Process for the manufacture of branched polypropylene

Details Process for the manufacture of branched polypropylene Process for the manufacture of branched polypropylene

2011-03-29

2011-03-29

Lu, Caixia (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S129000, C526S160000, C526S165000, C526S348000

Reexamination Certificate

active

07915367

ABSTRACT:
A process for manufacturing a branched polypropylene, said branched polypropylene having a branching index g′ of less than 1.00, the process comprising the step of polymerizing propylene and optionally one or more other comonomers under non-supercritical conditions in a reaction vessel, wherein:c. the pressure during the polymerization of propylene and optionally one or more other comonomers in said reaction vessel is at least 45.4 bar;d. the temperature during the polymerization of propylene and optionally one or more other comonomers in said reaction vessel is below 90° C.; andc. the polymerization of propylene and optionally one or more other comonomers is conducted in said reaction vessel in the presence of a catalyst system having a surface area of not more than 350 m2/g, measured according to ISO 9277, and said catalyst system comprises a metallocene catalyst having zirconium as the transition metal.

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