PURPOSE: To improve an image characteristic and to obtain a lithographic printing plate which is superior overall, by laminating successively a layer contg. an ionomer resin, a layer of an ionomer resin and a water soluble polymer material, and a zinc oxide-resin dispersion photoconductive layer on a substrate.
CONSTITUTION: A layer consisting essentially of an ionomer resin is provided in two layers of an undercoating layer 2 and a precoating layer 3 between the substrate raw paper 1 on a conduction treated layer and a photosensitive layer 4. The undercoating layer has the functions to provide film forming property, high print resisting power and reduced printing elongation and the precoating layer has the functions to improve image quality and to provide film forming property. The ionomer resin alone may be used for the binder of the undercoating layer and the ionomer resin and a water soluble polymer resin are used in combination for the purpose of improving the image quality. It is further possible to add inorg. pigments such as calcium carbonate, talc, or the like in the undercoating layer and if necessary, in the precoating layer, by which the quality of the photoengraving image is much bettered.
MATSUURA TAKAYOSHI
FUKAZAWA KIYOSHI
| JPS55105580A | 1980-08-13 | |||
| JPS5336302A | 1978-04-04 |