Patent ID: 7468201

Claim:
Materials for high density optical recording media, represented by azo metal chelate compounds of formula (I): in which R 1 represents C 1-6 alkyl, phenyl or C 1-6 alkyl-substituted phenyl; R 2 and R 3 , independently of each other, represent identical or different C 1-6 alkyl, optionally substituted by C 1-6 alkyl; W represents hydrogen, C 1-6 alkyl, C 1-6 alkoxy or halogen; X represents hydrogen, C 1-6 alkyl, C 1-6 alkoxy or halogen; Y represents hydrogen or an amino derivative; Z represents hydrogen, C 1-6 alkyl, C 1-6 alkoxy or halogen; M represents a divalent metal selected from Group IB, IIB or VIIIB in Periodic Table.