Patent ID: 7425402

Claim:
A heat-sensitive lithographic printing plate precursor comprising a support having a hydrophilic surface and an oleophilic coating, provided on the hydrophilic surface, said coating comprising: an infrared light absorbing agent, and a developer soluble polymer which comprises a phenolic monomeric unit wherein the phenyl group of the phenolic monomeric unit is substituted by a group Q, wherein Q has the structure of Formula 1 and is covalently linked to a carbon atom of the phenyl group, wherein L 1 , L 2 and L 3 each represent a linking group, each group independently selected from alkylene, arylene, heteroarylene, or wherein L 2 and L 3 together represent the necessary atoms to form a cyclic structure, wherein a, b and c are 0 or 1, wherein T 1 represents a terminal group selected from hydrogen or optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclic, aryl, heteroaryl, aralkyl or heteroaralkyl group, wherein, if substituted, said alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclic, aryl, heteroaryl, aralkyl or heteroaralkyl group is substituted by a substituting group selected from —OR 1 , —SR 1 , —CO—OR 1 , —O—CO—R 1 , —CO—R 2 , —SO 3 —R 1 , —SO 2 —R 1 , —CN, —NO 2 , halogen, phosphate group, phosphonate group, t-amine group, amide group, imide group and sulphonamide group, wherein R 1 and R 2 are independently selected from hydrogen or an alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclic, aryl, heteroaryl, aralkyl or heteroaralkyl group, with the exception that R 2 is not hydrogen, and wherein T 2 and T 3 comprise a 5- or 6-membered heteroaromatic group or wherein T 2 comprises a 5- or 6-membered heteroaromatic group and T 3 is one of the groups selected from T 1 or wherein T 2 and T 3 together represent the necessary atoms to form a cyclic structure, optionally annelated with another cyclic structure, with the proviso that the polymer is not represented by the following structure