Borstar polypropylene homopolymers

Borstar polypropylene homopolymers range from grades with a melt flow rate for pipe and sheet extrusion applications to very high flow specialty grades for melt blown applications. In conjunction with BNT it is possible to realize extremely stiff materials. 

Application The Borstar polypropylene (PP) process is a versatile technology. Through the choice of reactor combinations, homopolymers, random copolymers, heterophasic copolymers, and very high-rubber content heterophasic copolymers can be produced. 

Description Polypropylene with a melt flowrate ranging from 0.1 to 1,200 can be produced with the Borstar PP process. Currently, Ziegler Natta catalysts are used, but there is a potential to use single-site catalysts latter. When producing homopolymers and random copolymers, the process consists of a loop reactor and a gas-phase reactor in series. One or two gas-phase reactors are combined with this arrangement when heterophasic copolymers are produced. Propylene, catalyst, cocatalyst, donor, hydrogen, and comonomer... 

The Borstar PP process is based on the Borstar PE process. When homopolymers and random copolymers are produced, the reactor configuration consists of a propylene bulk loop reactor and a fluidized bed gas phase reactor operated in series. During hetero-phasic copolymer production, the polymer from the first gas phase reactor is transferred into a second smaller gas phase reactor where the rubbery copolymer is made. For bimodal rubber production a further gas phase reactor is necessary. Such a configuration allows for the production of polypropylenes with outstanding product properties. 

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