Erasable optical recording medium

Details Erasable optical recording medium Erasable optical recording medium

G - Physics

11

B

42/5, 18/99, 327

G11B 7/24 (2006.01) G11B 7/245 (2006.01)

Patent

CA 1192307

ABSTRACT OF THE DISCLOSURE Provided is an erasable recording medium and a method for recording and erasing same. The erasable recording medium comprises a thermally stable substrate and a polymeric layer deposited on the substrate comprised of a polymer exhibiting: (i) a Vicat softening point of from about 45 to 120°C; (ii) a surface tension in dynes/cm and a melt viscosity in poise in the temperature range of from about 140°C to 200°C such that the ratio of said surface tension to melt viscosity at some point within said temperature range is at least 2:1; and (iii) a temperature for the onset of thermal degrada- tion of at least 250°C. The recording medium has excellent dimensional and mechanical stability on storage, readily and easily records in- formation, and yet, has an ability to be easily and completely erased when erasure is desired.

430558

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