Laser engraving methods and compositions, and articles having laser engraving thereon
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United States of America Patent
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Apr 19, 2011
Grant Date -
May 5, 2005
app pub date -
Sep 14, 2004
filing date -
Dec 24, 2001
priority date (Note) -
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Abstract
The invention provides a composition having laser engraving properties, comprising a host material and an effective amount of a laser enhancing additive. The laser enhancing additive comprises a first quantity of least one of copper potassium iodide (CuKI.sub.3) or Copper Iodide (CuI), and a second quantity at least one substance selected from the group consisting of zinc sulfide (ZnS), barium sulfide (BaS), alkyl sulfonate, and thioester. The composition can be engraved with grayscale images by an Nd:Yag laser and can be added to laminates or coatings. The composition can be used during the manufacture of many articles of manufacture, including identification documents.
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