Patent ID: 6077584
Filing Date: 2000-06-20
Classification: C09B,G11B,Y10S,Y10T

Abstract:
A dye composition suitable for forming an optical information recording layer for carrying out recording and readout with laser beams, which comprises at least one cyanine dye of formula (VI): ##STR9## wherein R.sub.1 and R.sub.2 independently represent alkyl groups, Z represents an atomic group for forming a substituted or unsubstituted aromatic ring, and Y represents a linking group for forming a carbocyanine and X.sup.- is an anion;and at least one leuco compound of formulae (VII) or (VIII): ##STR10## where each R= ##STR11## wherein each R.sub.1 is independently selected from an alkyl group having a number of carbon atoms from 2 to 5; and ##STR12## where each R.sub.2 is independently selected from an alkyl group having a number of carbon atoms from 1 to 5.