Abstract:
The present invention provides new intermediate compounds enabling the preparation of N-meso substituted cyanine, merocyanine or oxonole dyes wherein the N-meso substituent comprises electron withdrawing groups and wherein such N-meso substituents are introduced at the intermediate level. These intermediates enable the formation of dyes having in the meso-position N-substituents comprising electron withdrawing groups without the need for further derivatization of the meso-substituent at the dye level.
Abstract:
The present invention relates to an infrared absorbing dye as defined in claim 1. The present invention relates also to a heat- sensitive imaging element comprising said IR dye and more particularly to a heat-sensitive lithographic printing plate precursor comprising said IR dye. The present invention relates also to a method for making a lithographic printing plate whereby a print-out image of high contrast is formed upon exposure to IR- radiation or heating.