| Production of security printing toner based on the Up-Conversation nano-pigment |
| Paper ID : 1024-UFGNSM-FULL |
| Authors: |
|
maryam ataeefard *1, mahdi Ghahrari2 1No. 55, Vafamanesh St., Lavizan Exit, Sayad Shirazi North HWY, Tehran, Iran 2Department of Nanomaterials and Nano coatings, Institute for color science and technology |
| Abstract: |
| The aim of this work is to produce a composite powder as a security ink for digital electrophotographic printing. NaYF4:Tm/Yb nanoparticles as Anti Stokes Pigments (Up-Converting Pigments) were synthesized by hydrothermal method and incorporated into poly (styrene-co-acrylic acid) using eco-friendly emulsion aggregation (EA) approaches with final application of scrutiny laser printing ink called toner. Toner is a powder mainly composed of polymer and colorant that are used as ink in electrophotographic digital printing. Up-Converting Pigments are luminescent materials which are able to convert near infrared (NIR) light to visible (VIS) light. This effect allows the user to apply unconventional security features. Generally, the excitation wavelength is sharply determined for 980 nm or in some cases 940 nm. In the case of our Anti Stokes Pigments, the emission color can be chosen between red, green and blue. The resultant security toner were printed in a controlled environment [23°C, 50% relative humidity (RH)] using a monochrome laser-jet printer (HP 1100, Laser-jet printer). Particle size analysis, scanning electron microscopy, X-ray diffraction, differential scanning calorimeter, thermal gravimetric and spectrophotometric analysis were used to study the size, shape, morphology, structure, thermal and Up-Converting properties of security toner particles. The results show that the security toner produced by the EA method has appropriate characteristics comparing to an industrial toner. |
| Keywords: |
| printing ink, toner, security ink,Up-Converting Pigments,Anti Stokes Pigments |
| Status : Paper Accepted (Poster Presentation) |
