Patent ID: 7051652

Claim:
A wet offset printing form for a web-fed rotary printing device comprising: a top layer comprising a photocatalytically and thermally modifiable material, which can be brought into a hydrophilic state photocatalytically by irradiation with light and into a lipophilic state by heating, said top layer forming a surface that can be illustrated or an illustrated surface; absorption centers forming a part of said top layer for a radiation of said top layer with which heating of said top layer in a pattern of an image is brought about; wherein said absorption centers are dispersed in said photocatalytically and thermally modifiable material with at least some of said absorption centers being spaced from said top layer surface with at least some of said photocatalytically and thermally modifiable material disposed between said at least some of said absorption centers and said top layer surface; wherein said absorption centers are formed by particles of at least one light-absorbing semiconductor material.