Process for the preparation of cyanine dyes with polysulfonate anions
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United States of America Patent
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Nov 7, 2006
Grant Date -
May 26, 2005
app pub date -
Nov 25, 2003
filing date -
Nov 25, 2003
priority date (Note) -
Expired
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Abstract
A convenient and economical method for preparing infrared absorbing cyanine dyes useful in lithographic printing plate precursors is disclosed. The reaction is generally carried out by condensation of a heterocyclic base containing an activated methylene group and an unsaturated bisaldehyde or its equivalent in a solvent or solvent mixture at about 20 150.degree. C. All the reactions necessary for production of the infrared absorbing cyanine dye may be carried out in one reaction vessel without isolating any intermediate products.
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