INK COMPOSITION FOR HIGH-QUALITY/HIGH-DEFINITION SCREEN PRINTING, PRINTED MATTER PRODUCED BY THE SCREEN PRINTING INK COMPOSITION, AND METHOD FOR PRODUCING THE PRINTED MATTER

摘要

An ink composition for high-quality/high-definition screen printing that, when producing printed matter by screen printing on an object to be printed using a 360-mesh screen printing plate formed by a high-strength, non-deforming stainless steel mesh with a filament diameter of 25 pm, produces printed matter with a printed image edge spreading width of no more than 10 µm from the image design dimensions of the printing plate, the ink composition for screen printing containing a solvent with a boiling point of 170°C or higher at 70 wt% or greater of the total solvent, and a prepolymer or polymer with a weight-average molecular weight of 2000 or greater at 2 wt% or greater with respect to the total ink composition, and having a viscosity of 30 to 180 Pa .cndot.s as measured with a BH-type rotating viscosimeter at 25°C, and a thixotropic index of 2.0 to 8Ø