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AssigneesNippon Kayaku Kabushiki Kaisha, Kansai Paint Co., Ltd.
InventorsShoiti Hayashihara, Masaki Shinmoto
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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.
A laser marking composition wherein an inorganic compound has an absorption peak on the infrared absorption spectrum in the region of 900-1,000 cm.sup.-1, containing as essential components a color former, a color developer and aluminum hydroxide as said inorganic compound having said absorption peak on said infrared absorption spectrum in the region of 900-1,000 cm.sup.-1.
A laser marking method in which an inorganic compound is used having an absorption peak on the infrared absorption spectrum in the region of 900-1,000 cm.sup.-1, which method comprises coating a composition containing as essential components a color former, a color developer and aluminum hydroxide as said inorganic compound having said absorption peak on said infrared absorption spectrum in said region of 900-1,000 cm.sup.-1 on a substrate to form a color developing layer, and irradiating laser light to said color developing layer.
An article having a color developing layer made of a laser marking composition wherein an inorganic compound has an absorption peak on the infrared absorption spectrum in the region of 900-1,000 cm.sup.-1, containing as essential components a color former, a color developer and aluminum hydroxide as said inorganic compound having said absorption peak on said infrared absorption spectrum in the region of 900-1,000 cm.sup.-1.
Dependencies are inferred from the claim text.