MOULDED DISCS

摘要

The invention concerns moulded discs for audio and/or optical data recording media such as CD's and DVD's, made of a material comprising, by weight: (a) 60 to 100 % of methyacrylic copolymer consisting in wt. % of 51 to 99 % of unit (1) derived from the methyl methacrylate monomer, 1 to 49 % of units (2) selected among units (i) derived from acrylic acid and/or methacrylic acid monomers associated with cyclic anhydride units derived from said acids, and optionally combined with the unit (ii) derived from the styrene alpha-methyl monomer, and 0 to 10 % of units (3) derived from at least a monoethylenically unsaturated comonomer copolymerisable with the methyl methacrylate monomer, and (b) 0 to 40 % of at least an impact modifier.