Importance

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Abstract

A universal or all-purpose laser marking composition for forming satisfactorily dark laser marks on a wide variety of substrates is provided. The marking composition comprises an enhancer of nitrides, carbides, silicides, and combinations thereof. The enhancer may be selected one or more of ferromanganese, ferrosilicon, Fe_xSi_(1-x) where X can range from about 0.005 to 0.995, Fe₅Si₂, MgFeSi, SiC, CaSi, (Co)Mo, MoSi₂, TiSi₂, ZrSi₂, WSi₂, MnSi₂, YSi, Cu₅Si, Ni₂Si, Fe₃C, Fe₇C₃ and Fe₂C, MoC, Mo₂C, Mo₃C₂, YC₂, WC, Al₄C₃, Mg₂C, Mg₂C₃, CaC₂, LaC₂, Ta₄C₃, Fe₂N, Fe₃N, Fe₄N, Fe₇N₃, Fe₁₆N₂, MoN, Mo₂N, W₂N, WN, WN₂, and combinations thereof and combinations thereof. Upon disposing the marking composition on a substrate and exposing the marking composition to laser radiation, the marking composition absorbs the laser radiation, increases in temperature, chemically bonds with the substrate, and when formed on each of a metal, glass, ceramic, stone, and plastic substrates, the mark has a negative ΔL dark contrast value of at least −1 compared to a mark formed by the marking composition without the enhancer.

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First Claim