INK COMPOSITION FOR HIGH-QUALITY AND HIGH-RESOLUTION SCREEN PRINTING, PRINTED ARTICLE OBTAINED BY SCREEN PRINTING WITH SAME, AND METHOD FOR PRODUCING SAID PRINTED ARTICLE.

摘要

The present invention addresses the problem of achieving both sharpness and leveling properties in an image edge section of a solid pattern in a printed article in order to increase quality and resolution and improve the visibility of a printed image in which a fine pattern and a solid pattern are both present. The abovementioned problem is solved by the use of an ink composition for screen printing in which 70% or more of the total solvents by weight is a solvent having a boiling point of 170 °C or more, 2% by weight or more of the total amount of the ink composition is a pre-polymer or a polymer having a weight-average molecular weight of 2,000 or more, the viscosity at 25 °C according to a BH-type rotational viscometer is 30-180 Pa, and the thixotropic index is 2.0-8.0. The ink composition for screen printing makes it possible to produce a printed article in which the undercut width of the edge of a printed image is within 10 µm relative to the image design dimensions of a printing plate when a printed article is produced by screen printing on a printing substrate using a 360-mesh screen printing plate made from high-strength non-deformable stainless steel mesh having a wire diameter of 25 µm.