| 摘要 |
PURPOSE:To provide the titled medium for an optical-type video disk, capable of recording by semiconductor laser light with low power and obtaining a large change in reflectance upon recording, wherein a specified IR-absorbing agent and a high molecular weight binder are incorporated in a recording layer. CONSTITUTION:An IR-absorbing agent of formula I , wherein R is H or lower alkyl, X is hexafluoroarsenate ion, hexafluoroantimonate ion, fluoroborate ion or perchlorate ion, m is 0-2, A is formula II or III, n is 1 or 2, provided that A is formula III where m is 2, and a high molecular weight binder are incorporated in a recording layer, in an information-recording medium 4 comprising a reflective layer 2 formed of Al or the like and a recording layer 3 sequentially provided on a transparent base 1 such as a glass sheet. |
