Patent ID: 6743568
Filing Date: 2004-06-01
Classification: C09B,G11B,Y10S

Abstract:
In an optical recording medium comprising a recording layer on a substrate,the improvement wherein said recording layer comprises a trimethine cyanine dye represented by Formula 1 and having a decomposition point of over 272Â° C., in combination with a second trimethine cyanine dye represented by Formula 1 but having an anion other than an organic metal complex anion as a counter ion Xâˆ’; â€ƒwhere in Formula 1, R1 and R2 independently represent an optionally substituted aliphatic hydrocarbon group; Z1 and Z2 independently represent an optionally substituted fused naphthalene ring to form a benzoindolenic ring; and Xâˆ’ represents an organic metal complex as a counter ion represented by Formula 6; â€ƒwhere in Formula 6, Z3 and Z6 each represent an identical or different aromatic ring or heterocyclic ring, which optionally has one or more substituents; Z4 and Z5 each represent an identical or different heterocyclic ring substituded by one or more cyano groups and optionally one or more other substituents; M is a metal atom selected from the group consisting of metal elements of the 3 through 12 groups in the periodic table; and A and Aâ€² each represent an identical or different hetero atom, which is capable of forming a coordinate bond by providing an electron pair to M, and optionally forms an atomic group along with Z3 and Z6.