Magnetooptical recording media

Details Magnetooptical recording media Magnetooptical recording media

G - Physics

11

B

154/140, 352/33.

G11B 11/14 (2006.01) G11B 11/105 (2006.01)

Patent

CA 2001147

Optical recording media disclosed herein are excellent in adhesion between the substrate and the enhancement film, as well as in oxidation resistance and long term-stability of magnetooptical recording characteristics. The substrate contains a composition of a random copolymer of ethylene and a cycloolefin and having the formula: Image ... [I] (wherein n is 0 or a positive integer and R1-R12 are each hydrogen, halogen or hydrocarbon or two of R9-R12 together form a ring or R9 and R10 or R11 and R12 together form alkylidene). The composition comprises the random copolymer [A] having an intrinsic viscosity of 0.05 to 10 dl/g and a softening temperature of at least 70°C and the random copolymer [B] having an intrinsic viscosity of 0.05 to 5 dl/g and a softening temperature of less than 70°C at a random copolymer [A]/random copolymer [B] weight ratio of from 100/0.1 to 100/10.

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