Patent ID: 6667087
Filing Date: 2003-12-23
Classification: G11B,Y10T

Abstract:
An optical information recording medium provided on a substrate with a recording layer, said recording layer contains at least one kind of trimethine-cyanine dye,wherein said trimethine-cyanine dye can be represented by the following general formula [1], [2], [3], [4]; wherein said â€œEWGâ€  represents any electron-withdrawing substituted group; wherein said â€œR1â€  and â€œR2â€  may be the same or different from each other and each is one of an individually substituted or unsubstituted alkyl, phenyl, benzyl, alkylphenyl and a phenoxyalkyl group; wherein said â€œR3â€  and â€œR4â€  may be the same or different from each other and each is one of a hydrogen atom, halogen atom, alkoxy, hydroxyl, and an alkyl group; wherein said â€œYâ€  is one of a halogen atom and an alkyl group; wherein said â€œXâˆ’â€  is an anion selected from the group consisting of Fâˆ’, Clâˆ’, Brâˆ’, Iâˆ’, ClO4âˆ’, BF4âˆ’, PF6âˆ’, SbF6âˆ’, OTsâˆ’, OMsâˆ’, SCNâˆ’, alkylsulfonate, and akylcarboxylate; and wherein said trimethine-cyanine dye has a maximum absorption wavelength in the range of 575 nm to 590 nm in acetonitrile solution.