| 摘要 |
A (photo)thermographic material is provided, capable of being used to produce a lithographic printing plate, comprising a support, a hydrophobic thermosensitive layer and a hydrophilic surface adjoining the hydrophobic thermosensitive layer, the thermosensitive layer containing an ingredient A, for example a substantially light-insensitive organic silver salt, which upon negative or positive image-wise heating reacts with at least one other ingredient B, for example a reducing agent therefor, in thermal working relationship therewith, producing a moiety which changes the adhesion between the thermosensitive layer and an adjoining hydrophilic surface. The thermographic material is rendered photothermographic by incorporating a photosensitive agent in said hydrophobic thermosensitive layer which after exposure is capable of catalyzing said reaction between said ingredient A and said ingredient B to produce said moiety which changes the adhesion between said hydrophobic thermosensitive layer and said adjoining hydrophilic surface. |
