| 摘要 |
<p>Process for the manufacture of a branched polypropylene having a branching index g' of less than 1.00, wherein the process comprises the step of polymerizing propylene and optionally another (other) comonomer(s) under non-supercritical conditions in a reaction vessel, characterized in that
a. the pressure during the polymerization of propylene and optionally another (other) comonomer(s) in said reaction vessel is a at least 45,4 bar,
b. the temperature during the polymerization of propylene and optionally another (other) comonomer(s) in said reaction vessel is below 90 °C and
c. the polymerization of propylene and optionally another (other) comonomer(s) is conducted in said reaction vessel in the presence of a catalyst system having surface area of not more than 350 m 2 /g measured according to ISO 9277 and said catalyst system comprises a metallocene catalyst having zirconium as the transition metal.</p> |
