Patent ID: 8137891

Claim:
A lithographic printing plate precursor comprising (a) a substrate with a hydrophilic surface; and (b) a single-layer or multi-layer radiation-sensitive coating comprising a radiation-sensitive component and a copolymer CP soluble or dispersible in aqueous alkaline solution and comprising the units A, B and C, wherein unit A has the following formula unit B has the following formula and unit C is at least one unit selected from wherein each R and each R 1 is independently selected from hydrogen, alkyl, aryl, halogen and —CN, X is a spacer, each R′ is independently selected from hydrogen, alkyl and aryl, n is 0 or 1 and R 2a , R 2 , R 3a and R 3 are independently selected from hydrogen and alkyl, or R 2 and R 3 or R 2a and R 3a , together with the two C-atoms to which they are bonded, form an aryl group, a hetereoaryl group or an unsaturated or saturated carbocyclic or heterocyclic group; r, s, t and u are each 0 or 1, with the proviso that one of r and s is 0 if the C-atom to which R 2 and R 2a are bonded is part of a C—C double bond, and with the proviso that one of t and u is 0 if the C-atom to which R 3 and R 3a are bonded is part of a C—C double bond; and the dotted line indicates a double bond which may or may not be present, wherein the amount of unit A or, if different units A are present, their total amount, accounts for 5 to 60 wt. % based on the copolymer; and/or the amount of unit B or, if different units B are present, their total amount, accounts for 10 to 90 wt. %, based on the copolymer; and/or the amount of unit C or, if different units C are present, their total amount, accounts for 5 to 60 wt. %, based on the copolymer.