| 摘要 |
As starting materials for substrates for optical storage disks, cycloolefin copolymers (COC) are produced by a polymerization process in which the polymerization is terminated at a point in time at which the molar-mass distribution Mw/Mn is <2.0, or COC blends are produced which are composed of a first component having Mw<30,000 g/mol and Mw/Mn</=2, preferably <2, and a second component having Mw>15,000 g/mol and Mw/Mn less than/equal to 4 and greater than/equal to 2. The substrate is produced by thermal deformation either of a single COC having a molar-mass distribution Mw/Mn of <2 or of a blend composed of such a COC and one or more COCs having a molar-mass distribution of 2</=Mw/Mn<4 and Mw of between 15,000 and 250,000 g/mol.
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