Optical disk substrate

Details Optical disk substrate Optical disk substrate

1988-12-02

1990-03-27

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 4284111, 428913, 430945, 346 76L, 3461351, 369288, B32B 300

Patent

active

049119664

ABSTRACT:
An optical disk substrate made of a non-crystalline thermoplastic resin comprising from to 80 to 100% by weight of a vinyl cyclohexane polymer (A) containing at least 80% by weight of a vinyl cyclohexane component in the molecular chain and from 0 to 20% by weight of a vinyl aromatic polymer (B) and having a light transmittance of at least 85%, a water absorbance of at most 0.1% by weight and a double refraction of at most 50 nm.

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