Substrate composed of at least one cycloolefin copolymer for rec

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

1993-10-08

1995-08-08

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428913, 430270, 430945, 3461351, B32B 300

Patent

active

054397227

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

REFERENCES:
patent: 4614778 (1986-09-01), Kajiura et al.
patent: 5003019 (1991-03-01), Ishimaru
patent: 5008356 (1991-04-01), Ishimaru
patent: 5059462 (1991-10-01), Kurisu et al.
patent: 5242729 (1993-09-01), Hirata et al.
patent: 5302656 (1994-04-01), Kohara et al.
W. Schroter, et al. "Taschenbuch Der Chemie" 1990, pp. 52 & 53.

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