toner particles having an average particle size of from about 1 to about 15 microns.

9. The toner composition of claim 1, wherein the crystalline polyester resin is selected from the group consisting of poly(ethylene-adipate), poly(propylene-adipate), poly(butylene-adipate), poly(pentylene-adipate), poly(hexylene-adipate), poly(octylene-adipate), poly(ethylene-succinate), poly(propylene-succinate), poly(butylene-succinate), poly(pentylene-succinate), poly(hexylene-succinate), poly(octylene-succinate), poly(ethylene-sebacate), poly(propylene-sebacate), poly(butylene-sebacate), poly(pentylene-sebacate), poly(hexylene-sebacate), poly(octylene-sebacate), poly(decylene-sebacate), poly(decylene-decanoate), poly(ethylene-decanoate), poly(ethylene dodecanoate), poly(hexane-dodecanoate), poly(nonylene-sebacate), poly(nonylene-decanoate), poly(nonane-dodecanoate), copoly(ethylene-fumarate)-copoly(ethylene-sebacate), copoly(ethylene-fumarate)-copoly(ethylene-decanoate), copoly(ethylene-fumarate)-copoly(ethylene-dodecanoate), poly(ethylene-adipamide), poly(propylene-adipamide), poly(butylenes-adipamide), poly(pentylene-adipamide), poly(hexylene-adipamide), poly(octylene-adipamide), poly(ethylene-succinimide), and poly(propylene-sebecamide), poly(ethylene-adipimide), poly(propylene-adipimide), poly(butylene-adipimide), poly(pentylene-adipimide), poly(hexylene-adipimide), poly(octylene-adipimide), poly(ethylene-succinimide), poly(propylene-succinimide), poly(butylene-succinimide), and mixtures thereof.

10. The toner composition of claim 1, wherein the crystalline polyester resin is presented in an amount of from about 5 weight percent to 25 weight percent by weight of the toner.

11. The toner composition of claim 1, wherein the amorphous polyester resin is selected from the group consisting of propoxylated bisphenol A fumarate resin, poly(propoxylated bisphenol co-fumarate), poly(ethoxylated bisphenol co-fumarate), poly(butyloxylated bisphenol co-fumarate), poly(co-propoxylated bisphenol co-ethoxylated bisphenol co-fumarate), poly( 1,2 -propylene fumarate), poly(propoxylated bisphenol co-maleate), poly(ethoxylated bisphenol co-maleate), poly(butyloxylated bisphenol co-maleate), poly(co-propoxylated bisphenol co-ethoxylated bisphenol co-maleate), poly( 1,2 -propylene maleate), poly(propoxylated bisphenol co-itaconate), poly(ethoxylated bisphenol co-itaconate), poly(butyloxylated bisphenol co-itaconate), poly(co-propoxylated bisphenol co-ethoxylated bisphenol co-itaconate), poly( 1,2 -propylene itaconate), a copoly(propoxylated bisphenol A co-fumarate) -copoly(propoxylated bisphenol A co-terephthalate), a terpoly (propoxylated bisphenol A co-fumarate)-terpoly(propoxylated bisphenol A co-terephthalate)-terpoly-(propoxylated bisphenol A co-dodecylsuccinate), and mixtures thereof.

12. The toner composition of claim 1, wherein the amorphous polyester resin is presented in an amount of from about 20 weight percent to 60 weight percent by weight of the toner.

13. The toner composition of claim 1, wherein the toner composition further comprises a surfactant selected from the group consisting of an anionic surfactant, a nonionic surfactant, and mixtures thereof.

14. The toner composition of claim 1, wherein the toner composition is a dry powder.

15. A method for providing an emulsion aggregation toner for authenticating an item, comprising:

forming an IR-taggant dispersion in water, wherein the emulsion comprises an IR-taggant, a surfactant and a colorant;

mixing the IR-taggant dispersion with a resin dispersion, wherein the resin dispersion comprises a crystalline polyester resin and an amorphous polyester resin to form a latex emulsion;

aggregating the latex emulsion to form toner particle cores;

forming a shell over the toner particle cores to form toner particles;

coalescing the toner particles; and

cooling the toner particles;

wherein the IR-taggant is selected from the group consisting of an inorganic ceramic nanoparticle, an IR-emitting organic dye, and an IR-emitting quantum dot;

further wherein the IR-taggant has an emission peak in the wavelength range of about 1000 to 1200 nm.

16. The method of claim 15, wherein the weight ratio of the surfactant to the colorant is from about 0.5:

100 to about 8;

100.

17. A method for confirming authenticity of an item, comprising:

using an emulsion aggregation toner for use in a printing apparatus to form text or image on a substrate, wherein the emulsion aggregation toner comprises;

an IR-taggant is selected from the group consisting of an inorganic ceramic nanoparticle, an IR-emitting organic dye, and an IR-emitting quantum dot;

wherein the IR-taggant has an emission peak in the wavelength range of about 1000 to 1200 nm;

a crystalline polyester resin; and

an amorphous polyester resin;

exposing the formed text or image on the substrate to infrared light;

detecting the IR-emitting feature upon exposure to the infrared light.

18. The method of claim 17 wherein the inorganic ceramic nanoparticle is selected from the group consisting of yttrium oxide, lithium oxide, ytterbium oxide, and mixtures thereof.