Lithographic printing plate precursors with mercapto-functionlalized free-radical polymerizable monomers

摘要

Lithographic printing plate precursor comprising: a) an untreated or pretreated substrate and b) a radiation-sensitive coating comprising: (i) at least one polymeric binder soluble or swellable in aqueous alkaline developers; (ii) at least one free-radical polymerizable monomer and/or oligomer comprising at least one non-aromatic C-C double bond and at least one SH group in the molecule; and (iii) a radiation-sensitive initiator or initiator system for free-radical polymerization, wherein component (ii) has the formula (I) wherein each R^1a, R^1b and R^1c is independently selected from H, C₁-C₆ alkyl, C₂-C₈ alkenyl, aryl, halogen, CN and COOR^1d, wherein R^1d is H, C₁-C₁₈ alkyl, C₂-C₈ alkenyl, C₂-C₈ alkynyl or aryl; and Z is an aliphatic, heterocyclic or heteroaromatic spacer or a combination of two or more thereof, wherein Z can optionally comprise one or more additional SH groups and/or one or more additional non-aromatic C-C double bonds; and each Z¹ is independently selected from a single bond, formulae (Ia), (Ib), (Ic), (Id), (Ie), (If), (Ig), (Ih), (Ij), (Ik), (Im), (In), (Io), (Ip), (Iq), (Ir), (Is), (It), (Iu), (Iv), wherein R^2a, R^2b and R^2c are independently selected from H, C₁-C₆ alkyl and aryl, Z² is selected from a single bond, O, S and NR^2c, Z³ is a single bond which is connected to Z, b is an integer from 1 to 10 and c is an integer from 1 to 3.