Base plate for lithographic printing plate

摘要

An object of the present invention is to provide a base plate for a lithographic printing plate comprising a photosensitive layer that prevent the occurrence of the fingerprint rub-off phenomena and abrasion phenomena and offer superior anti-abrasiveness and chemical resistance. The present invention provides a copolymer having monomeric units shown in formula (I) and (II); an image-forming composition comprising the copolymer; and a base plate for a lithographic printing plate comprising, on a support structure, a photosensitive layer that contains the copolymer.