Patent ID: 6348250
Filing Date: 2002-02-19
Classification: B32B,C09B,G11B,Y10S,Y10T

Abstract:
An optical recording medium comprising a transparent substrate, a recording layer, a reflecting layer and a protecting layer; wherein the improvement comprises the recording layer containing one or a mixture of more than one phthalocyanine dye can be represented by formula (I) wherein:M is Pb, Pd, Ni, Cu, Zn, Co, Mg, Fe, VO or TiO X is Cl, Br or I n is 0 or an integer of 1 to 4 k is any number from 1 to 4 R1 is alkoxy substitutent derived from hydroxy-containing bicyclo-alkyl compounds; the hydroxy-containing bicyclo-alkyl compounds can be represent by formula (II) and (III); â€ƒwherein, X Y and Z are, independent from each other, a hydrogen, halogen, methyl or ethyl groups R3, R4, R5, R6, R7 and R8 are, independent from each other, C1-4 linear or branched alkyl group with or without halogen substitutent groups, R2 is C1-20 linear alkyl group with or without substitutent group, C1-20 branched alkyl group with or without substitutent group, C1-20 linear alkoxy group with or without substitutent group, C1-20 branched alkoxy group with or without substitutent group and aryloxy groups with or without substitutent group.