Polyester Fiber and Film

THE WIDE VARIETY OF END PRODUCTS that may develop from a single line of basic chemical research is well illustrated by the duPont development of polyester fibers and polyester films. At the same time the history of these products is indicative of the long period of time that often elapses between the fundamental research and its commercial application. Dacron polyester fiber (duPont's newest synthetic textile ber), Mylar polyester film, and a newly developed polyester base for photographic film are all closely related chemically, being made from ethylene glycol and terephthalic acid, which, in turn, are derived in part from natural gas and petroleum.