TY - JOUR
T1 - Water-based invisible green flexographic ink for anti-counterfeit applications
AU - Bhagya, R. S.
AU - Sunil, Dhanya
AU - Muthamma, Kashmitha
AU - Shetty, Prakasha
AU - Kulkarni, Suresh D.
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/12
Y1 - 2022/12
N2 - Developing chemical molecules with exceptional features as colorants in security inks for information storage has garnered significant research interest. In the quest of smart fluorescent pigments, a pyrene-based pigment- bis(pyren-1-ylmethylene)ethane-1,2-diamine (PDA), which exhibited mechanochromism feature was synthesized and characterized using spectral techniques. The feebly fluorescent pigment exhibited intense green fluorescence upon grinding, and reverted back to less-emissive state when heated and fumed. With PDA as pigment, the water-based flexographic ink formulation was coated on security paper and printed on boards, security and packaging papers. The printed substrates were invisible under day light and displayed green fluorescence upon excitation under UV light. The ink's gloss, lightfastness, colorimetric values and abrasion resistance suggested that PDA might be used as an invisible fluorescent ink with mechanochromic properties for security printing. An ink-less rewritable paper on which written letters and patterns using pressure can be easily erased upon suitable stimuli was developed showing real-life application in information security.
AB - Developing chemical molecules with exceptional features as colorants in security inks for information storage has garnered significant research interest. In the quest of smart fluorescent pigments, a pyrene-based pigment- bis(pyren-1-ylmethylene)ethane-1,2-diamine (PDA), which exhibited mechanochromism feature was synthesized and characterized using spectral techniques. The feebly fluorescent pigment exhibited intense green fluorescence upon grinding, and reverted back to less-emissive state when heated and fumed. With PDA as pigment, the water-based flexographic ink formulation was coated on security paper and printed on boards, security and packaging papers. The printed substrates were invisible under day light and displayed green fluorescence upon excitation under UV light. The ink's gloss, lightfastness, colorimetric values and abrasion resistance suggested that PDA might be used as an invisible fluorescent ink with mechanochromic properties for security printing. An ink-less rewritable paper on which written letters and patterns using pressure can be easily erased upon suitable stimuli was developed showing real-life application in information security.
UR - http://www.scopus.com/inward/record.url?scp=85139009857&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85139009857&partnerID=8YFLogxK
U2 - 10.1016/j.porgcoat.2022.107212
DO - 10.1016/j.porgcoat.2022.107212
M3 - Article
AN - SCOPUS:85139009857
SN - 0300-9440
VL - 173
JO - Progress in Organic Coatings
JF - Progress in Organic Coatings
M1 - 107212
ER -