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Laser marking method and aqueous laser marking composition

  • US 5,691,757 A
  • Filed: 12/12/1994
  • Issued: 11/25/1997
  • Est. Priority Date: 12/22/1993
  • Status: Expired due to Fees
First Claim
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1. A laser marking method which comprises the steps of:

  • providing on a surface of a base article a thin film of a laser marking composition that has been subjected to a heat treatment for 1 minute to 2.5 hours, said laser marking composition containing a color former, a developer having a melting point of 200°

    C. or above, and a laser light absorptive inorganic compound, andapplying laser light to said thin film.

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