| 摘要 |
PURPOSE:To obtain the impression plate having good impression durability to any silicone composition, by a method wherein after contacting, in a picture state, the material containing substance generating hydrogen fluoride by heating to the silicone surface of direct drawing lithographic material, it is treated by heating. CONSTITUTION:A direct drawing lithographic material is prepared by providing the coating layer of the silicon having ink repellence on the base material composed of paper, plastic film, metal sheet, synthetic paper, etc. The material containing the substance generating hydrogen fluoride by heating (HF generating substance) is, in a picture state, contacted to the silicone layer surface of this direct drawing lithographic material. Then, it is treated by heating for 1sec-10min at a temperature of not less than the decomposition temperature of HF generating substance and when thermosoftening resin is jointly used, it is treated by heating at a temperature of not less than the melting point of said resin. There are ammonium salt of hydroflouric acid and amine salt thereof individually, or otherwise the mixture of metallic fluoride and ammonium salt, sulfuric acid, etc., or the like as abovementioned HF generating substance. |
