Occidental becomes the third partner in Equistar. Lyondell acquires ARCO Chemical Company.
Equistar Chemicals, LP is formed as a joint venture between Lyondell and Millennium Chemicals Inc.
LYONDELL-CITGO Refining (LCR) is formed as the Houston Refinery becomes a joint venture with CITGO Petroleum Corporation.
Lyondell acquires low-density polyethylene (LDPE) and polypropylene (PP) businesses from Rexene.
Lyondell is spun off from ARCO, becoming a public company listed on the New York Stock Exchange (Ticker symbol: LYO).
Lyondell Chemical Company is formed from selected chemical and refining assets of Atlantic Richfield Company (ARCO).
Spheripol process, currently the most widely used polyolefins process technology, is first introduced by predecessor company Montedison.
Start-up of the first Hostalen high density polyethylene (HDPE) process plant.
The PO/TBA process, invented by Atlantic Richfield Company. (ARCO), produces propylene oxide with tertiary butyl alcohol (TBA) as the co-product.
Natta and Ziegler are jointly awarded the Nobel Prize in Chemistry for their discoveries in polyolefins technology and catalysts.
LyondellBasell predecessor company scientist Giulio Natta polymerizes the first crystalline polypropylene.
LyondellBasell predecessor company scientist Professor Karl Ziegler discovers the first linear polyethylene (PE) chain.