Patent ID: 8993085
Filing Date: 2015-03-31
Classification: C09B,G11B,Y10T

Abstract:
1. A recordable optical recording medium, comprising a substrate on which at least a reflective layer, a recording layer and a light transmission layer are provided, characterized in that the recording layer is formed by adding a low hydrophilic and highly waterproof organic dye to a triazole-based azo metal complex dye represented by the following general formula (1): (in the general formula (1), a cyclic part is composed of a carbon atom, an oxygen atom and a hydrogen atom; R is a functional group selected from the group consisting of a hydrogen atom, an alkyl group having four or less carbon atoms, a benzyl group, a diethylamide group, a halogen group, a trifluoro methyl group, a methoxy group, a thiomethyl group and N,N-diethyl carbamoyl group; the alkyl group may have a straight chain alkyl, branched chain alkyl or cyclic structure; and M is a metal atom selected from the group consisting of nickel, cobalt and copper) and using the resultant organic dye, and wherein the low hydrophilic and highly waterproof organic dye added to the triazole-based azo metal complex dye represented by the general formula (1) has an optical density ratio of 60 wt % or more, the ratio being between the optical density being at a maximum absorption wavelength (λmax) before a dye thin film is immersed into hot water of 75° C. and the optical density being at the maximum absorption wavelength (λmax) after the dye thin film is immersed into the hot water for 30 minutes.