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US 5,824,715 AGranted
Marking composition and laser marking method
AssigneeNippon Kayaku Kabushiki Kaisha
InventorsShoiti Hayashihara, Masaru Kudo, Masaki Shinmoto
Life of this patent
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Abstract
A marking composition comprising an energy ray curing resin, a leuco dye and a color developer both of which are low in solubility in toluene, which composition is capable of forming a vivid black color on irradiation with laser beams, and a laser marking method for forming a clear-cut black-colored mark by using the above composition.
Claims8
A marking composition comprising an ultraviolet ray curing resin, a photo-initiator, a leuco dye with low solubility in toluene and a color developer with low solubility in toluene;
- said leuco dye with low solubility in toluene being one whose solubility in toluene at 25.degree. C. is 2 w/v % or below, and said color developer with low solubility in toluene being one whose solubility in toluene at 60.degree. C. is 10,000 ppm or below.
Dependencies are inferred from the claim text.