Laser marking method, laser marking composition and articles having color developing layer made of said composition
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United States of America Patent
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Mar 4, 1997
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N/A
app pub date -
Jul 27, 1994
filing date -
Aug 2, 1993
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Expired
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Abstract
This invention relates to a laser marking method which comprises coating a laser marking composition containing as essential components a color former, a color developer and an inorganic compound having the absorption peak on the infrared absorption spectrum in the region of 900-1,000 cm.sup.-1 on a substrate to form a color developing layer, and irradiating laser light to the color developing layer; the laser marking composition; and articles having a color developing layer made of the laser marking composition. The method of this invention is capable of forming a mark with vivid color development even when the color developing layer is a thin film of less than 5 .mu.m in thickness or when marking is carried out at high speed.
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