Method for preparation of printing plate by electrophotographic process

摘要

A method for preparation of a printing plate by an electrophotographic process comprising forming a peelable transfer layer capable of being removed upon a chemical reaction treatment on a surface of an electrophotographic light-sensitive element, forming a toner image by an electrophotographic process on the transfer layer, heat-transferring the toner image together with the transfer layer onto a receiving material having a surface capable of providing a hydrophilic surface suitable for lithographic printing at the time of printing, and removing the transfer layer on the receiving material upon the chemical reaction treatment wherein the transfer layer has a stratified structure composed of a first transfer layer (T1) which is contact with the surface of electrophotographic light-sensitive element and is formed by an electrodeposition coating method using thermoplastic resin grains (AL) each containing a rein (A1) having a glass transition point of from 10 DEG C. to 140 DEG C. or a softening point of from 35 DEG C. to 180 DEG C. and a resin (A2) having a glass transition point of not more than 45 DEG C. or a softening point of not more than 60 DEG C. wherein the glass transition point or softening point of resin (A1) is at least 2 DEG C. higher than that of resin (A2) and a second transfer layer (T2) provided thereon mainly containing a resin (A2). The transfer layer according to the present invention has excellent transferability onto a receiving material under transfer conditions of low temperature and high speed to form transferred images of good qualities thereby providing a printing plate which produces prints of good image qualities.