| http://www.w3.org/ns/prov#value | - The polymer material of the invention is in one preferred embodiment obtained by co- polymerisation of at least said 3 different constituents, wherein said at least 3 different constituents are a) A filler material with an average particle size of at the most 750 ??m, such as at the most 250 ??m, said filler material consisting of filler covalently -O-linked to O H R 1 R; wherein R 1 is selected f
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