Patent ID: 6379768
Filing Date: 2002-04-30
Classification: G11B,Y10T

Abstract:
An optical information recording medium comprising a substrate and a recording layer provided thereon on which information is recorded by irradiation with a laser beam, wherein the recording layer comprises a dye compound having the following formula (I):R1R2C&boxH;L1â€”L2&boxH;L3â€”NR3R4â€ƒâ€ƒ(I) in which each of R1 and R2 independently represents an electron-attracting group having a Hamett's substituent constant &sgr;p in the range of 0.2 to 0.9; each of L1, L2, and L3 independently represents a methine group which can have a substituent under such condition that two or three of L1, L2, and L3 can form a ring structure together with the substituent; and each of R3 and R4 independently represents a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, or a heterocyclic group, provided that each set of R1 and R2, R2 and a substituent of L1, R2 and a substituent of L2, R2 and a substituent of L3, a substituent of L1 and R3, a substituent of L2 and R3, a substituent of L3 and R3, and R3 and R4 can be connected to each other to form a ring structure.