Process for the preparation of cyanine dyes with...

Details Process for the preparation of cyanine dyes with... Process for the preparation of cyanine dyes with...

2006-11-07

2006-11-07

Saeed, Kamal A. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C430S270100

Reexamination Certificate

active

07132550

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° 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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patent: 0591820 (1994-04-01), None
patent: 10-226170 (1998-08-01), None
patent: 11-119421 (1999-04-01), None
patent: 2001-277718 (2001-10-01), None

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