DEVELOPMENT OF SILVER METALLIC CO-EXTRUDED PLASTIC FILMS

摘要

Although (Al) flakes are commonly used in paint applications to achieve silver metallic appearance (high lightness and high flop), they are not capable of producing similar results in co-extruded plastic films. It was shown that Al flakes are folded and/or crimpled during melt processing. As a result, the flakes lost their flat morphology that is essential to achieve good orientation and high flop. It was demonstrated that high lightness and high flop can be achieved by using "reinforced" Al flakes. It was also shown that TiO_2 coated mica flakes remain flat morphology during melt processing. By understanding optical interference, additive color mixing, and light management, co-extruded polycarbonate films with high lightness and high flop close to automotive paint have been made.