Patent ID: 7553604
Filing Date: 2009-06-30
Classification: C09B,G11B,Y10S

Abstract:
1. An optical recording medium comprising a substrate and an optical recording layer, the optical recording layer being a thin film formed of the optical recording material containing a cyanine compound represented by formula (I): wherein ring A and ring B each represent a substituted or unsubstituted benzene ring or a substituted or unsubstituted naphthalene ring; R 1 , R 2 , R 3 , and R 4 each represent an alkyl group having 1 to 4 carbon atoms or a substituted or unsubstituted benzyl group, or R 1 and R 2 are taken together, or R 3 and R 4 are taken together, to form a 3- to 6-membered ring, provided that at least one of R 1 , R 2 , R 3 , and R 4 is a substituted benzyl group to (i) provide a lower thermal decomposition temperature than if at least one of R 1 , R 2 , R 3 , and R 4 is not a substituted benzyl group and (ii) a thermal decomposition of the cyanine compound is less than 233.2° C.; Y 1 and Y 2 each represent an organic group having 1 to 30 carbon atoms; An m− represents an m-valent anion; m represents an integer 1 or 2; p represents a coefficient for maintaining overall charge neutrality.