MICROSPHERE COMPRISING A POLYMER CORE, A SHELL AND AN ABSORBER

摘要

The present invention relates to a microsphere comprising a core comprising a polymer and two or more laser light absorbers, and a shell. The particle size of the microspheres is, for example, 50 nm to 50 mu m, preferably 100 nm to 10 mu m. The core comprises a thermoplastic polymer and the shell comprises a compatibilizer. The laser light absorber can be an oxide, hydroxide, or hydroxide of a metal such as copper, bismuth, tin, aluminum, zinc, silver, titanium, antimony, manganese, iron, nickel, barium, gallium, germanium, arsenic, chromium, Sulfides, sulfates and phosphates, laser light absorbing inorganic (organic) dyes, and metal oxide coated flakes. The present invention also relates to the use of microspheres as laser marking additives and to the process for producing microspheres by reactive extrusion.