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US 2001/0044074 A1Published application
Cyanine dyes
AssigneeKabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo
InventorsAyako Hohsaka, Dai Matsuura, Toshio kawata, Shigeo Yasui
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Abstract
Disclosed are novel trimethine cyanine dyes, light absorbents, light-resistant improvers, and optical recording media which comprise the trimethine cyanine dyes. The cyanine dyes exert satisfactory solubility and heat resistance when used in high-density optical recording media.
Claims28
A trimethine cyanine dye represented by Formula 1, which has solubility of at least 50 mg/ml in diacetone alcohol at 20° C.
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- wherein Formula 1, R1 and R2 independently represent an aliphatic hydrocarbon group which may have a substituent;
- Z1 and Z2 independently represent a fused naphthalene ring to form a benzoindolenin ring which may have a substituent;
- and X− represents a counter ion.
1 more element
A trimethine cyanine dye represented by Formula 1, which has a decomposition point of over 272° C.
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- wherein Formula 1, R1 and R2 independently represent an aliphatic hydrocarbon group which may have a substituent;
- Z1 and Z2 independently represent a fused naphthalene ring to form a benzoindolenin ring which may have a substituent;
- and X− represents a counter ion.
1 more element
Dependencies are inferred from the claim text.