Presensitized plate useful for preparing a lithographic printing plate

摘要

The present invention provides a negative-working presensitized plate useful for preparing a lithographic printing plate having a negative-working photosensitive layer on an aluminum substrate, which comprises an intermediate layer comprising a compound having at least one diazonium group and molecular weight of 1000 or less formed between said photosensitive layer and said aluminum substrate. The lithographic printing plate prepared from the negative-working presensitized plate of the present invention shows excellent adhesiveness between a substrate and a photosensitive layer and does not cause contamination in non-imaging areas during printing operation, while maintaining high sensitivity, sensitive range and performance of the photosensitive layer.