Optical information record medium

Details Optical information record medium Optical information record medium

1993-05-19

1999-11-30

Krynski, William

Stock material or miscellaneous articles

Composite

Of polycarbonate

428900, 430945, 528204, B32B 2736

Patent

active

059939710

ABSTRACT:
There is disclosed an optical information record medium having an optical information record layer on a transparent substrate, in which the transparent substrate is made of a resin material mainly consisting of a polycarbonate resin that contains no more than 4 wt % of low molecular weight fractions having a weight average measured with respect to a polystyrene molecular weight of no more than 3500, in order to avoid a double refraction of an optical information record medium resulting in an improved signal to noise ratio and having superior thermal-transformation resistance and impact resistance.

REFERENCES:
patent: 4631334 (1986-12-01), Masumoto et al.

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