| abstract |
Probided is lithographic printing plates and processes for preparing the lithographic printing plates having excellent printing durability, staining resistance and staining resistance over time. n A lithographic printing plate precursor comprising: a substrate; a photosensitive layer provided on the substrate; and an extra layer optionally provided between the substrate and the photosensitive layer; wherein the photosensitive layer or the extra layer adjacent to the substrate contains (A) a copolymer; and wherein the copolymer (A) comprises: (a1) a repeating unit having a structure represented by formula (a1-1) below in a side chain, and (a2) a repeating unit having at least one of the structures represented by formulae (a2-1)to (a2-6) below in a side chain. L 1 represents a single bond, a divalent aromatic group containing 6 to 14 carbon atoms, -C(=O)-O-, or -C(=O)-NR 2 - (wherein R 2 represents a hydrogen atom, alkyl or aryl). Z 1 represents a divalent linking group selected from the group consisting of a divalent aliphatic group containing 1 to 14 carbon atoms, a divalent aromatic group containing 6 to 14 carbon atoms, -NH-, -O-, -S- and a combination thereof, provided that both ends are not -NH-, -O- or -S-, and when L 1 is a divalent aromatic group containing 6 to 14 carbon atoms, Z 1 is not a divalent aromatic group containing 6 to 14 carbon atoms, and the divalent aliphatic group, divalent aromatic group and -NH- may have a substituent instead of a hydrogen atom. R 1 represents a hydrogen atom, alkyl, aryl, heterocyclyl, sulfo, alkylsulfonyl and arylsulfonyl. R 21 , R 22 and R 23 each independently represent a hydrogen atom, halogen atom or C1-8 alkyl. |