Optical recording medium and process for production thereof

Details Optical recording medium and process for production thereof Optical recording medium and process for production thereof

1990-04-25

1992-04-07

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428 76, 4284231, 428688, 428913, 369288, 346 76L, 3461351, 430945, 427162, 427166, 427167, B32B 302

Patent

active

051027097

ABSTRACT:
An optical recording medium is formed to include a resinous substrate, a laminate film including an inorganic dielectric layer and a recording layer, and a resinous protective film, respectively disposed on the substrate. The laminate film is formed to have a compression stress of 15-55 kg/mm.sup.2 so as to be in a dense film free from cracking or peeling. The resinous protective layer is formed to have a tensile stress of 2.5-5.5 kg/mm.sup.2 so as to compensate the compression stress in the laminate film, thus preventing warp and skew of the optical recording medium. The resinous protective film may preferably be formed from a photocurable composition comprising an increased amount of a polyacrylate compound providing a dense film and a urethane acrylate compound providing a flexibility.

REFERENCES:
patent: 4370391 (1983-01-01), Mori et al.
patent: 4579777 (1986-04-01), Honguu et al.
patent: 4680742 (1987-07-01), Yamada et al.
patent: 4740430 (1988-04-01), Frankenthal et al.
patent: 4801599 (1989-01-01), Aoyama et al.
patent: 4900598 (1990-02-01), Suzuki
Applied Phys. Letts., vol. 56, No. 15, 4-9-90, Protective Films . . . , Sugiyama et al, pp. 1403-1405.

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