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US 10,642,179 B2Granted
Security toner and process using thereof
AssigneeXerox Corporation
InventorsYu Qi, Eugene F. Young, Shigeng Li, Chieh-Min Cheng, Richard P. N. Veregin, Laura Jenson
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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.
Claims18
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 more elements
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.
6 more elements
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.
5 more elements
Dependencies are inferred from the claim text.