Patent ID: 8350015
Filing Date: 2013-01-08
Classification: C09B

Abstract:
1. A cyanine dye which is represented by Formula 1 and which exhibits an absorption maximum at a wavelength of longer than 400 nm but not higher than 550 nm and efficiently absorbs visible radiation ranging from 400 nm to 550 nm in the violet to green region in a solution and has a molar absorption coefficient (ε) of at least 5×10 which has a residual dye rate (%) of at least 99.3% when determined on determining an optical transmittance (T wherein in Formula 1, Z 1 and Z 2 mean monocyclic, condensed carbocyclic or heterocyclic aromatic rings which are the same or different from each other, and R 1 to R 6 independently denote aliphatic hydrocarbon groups which optionally bear a substituent.