Cyanine dyes
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United States of America Patent
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Jul 22, 2008
Grant Date -
Sep 25, 2003
app pub date -
May 16, 2003
filing date -
Dec 17, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides organic dye compounds having their absorption maxima in a region ranging from the ultraviolet region to a relatively short wavelength visible region and uses thereof. The present invention provides specific monomethine cyanine dyes, light absorbents and optical recording media comprising the monomethine cyanine dyes, and a process for producing the monomethine cyanine dyes which comprises a step of reacting a quaternary ammonium salt of nitrogen atom-containing heterocyclic compound having a reactive methyl group with a quaternary ammonium salt of nitrogen atom-containing heterocyclic compound having an appropriate leaving group.
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