Answer
In the 1950s, Ziegler's research focused on organometallic chemistry. In 1953, he discovered a new catalyst for the polymerization of ethylene. This catalyst, which was a combination of titanium and aluminum, is now known as Ziegler-Natta catalyst. The catalyst is used to produce high-density polyethylene, which is used in a wide variety of products, such as plastic bottles and food packaging.