Presently described are retroreflective articles, such as pavement markings, that comprise transparent microspheres partially embedded in a (e.g., polymeric) binder. Also described are (e.g., glass-ceramic) microspheres, methods of making microspheres, as well as compositions of glass materials and compositions...http://www.google.fr/patents/US7579293?utm_source=gb-gplus-shareBrevet US7579293 - Pavement marking, reflective elements, and methods of making microspheres
Pavement marking, reflective elements, and methods of making microspheres
