Polypropylene is one of the most important general plastics and widely used for automobile

household appliances

electronic products

package

building material

furniture and so on. For the production of polypropylene industrially

external donor is expected to add and change the process of polymerization

and thus to control the physical properties of PP products finally. The progress of external donor and dual external donor mixed based silane technology for Z-N catalyst in propylene polymerization were reviewed

and the application of the said external donor and dual external donor mixed for new production were also reviewed.