| http://www.w3.org/ns/prov#value | - Examples of compositions which are suitable according to the invention for manufacturing photochromic transparent materials and articles, comprise one or several photochromic compounds according to the invention in combination with one or several of the following polymers: polymers from polyolallylcarbonate monomers, polyacrylates, polyalkyl-acrylates such as polymethyl methacrylate (PMMA), cellul
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