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In order to produce relatively soft polypropylene materials, random copolymerization or impact copolymerization of propylene and ethylene or other α-olefins can be used, and low-modulus polypropylene can also be obtained by reducing the stereoregularity of polypropyle.
In studies on metallocene compounds catalyzed propylene polymerization, it was found that double-bridged indenyl metallocenes reduced the stereoregularity of the polymer compared to single-bridged indenyl metallocen.
Idemitsu Corporation of Japan has developed a series of metallocene catalysts with double-bridged C2 structure, which can be used to prepare low isotactic polypropylene: