The key technologies for the production of high-end polypropylene

including capacitor film substrate iPP

are the highly active catalysts and the advanced polymerization processes for high isotactic polymerization of propylene. In this paper

an overview of the development of polymerization catalyst for the polypropylene

including highly efficient Ziegler-Natta catalysts

metallocene catalysts and non-metallocene catalysts

is introduced in detail. The prons and cons of such three types of catalysts for synthesis of iPP that is used in the production of capacitors are pointed out. The recent development of the catalysts for olefin polymerization is described. A new theory of introducing electron withdrawing group in the catalytic structure and component which is conductive to improving the catalyst activity and the molecular weight of polyolefin. A new generation of olefin polymerization catalysts

including propylene polymerization catalysts with internal and external electron donors in the same molecule and all-heterocyclic metal-organic catalysts

has been developed. A new concept of the reversible complexing-opening coordination polymerization (RCOCP) for synthesizing olefin block copolymers is proposed. Based on the advanced propylene polymerization process in combination with the strict requirements of technical data of iPP for the capacitor film substrate material

the main factors generating ash from polypropylene powder and grains are analyzed. The new production method that the composite organic solvent washing process is applied before the inactivation of polypropylene powder is set up so to produce the qualified high-end capacitor film substrate iPP.