Method for producing a marking
AssigneeMerck Patent GmbH
InventorSylke Klein
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method for producing a marking in a coating on a substrate or on the surface of a molding, where the marking represents a negative marking within a luminescent surrounding field and is generated using a laser beam, to a marking produced with the aid of the method, and to the use thereof, in particular for the labeling of products.
Claims20
A method for producing a marking on a surface of a moulding or a coating located on a substrate, each of which comprises luminescent particles, comprising bringing said surface or coating into contact with a laser beam, wherein the particles on area units of the surface or coating which are contacted by the laser beam are changed in such a way that their luminescence capability is destroyed, wherein the luminescent particles are included in a non-luminescent, inorganic matrix, which is in the form of pigments in the moulding or coating, and wherein the inorganic matrix comprises dielectric metal oxides and/or metal oxide hydrates.
A method for producing a marking on a surface of a moulding or a coating located on a substrate, each of which comprises luminescent particles, comprising bringing said surface or coating into contact with a laser beam, wherein the particles on area units of the surface or coating which are contacted by the laser beam are changed in such a way that their luminescence capability is destroyed, wherein the luminescent particles are included in a non-luminescent, inorganic matrix, which is in the form of pigments in the moulding or coating, and wherein at least one of the following is satisfied:
- the inorganic matrix is in the form of a flake-form pigment, or
- the luminescent particles consist of inorganic materials, or
- the luminescent particles are stimulated to luminescence in the UV wavelength region and emit visible light, and said luminescent particles consist of doped or undoped metal oxides, doped metal sulfides, metal selenides, metal oxysulfides of the lanthanides or fluorescent mixed oxides, or of mixtures of two or more thereof, or
- the coating is applied to the substrate in the form of a printing ink and solidified.
Dependencies are inferred from the claim text.