DuPont Teijin Films Rolls Out UV-Stable Polyester Product

11/18/2016 10:33 AM 

DuPont Teijin Films is introducing several super-clear, UV-stable polyester films that are designed to retain mechanical and optical properties in applications involving UV exposure. These films, specifically engineered to block UV transmission, are the most recent additions to the MELINEX TCH family of low-haze and low-oligomer-bloom films that have been developed for the flexible electronics, display, photovoltaic, lighting, and label markets.  

“There is a perception that polyester films quickly degrade due to sunlight UV exposure, thus limiting the end-use applications for clear polyester films,” said Scott Gordon, business development manager for DuPont Teijin Films.  “Also, there are double-sided substrate photo patterning applications where the UV transmission for side A patterning must be blocked from simultaneously patterning side B. These new films will provide our customers with cost-effective substrate solutions that are ideal for a wide variety of UV light sensitive applications.”   

Bi-axially oriented, semi-crystalline polyethylene terephthalate (PET) films have many desirable properties for a wide range of applications, including dimensional stability, chemical resistance, tensile strength and electrical insulation. Standard PET polyester films transmit light above approximately 315nm wavelength; however, extended UV exposure can lead to changes in optical and mechanical properties such as color and film brittleness. Utilizing proprietary UV stabilizer technology, the new films from Dupont move the transmittance cut-off to about 375nm while enabling the PET film to retain mechanical and optical properties after accelerated UV aging.  The new films range in thickness from 50µm – 125µm. They maintain ~1 percent haze by minimizing the typical oligomer blooming effect that can be caused by exposure to elevated temperatures, and they are available with near-zero thermal shrinkage when processed through Dupont Teijan Films’ heat stabilization process.