Patent ID: 6225022
Filing Date: 2001-05-01
Classification: G11B,Y10S

Abstract:
Ann optical recording medium comprising a substrate, a recording layer formed thereon and a reflection layer which is overlaid on said recording layer, wherein said recording layer comprising at least one compound represented by formula (I), ##STR139##wherein M represents two independent hydrogen atoms, a bivalent, trivalent and tetravalent metal to which there may be bonded at least one oxygen atom or at least one halogen atom, or a bivalent, trivalent or tetravalent metal to which there may be bonded an unsubstituted or substituted alkyl group, an aryl group, an alkoxyl group, an aryloxy group --(OPR.sup.11 R.sup.12).sub.t group, --(OPOR.sup.13 R.sup.14).sub.t group, --(OSiR.sup.15 R.sup.16 R.sup.17).sub.t group, --(OCOR.sup.18).sub.t group, --(OR.sup.19).sub.t group, --(OCOCOOR.sup.20).sub.t group, --(OCOCOR.sup.21).sub.t group, or --(OCONR.sup.22 R.sup.23).sub.t group;in which R.sup.11 to R.sup.23 are each independently a hydrogen atom, a monovalent aliphatic hydrocarbon group which may have a substituent, or a monovalent aromatic hydrocarbon group which may have a substituent, and t is an integer of 0 to 2;R.sup.1 to R.sup.4 are each independently a hydrogen atom or an alkyl group which may have a substituent; and X.sup.1 to X.sup.4 are each independently a phenyl group substituted by alkyl, alkoxy, fluorine or a fluorine-atom containing group.