Patent ID: 8541492

Claim:
A pigment for laser-writable thermoplastic materials in the form of at least one particulate, light-sensitive compound that absorbs in a range of a laser light wavelength and which under the influence of the laser light results in a color change in a plastic material in which the pigment is present, wherein the pigment comprises at least one mixed salt compound which includes at least two different cations and corresponding anions wherein at least one of the cations is selected from a group (A) of the elements Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Ag, Sn, Sb, La, Pr, Ta, W and Ce and at least one further cation is selected from a group (B) of the elements of the 3rd to 6th periods of the main groups II and III, the 5th to 6th periods of the main group IV and the 4th to 5th periods of the secondary group III to VIII and the lanthanides of the periodic table of elements, wherein anions in the pigment contain phosphorus-bearing oxoanions.