| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-quality photosensitive lithographic printing plate on which adhesion property (printing durability) is improved, good reproducibility for small spots is obtd., and contamination is a non-patterned part of the plate is prevented in a developing process. SOLUTION: This lithographic printing plate is produced by forming a hydrophilic layer containing SiO2 by >=50 and <=120mg/m2 and a photopolymerizable photosensitive layer on a supporting body having the following properties. Moreover, the printing plate contains a silane coupling agent having unsatd, groups in upper layers of the hydrophilic layer. The supporting body has an anodically oxidized film, and the center line average roughness (Ra) and the average roughness (Rz) of the surface in the range of >=0.3 and <=0.55μm, and >=3.0 and <=6.0μm, respectively. The hydrogen bonding componentγ(H) has the surface energy defined by formulaγ(H)=((1.159+2.159×cos(contact angle of H2 O)-cos(contact angle of CH2 I2 ))/0.379<2> (dyne/cm) range in >=10 and <=50dyne/cm. In the formula, each contact angles is obtd. by dropping 1.7μ1 H2 O or 1.3×1 CH2 I2 and measuring the contact angle 30sec after dropping the liquid. |
