Lithographic printing plate

Patent name: Printing plate for lithographic printing Patent application number: 00129916.6 Publication number: 1302736
Abstract: The present invention provides positive or negative lithographic printing plates. It improves the hydrophilicity of the hydrophilic layer, and it is excellent in binding force with the support and improves the printing contamination. Even under strict printing conditions, the printed matter is free from contamination, and the laser can be used in a short time. Such as image scanning exposure, using a simple water development processing operation plate, or no development process, can be installed directly on the printing press for plate making. The feature is that a hydrophilic layer and a photosensitive layer are provided in this order on the support, and the hydrophilic layer is directly chemically bonded to the support surface and is formed of a polymer compound having a hydrophilic functional group. The photosensitive layer contains a high molecular compound having a hydrophilic, hydrophobic, or hydrophobic group that changes its functionality due to heat, acid, or radiation.