Neoprene

Nieuwland discovered a polymer that, when polymerized and chlorine atoms added, mimics the properties of rubber. This substance, called neoprene, kept key American industries going during a rubber supply crisis.
 Julius Arthur Nieuwland United States 1931 Neoprene

Nieuwland discovered a polymer that, when polymerized and chlorine atoms added, mimics the properties of rubber. This substance, called neoprene, kept key American industries going during a rubber supply crisis.