This family of polypropylene know as Molecular weight adjustment of polypropylene after polymerization is today intensively practiced by producers in order to offer a wide range of grades to customers and polymerization operations. This operation, commonly called "vis-breaking" or "controlled rheology", is generally performed at the finishing step into an extruder by addition of peroxide. Viscosity reduction is controlled by the amount of peroxide introduced.
This approach is not only used PP producers but also by converters particularly where high fluidity is required like :
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