Method for forming a lithographic printing plate

Details Method for forming a lithographic printing plate Method for forming a lithographic printing plate

2005-01-18

2005-01-18

Chu, John S. (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

C430S158000, C430S163000, C430S270100, C101S467000

Reexamination Certificate

active

06844139

ABSTRACT:
Methods for forming images are disclosed. The images are formed by imaging and developing an imageable element comprising a layer of an imageable composition over a substrate. The imageable composition contains a polymeric binder, an acid activatable crosslinking agent, and an acid generator of the structure:in which:Y is hydrogen, halo, alkyl, diphenylamino, phenylthio, or (CH2)kSO3−in which k is 1 to 4;R1, R2, R3, and R4, are each independently hydrogen or SO3−with the proviso that the anion has two to four SO3−groups;Z1and Z2are each independently a benzo group or a naphtho group;Z3is two hydrogen atoms, a cyclohexene residue or a cyclopentene residue;X1 and X2 are each independently S, O, NH, CH2, or CMe2;Q⊕is an onium cation;n is 1 to 4; andm is 1 to 3, with the proviso that m is 1 when the anion has two SO3−groups; m is 2 when the anion has three SO3−groups; and m is 3 when the anion has four SO3−groups.

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