Substrate composed of at least one cycloolefin copolymer for...

Details Substrate composed of at least one cycloolefin copolymer for... Substrate composed of at least one cycloolefin copolymer for...

G - Physics

11

B

G11B 7/24 (2006.01) C08F 210/02 (2006.01) C08F 232/04 (2006.01) C08F 232/08 (2006.01) G11B 7/253 (2006.01)

Patent

CA 2107724

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 M w/M n is < 2.0, or COC blends are produced which are composed of a first component having M w < 30,000 g/mol and M w/M n <= 2, preferably < 2, and a second component having M w > 15,000 g/mol and M w/M n 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 M w/M n of < 2 or of a blend composed of such a COC and one or more COCs having a molar-mass distribution of 2 <= M w/M n < 4 and M w of between 15,000 and 250,000 g/mol.

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