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Combining Ziegler‐Natta and mettalocene catalysis: New heterophasic propylene copolymers from the novel multicatalyst reactor granule technology
Author(s) -
Galli P.,
Collina G.,
Sgarzi P.,
Baruzzi G.,
Marchetti E.
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19971128)66:9<1831::aid-app22>3.0.co;2-w
Subject(s) - copolymer , materials science , polymer , polymerization , catalysis , ziegler–natta catalyst , polymer chemistry , granule (geology) , porosity , chemical engineering , natural rubber , morphology (biology) , polymer science , composite material , chemistry , organic chemistry , engineering , biology , genetics
A new process that combines the excellent morphology control of Ti‐based catalysts with the unique features of polyolefins from mettalocenes has been devised. First, propylene is polymerized with the Ti‐based catalysts, having spherical form; then, activated mettalocene catalysts are introduced into the porous PP spheres, through an in situ impregnation and drying process, once the Ti has been deactivated. Then, the olefins polymerization, catalyzed by the mettalocene, is carried out in gas phase. This step, as well as the morphology of the as‐polymerized polymer particles, has been investigated in detail. New heterophasic copolymers (PP/EPR) having free‐flowing spherical form have been achieved, and the morphology of the copolymer spheres pointed out that the rubber is well dispersed inside the polymer granule. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 1831–1837, 1997