Modern society is the so-called information society. Electric equipment like computers, cell phones, and flat-panel televisions are daily essential products in our lives nowadays. Ajinomoto Fine-Techno Co. provides electronic materials used for such equipment. The technical progress of semi-conductors helped quickly make electronics equipment smaller and more precise; high-performance insulating materials are essential to mount these semi-conductors in manufacturing of high-density printed circuit boards. ABF, an insulating film for printed circuit boards we developed for the first time in the world, is highly appreciated as an epochmaking product with its flexibility toward the progress of semi-conductors. It is applied for personal computers all over the world and established the position as a de facto standard.