Ink composition for high-speed screen printing, printed matter obtained by high-speed printing of the ink composition, and method for producing the printed matter

摘要

[PROBLEMS] In recent years, in high-speed screen printing using a cylinder press machine, not only graphic decoration but also high-speed screen printing on electrical and electronic parts, diversification of the design of the printed matter and high-definition of printed images Accordingly, there is an increasing demand for simple, low-cost and high-speed production of printed matter in which a fine pattern and a solid pattern having a large area coexist. In addition, for solid patterns, the sharpness of the image edges is improved and the leveling property is also improved, so that there is a need for higher quality and higher definition of printed images that contain both fine patterns and solid patterns. ing. Using a screen printing plate made by flat-processing a photosensitive emulsion film in a 355 mesh / inch polyester mesh printing plate, high-speed screen printing is performed on a printing medium at a squeegee speed of 400 mm / sec. Is a high-quality, high-definition high-speed screen printing ink composition capable of producing a printed product having a sag width of the printed image edge within 10 μm with respect to the printed image design dimensions of the printing plate, and having a boiling point Contains 70% by weight or more of the solvent having a temperature of 170 ° C. or more, 7% by weight or more of the prepolymer or polymer having a weight average molecular weight of 2000 or more based on the total amount of the ink composition, and BH type rotation at 25 ° C. Viscometer with viscosity of 6 Pa · s or more and less than 30 Pa · s, thixotropic index (TI value) of 2.0 to 8.0, J The measured flow radius of the ink composition was 14.0 to 24.0 mm one minute after the start of measurement by the flowability measurement method using a parallel plate viscometer (spread meter) at 25 ° C. according to SK5701-1: 2000. An ink composition for high-speed screen printing, comprising: [Selection figure] None