The fundamental basis for the successful development of low temperature rubber after the end of the war lay largely in the use of systems employing what are currently termed "speed-up" chemicals to increase the rate of polymerization at low temperatures. Stewart and Fryling (40) reported early in 1943 the use of certain redox systems in speeding up the polymerization of GR-S. The German experience with low temperature recipes has been reported by Livingston (38). In 1945 patents were issued to Fryling (14) and Stewart (39, 41) of The B. F. Goodrich Co., covering such systems. Goodyear reported in early 1946 to Rubber Reserve (18) that similar studies had been carried out in its laboratories before the war.These systems involved the use of,both an oxidizing and a reducing agent. Other patents covering systems of oxidizingreducing agents have been issued in this country and in France and Germany (4,10,44,46)• The teams of the U. S. Technical Missions to Europe in 1945-46 brought back to the United States reports (34, 39, 4?) of German work on chemical rubber; these included work on a redox polymerization system, briefly reported by Weidlein (45). Actually the use of a redox system in chemical rubber manufacture was developed independently by scientists in England, Germany, and the United States, but the work in England was fundamental research and that in Germany had not. progressed beyond the laboratory or pilot plant stage.
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