method of producing a lithographic printing plate and planographic printing method

摘要

A platemaking method for a lithographic printing plate, comprises: imagewise exposing a lithographic printing plate precursor comprising: a hydrophilic substrate; and a negative image recording layer containing a water-insoluble polymer; and removing a non-exposed area of the image recording layer with an aqueous solution, wherein a temperature of the aqueous solution is higher than a glass transition temperature (Tg) of the water-insoluble polymer.