Thermochromic foils and injection molded parts
Thermoplastics are non-crosslinked polymers. Their primary feature is their moldability. This class of plastic includes polyolefins, polyesters, polyamides, polyacrylates and polyvinylchloride. Most thermoplastics melt without degrading and therefore can be processed into films and injection molding parts using extruder technology. During processing the raw materials are subjected to not only thermal, but also a high degree of mechanical stress. Our thermochromic pigments can be added to the polymer raw material before extrusion. This enables, for the first time, a technology-compatible production of thermochromic polymer films and injection molding parts by which the thermochromic dye is homogenously distributed throughout the entire volume of the polymer. Switching temperatures between 0 and 70° C and a broad array of color changes can currently be achieved. The color changing can be both reversible as well as irreversible.
Hybrid active-passive color changing is achieved through vapor coating of transparent electrodes onto the thermochromic polymer material in a high vacuum of 10-7 Torr. The electrodes can be prepared using a thermal process as well as an electrode beam.