Laser marking method and aqueous laser marking composition
AssigneesNippon Kayaku Kabushiki Kaisha, Kansai Paint Co., Ltd.
InventorsShoiti Hayashihara, Masaki Shinmoto
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Abstract
This invention relates to a laser marking method which comprises heating a base article having on its surface a thin film of a laser marking composition containing a color former and a color developer having a melting point of 200.degree. C. or above, and then applying laser light to the thin film. The method of this invention is capable of no-break marking with vivid color development by application of laser light, without causing discoloration of the ground even under a condition of 120.degree. C. or above.
Claims20
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.degree. C. or above, and a laser light absorptive inorganic compound, and
- applying laser light to said thin film.
A laser marking method which comprises the steps of:
- providing a thin film on a surface of a base article, said thin film being made of an aqueous laser marking composition containing a color former having a melting point of 200.degree. C. or above, a color developer having a melting point of 260.degree. C. or above, a laser light absorptive inorganic compound, and water and having been subjected to a heat treatment at 150.degree.-250.degree. C. for 1 minute to 2.5 hours;
- and
- applying laser light to said thin film.
An aqueous laser marking composition comprising a color former having a melting point of 200.degree. C. or above, a color developer having a melting point of 260.degree. C. or above, a laser light absorptive inorganic compound, and water.
An article comprising a structural body having a surface, a thin film that has been subjected to a heat treatment for 1 minute to 2.5 hours applied to said surface of said structural body, said thin film composed of a composition containing a color former, a color developer having a melting point of 200.degree. C. or above, and a laser light absorptive inorganic compound.
A laser marking method which comprises the steps of:
- providing a thin film of a laser marking composition on the surface of a base article, said laser marking composition containing a color former, a color developer having a melting point of 200.degree. C. or above, and a laser light absorptive inorganic compound,
- applying laser light to said thin film, and
- subjecting the third film to a heat treatment for 1 minute to 2.5 hours.
Dependencies are inferred from the claim text.