| abstract |
(57) [Summary] [Structure] In a positive photosensitive lithographic printing plate comprising a support and a photosensitive layer provided thereon, the photosensitive layer comprises a phenol derivative, Water-insoluble and alkali-water-soluble resin, and o-quinonediazide or diazonium salt or a compound which generates an acid upon exposure and at least one C-O- which can be decomposed by the acid A positive-working photosensitive composition comprising a mixture of compounds having a C group, wherein the phenol derivative comprises 4 to 8 benzene nuclei, at least one phenolic hydroxyl group and at least two formulas (I). A positive photosensitive lithographic printing plate having a group represented by: -CH 2 OR 1 (I) (In the formula, R 1 represents a hydrogen atom, an alkyl group or an acyl group.) [Effect] Burning entanglement does not occur even if the burning treatment is carried out at a high temperature, and the development latitude is wide. , Carcass, Excellent printing durability. |