Preparation of cyanine dye for high density optical recording disk
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United States of America Patent
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Sep 28, 1999
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N/A
app pub date -
Feb 8, 1999
filing date -
Apr 18, 1998
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Abstract
A cyanine dye for using in high density optical disc recording medium, having the following structure: ##STR1## wherein R represents 4-methoxycarbonyl benzyl group, X.sup.- represents an acid anion, and n represents an integer of 1 or 2. This cyanine dye is suitable for use as a .lambda.=450 nm.about.650 nm visible light-absorbing organic dye useful as a high density optical disc recording medium.
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