Processes and compositions for photogeneration of acid

Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Image layer portion transfer and element therefor

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430269, 430270, 430340, 430333, 430336, G03C 300

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active

054016070

ABSTRACT:
An infra-red sensitive acid-generating medium comprises a binder, an iodonium salt; and a squarylium dye capable of absorbing infra-red radiation having a wavelength within the range of about 700 to about 1200 nm, the dye having a squarylium ring the 1- and 3-positions of which are each connected, via a single sp.sup.2 carbon atom, to a pyrylium, thiopyrylium, benzpyrylium or benzthiopyrylium nucleus, at least one of the sp.sup.2 carbon atoms having a hydrogen atom attached thereto, and the 2-position of the squarylium ring bearing an O.sup.-, amino or substituted amino, or sulfonamido group.

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