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1. (WO2018081065) SECURITY PRINTING INKS FOR INKJET PRINTERS AND METHOD OF MANUFACTURE

Pub. No.:    WO/2018/081065    International Application No.:    PCT/US2017/058005
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Wed Oct 25 01:59:59 CEST 2017
IPC: C09D 11/30
C09D 11/38
C09D 11/322
G01N 21/64
Applicants: TROY GROUP, INC.
Inventors: CAI, Xiaorong
RILEY, Michael R.
Title: SECURITY PRINTING INKS FOR INKJET PRINTERS AND METHOD OF MANUFACTURE
Abstract:
High security inkjet inks are made my milling two or more functional materials, such as invisible ultraviolet fluorescent dyes or pigments, infrared Anti Stokes upconverting pigments, infrared absorption and fluorescent dyes or pigments and iron oxide magnetic pigments, into a pigment dispersion. A wet media mill is used to mill the pigment dispersion until the average particle size is below 300nm. The dispersion is combined with main components of an inkjet ink, such as deionized water, humectants, surfactants, polymer resin and biocides, to produce the high security inkjet ink.