PLATE SURFACE CORRECTING LIQUID FOR LITHOGRAPHIC PLATE REQUIRING NO DAMPENING WATER

摘要

PURPOSE:To obtain a plate surface correcting liq. having a superior adhesive property to a silicone rubber layer by mixing multifunctional linear diorganopolysiloxane having functional groups at both terminals with nonfunctional polysiloxane and by blending the mixture with a cross-linking agent and a cross- linking catalyst. CONSTITUTION:This invention relates to a plate surface correcting liq. for a lithographic plate requiring no dampening water and having a silicone rubber layer as the ink repellent layer. 50pts.wt. of methoxydimethylpolysiloxane having one or more functional groups at each of both terminals are mixed with 50 parts dimethylpolysiloxane having no functional group or only one functional group at one terminal. The mixture is blended with 10 parts tetramethoxysilane as a crosslinking agent and 2 parts dibutyltin acetate as a catalyst accelerating a cross-linking reaction, and the blend is dispersed or dissolved in an isoparaffin solvent. The resulting plate surface correcting liq. has a superior adhesive property to a plate surface, and the printing resistance of the corrected surface is increased by about 3 times.