Durable and flexible high-quality, high-definition ink composition for screen printing, printed matter obtained by screen printing the ink composition, and method for producing the printed matter

摘要

When a printed matter is produced by screen printing on a thermoplastic resin substrate using a 360 mesh screen printing plate made of a high strength undeformed stainless mesh having a wire diameter of 25 μm, a solid image pattern and a fine image pattern are obtained. An ink composition for screen printing capable of producing a printed material having a sagging width of 10 μm or less at the edge or contour of any part of the printed image with respect to the image design dimensions of the printing plate that coexists, The measured flow radius of the ink composition after 1 minute from the start of measurement by a flowability measurement method using a parallel plate viscometer (spread meter) at 25 ° C. according to K5701-1: 2000 is 13.0 to 24.0 mm. The flow radius measured 1 minute after the start of measurement by the fluidity measurement method using the parallel plate viscometer is “F60”, and the flow radius after 45 seconds. When the constant value is defined as “F45”, “F60” − “F45” ≦ 1.0 mm, the viscosity is 5 to 180 Pa · s with a BH type rotational viscometer at 25 ° C., and the thixotropic index (TI value) ) Is 2.0 to 8.0, the solvent having a boiling point of 170 ° C. or higher is 70% by mass or more of the whole solvent, the weight average molecular weight is 4000 or more, and Tg is 20 to 95 ° C. A thermoplastic resin group characterized in that a printed matter containing 10% by mass or more based on the total amount of the ink composition and having a printed image coating film with an elongation of 250% or more when subjected to vacuum forming or pressure forming is produced. An ink composition for screen printing used for the material is provided.