Ink for laser imaging
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United States of America Patent
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May 30, 2017
Grant Date -
Jun 16, 2016
app pub date -
Jul 30, 2014
filing date -
Jul 30, 2013
priority date (Note) -
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Abstract
In a first aspect, the invention provides an ink formulation comprising: (a) a near infrared absorbing system comprising a compound of the formula M1W1.6O6, wherein M1 is one or more elements selected from the group consisting of H, He, alkali metals such as Li, Na, K, Rb, Cs, alkaline earth metals such as Be, Mg, Ca, Sr, Ba, rare-earth elements, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, AL Ga, in, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Hf, Os, Bi and I, or ammonium; (b) a color change agent; and (c) a binder. The invention also provides alternative ink formulations for laser marking, a method of forming an image using the ink formulations and a substrate coated with the ink formulation of the invention. Ink formulations according to the invention have been found to have good laser imaging efficacy, and an essentially negligible impact on the background color of the coating.
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