Optical recording medium

Details Optical recording medium Optical recording medium

2008-05-13

2008-05-13

Mulvaney, Elizabeth (Department: 1794)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C428S064800, C430S270140

Reexamination Certificate

active

11393917

ABSTRACT:
In an optical recording medium having two recording layers of a first recording layer and a second recording layer, the second recording layer contains metallized azo dyes represented by the following general formula (I) or (II), and recording characteristics of the second recording layer are improved by having optical density of 1.3 times as large as, or 1.3 times greater than, that of a dye contained in the first recording layer.(In this regard, rings A1 and A2 are nitrogen-containing heteroaromatic rings, rings B1 and B2 are aromatic rings, and X is alkyl group substituted by at least two fluorine atoms).

REFERENCES:
patent: 4639745 (1987-01-01), Matsui et al.
patent: 5244774 (1993-09-01), Usami et al.
patent: 6168843 (2001-01-01), Kambe et al.
patent: 2006/0114799 (2006-06-01), Martens et al.
patent: 2003/331463 (2003-11-01), None

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