How was Giulio Natta awarded the Noble Prize?

Name: Giulio Natta. 
Country: Italian.
Date of Birth: 26 February 1903.
Date of Death: 2 May 1979.
The subject of Study: Ziegler–Natta catalyst macromolecule polymer.
Noble Prize Year: Nobel Prize for Chemistry in 1963 for his research on high polymers.