Object produced by a molding process and marked by a diffraction grating, and method for the production thereof

A marked object produced by a moulding process, wherein the marked object

• comprising at least partially of a soft polymer with additives which do not shrink, wherein the soft polymer has an inhomogeneous shrinkage volume of at least 1%, wherein the inhomogeneous shrinkage is achieved through granular polymer raw material as additives which do not shrink in the shrinking soft polymer, and
• the marked object comprising a marking, wherein the marking comprises a surface and has a grating structure on or in this surface,
• wherein the marking comprises several partial regions of the grating structure which are regions with and regions without diffraction structures, which form an optically recognizable symbol,
• whereby the moulding process is an injection moulding process with a master and the grating structure is present in the surface of the soft polymer,
• wherein the grating structure of the marked object comprise grating lines and wherein the grating structure of the marked object has through the moulding deviation due to the inhomogeneous shrinkage in the granular soft polymer at least two regions,
• whereby the grating structure has a grating constant which on illumination of the grating structure with light visible to the human eye generates a diffraction structure comprising the grating lines,
• wherein the grating lines moulded from the master grating lines of different regions of the marked object are phase-shifted and/or angularly displaced in relation to each other, that these grating lines are not visible to the observer in normal diffuse light conditions.