| http://www.w3.org/ns/prov#value | - The invention of the low-pressure process to make HDPE took place in both the U.S. and Europe at nearly the same time and centered around the development of types of catalysts that promoted ethylene polymerization at milder temperatures and pressures than were (and still are) used for LDPE.The first of these new catalysts was discovered in 1951 by Robert Banks and John Hogan at Phillips Petroleum
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