Patent ID: 7108959

Claim:
A printing plate material in roll form of the on-press development type comprising a support, a functional layer including a hydrophilic layer containing metal oxide particles and a thermosensitive image formation layer containing heat melt or heat fusible particles, provided on one side of the support, and a back coat layer provided on the other side of the support, the functional layer containing first matting agents having an average particle diameter of 4.0 to 10 μm in an amount of from 0.2 to 5.0 g/m 2 and having first protrusions formed from the first matting agents, and the back coat layer containing second matting agents having an average particle diameter of 3.0 to 8 μm in an amount of from 0.01 to 1.0 g/m 2 and having second protrusions formed from the second matting agents, wherein an average protrusion height of the first protrusions is 0.5 to 5.0 μm higher than that of the second protrusions.