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Copper salts for laser marking of thermoplastic compositions

  • US 5,489,639 A
  • Filed: 08/18/1994
  • Issued: 02/06/1996
  • Est. Priority Date: 08/18/1994
  • Status: Expired due to Fees
First Claim
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1. A laser markable thermoplastic composition, comprising:

  • (a) at least one thermoplastic resin composition suitable for laser marking; and

    (b) at least one copper salt selected from the group consisting of copper phosphate, copper sulfate, and copper thiocyanate, wherein said copper salt is present in an amount sufficient to cause said laser markable thermoplastic con, position to absorb a laser light outside the visible spectrum such that the portion of said composition which absorbs said laser light has a visibly distinct and separately identifiable color.

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