The discoveries of organometallic catalysts for olefin polymerization by
Karl Ziegler and that of stereoregular olefin polymers by Giulio Natta
are probably the two most important achievements in the areas of
catalysis and polymer chemistry in the second half of this century. They
led to the development of a new branch of chemical industry, and to a
large volume production of high-density and linear low-density
polyethylene, isotactic polypropylene, ethylene-propylene rubbers,
isotactic poly- I-butene, and poly-4-methyl-l-pentene. These discoveries
merited the Nobel prize, which was awarded to K. Ziegler and G. Natta in
1963. The initial works of Ziegler and Natta were followed by an
"explosion" of scientific papers and patents covering all aspects of
polymerization chemistry, catalyst synthesis, and polymerization
kinetics as well as the structural, chemical, physical, and
technological characteristics of stereo regular polyolefins, polydienes,
and olefin copolymers. It is sufficient to say that in the twenty-five
years after the first publications more than 15,000 papers and patents
appeared on subjects related to the area. . The development brought
about the establishment of several prominent groups of scientists
occupied with the study of olefin polymerization. The most important of
these were scientific schools in Italy, Germany, England, the United
States, Japan, the Soviet Union, Czechoslovakia, and Venezuela. In
addition, many major chemical and petrochemical corporations throughout
the world established labora- tories devoted to the development of the
technology of catalyst synthesis and olefin polymerization.