Patent ID: 7695888

Claim:
A photosensitive lithographic printing plate comprising a hydrophilic support and a photopolymerizable photosensitive layer containing the following components (i) to (v): (i) a sensitizing dye having an absorption maximum in a wavelength range of from 360 to 450 nm; (ii) a hexaarylbisimidazole compound; (iii) an addition polymerizable compound having an ethylenically unsaturated double bond; (iv) a binder polymer; and (v) a mercapto compound represented by the following formula (1): wherein R 1 represents a group containing an aromatic ring and having from 6 to 20 carbon atoms; and X represents N(R 2 )— in which R 2 represents a straight chain or branched alkyl group having from 1 to 18 carbon atoms, an alkyl group containing an alicyclic structure and having from 5 to 20 carbon atoms or a group containing an aromatic ring and having from 6 to 20 carbon atoms.