DURABLE AND FLEXIBLE INK COMPOSITION FOR HIGH-QUALITY/HIGH-DEFINITION SCREEN PRINTING PRINTED PRODUCT OBTAINED BY SCREEN PRINTING SAID INK COMPOSITION AND MANUFACTURING METHOD FOR SAID PRINTED PRODUCT

摘要

2. Description of the Related Art [0002] Recently, screen printing on electric and electronic parts made of a thermoplastic resin substrate and screen printing on graphic decoration have diversified designs of printed materials and high-precision printing images. Thus, printed materials having coarse- There is a growing demand for low-cost production. In addition, in the monochromatic pattern, it is required to improve the sharpness of the edge of the image and to improve the smoothness, so that a high quality and high precision of the visibility with which the printed image in which the fine pattern and the monochromatic pattern coexist are further increased. On the other hand, it is also required to have a flexibility capable of three-dimensionally forming a high-quality, high-precision printed matter as described above. When a printed material was produced by screen printing on a thermoplastic resin substrate using a 360 mesh screen plate produced by a high strength unstressed stainless steel mesh having a line diameter of 25 mu m, an image of the printing plate in which a monochromatic image pattern and a fine image pattern coexist A printing ink composition for screen printing which is capable of producing a printed material having a liquid leakage width of not more than 10 占 퐉 even at the edge or outline of any part of the image edge printed with respect to the designed dimension. The ink composition for screen printing according to JIS K5701-1: 2000 The flow radius measurement value of the ink composition 1 minute after the start of measurement was 13.0 to 24.0 mm and the flow radius measurement value 1 minute after the start of the measurement by the fluidity measurement method using the parallel plate viscometer was defined as "Quot; F60 ", and the flow radius measurement value after 45 seconds is " F45 & (TI value) of 2.0 to 8.0 and a boiling point of 170 占 폚 or higher with a BH type rotational viscometer at 25 占 폚 in an amount of 70% by mass or more of the entire solvent, Or more and a thermoplastic polymer having a weight average molecular weight of 4000 or more and a Tg of 20 to 95 占 폚 in an amount of 10% by mass or more based on the total amount of the ink composition, and further, when subjected to vacuum molding or pressure molding, Wherein a printing material having an elongation of 250% or more can be produced.