“PVC was accidentally discovered at least twice”

Where did PVC come from???  Read this and it will satisfy your curiosity!

This article is from Wikipedia:

PVC was accidentally discovered at least twice in the 19th century, first in 1835 by French chemist Henri Victor Regnaultand then in 1872 by German chemist Eugen Baumann. On both occasions the polymer appeared as a white solid inside flasks of vinyl chloride that had been left exposed to sunlight. In the early 20th century the Russian chemist Ivan Ostromislensky and Fritz Klatte of the German chemical company Griesheim-Elektron both attempted to use PVC in commercial products, but difficulties in processing the rigid, sometimes brittle polymer blocked their efforts. Waldo Semonand the B.F. Goodrich Company developed a method in 1926 to plasticize PVC by blending it with various additives. The result was a more flexible and more easily processed material that soon achieved widespread commercial use.

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