Patent ID: 6815033
Filing Date: 2004-11-09
Classification: G11B,Y10T

Abstract:
An optical recording medium comprising a substrate and a recording layer on which recording and readout of information can be carried out by laser, formed on the substrate, wherein the recording layer contains a compound of the following formula [I]: wherein each of R1 to R4 is a hydrogen atom or an optional substituent, provided that R1 and R2, and R3 and R4, may be bonded to form a hydrocarbon ring or a heterocyclic ring structure, and the hydrocarbon ring and the heterocyclic ring may have a substituent;X1 is an electro-withdrawing group, and X2 is a hydrogen atom or â€”Qâ€”Y (wherein Q is a direct bonding, a C1-2 alkylene group, an arylene group or a heteroarylene group, and Y is an electro-withdrawing group, provided that the alkylene group, the arylene group and the heteroarylene group may have an optional substituent in addition to Y); and Z is â€”Oâ€”, â€”Sâ€”, â€”SO2â€” or â€”NR5â€” [wherein R5 is a hydrogen atom, a hydrocarbon group which may be substituted, a heterocyclic group which may be substituted, a cyano group, a hydroxyl group, an amino group represented by â€”NR6R7 (wherein each of R6 and R7 which are independent of each other, is a hydrogen atom, a hydrocarbon group which may be substituted, a heterocyclic group which may be substituted or â€”COR8 8 is a hydrocarbon group which may be substituted or a heterocyclic group which may be substituted>) or â€”COR9 (wherein R9 is a hydrocarbon group which may be substituted or a heterocyclic group which may be substituted), provided that when R5 is a hydrocarbon group, it may be bonded with R2 or R4 to form a cyclic structure].