New Isotactic Polypropylenes via Metallocene Catalysts

  • W. Spaleck
  • M. Antberg
  • M. Aulbach
  • B. Bachmann
  • V. Dolle
  • S. Haftka
  • F. Küber
  • J. Rohrmann
  • A. Winter

Abstract

Chiral bridged bisindenyl zirconoeenes with special substitution patterns on the aromatic rings are potentially commercial catalysts for the production of isotactic polypropylenes. The performance characteristics of these systems are different, the variations being induced by size and position of the substituents. The novel catalysts will be used for the production of new iPP grades with enhanced properties or unprecedented property combinations. Typical features of metailocene iPP polymers are higher stiffness, higher transparency, and a lower level of extractables than conventional products. The most recent new designs of metailocene PP catalysts are discussed. These include asymmetric systems and metallocenes inducing two-step-polymerization mechanisms.

Keywords

Zirconium Silane Hexane Toluene Propylene 

List of Abbreviations and Symbols

aPP

atactic polypropylene

Bz

benzyl

c2

ethylene

Dmax

maximum of loss factor

∆H

melting enthalpy

ED

electron donor

Et

ethyl

Ind

indenyl

iPP

isotactic polypropylene

Me

methyl

mmmm

percentage of isotactic pentades

Mn

molecular mass (number average)

m.p.

melting point

Mw

molecular mass (weight average)

MWD

molecular weight distribution

Ph

phenyl

t-Bu

tert-butyl

Tg

glass transition temperature

Tm

melting point

TP

polymerization temperature

tP

polymerization time

wt%

weight percent

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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • W. Spaleck
    • 1
  • M. Antberg
    • 1
  • M. Aulbach
    • 1
  • B. Bachmann
    • 1
  • V. Dolle
    • 1
  • S. Haftka
    • 1
  • F. Küber
    • 1
  • J. Rohrmann
    • 1
  • A. Winter
    • 1
  1. 1.Hoechst AGFrankfurt a. M.Germany

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