Formation of sp3-C1-Bridged Cp/Amido Titanium and Zirconium “CpCN” Constrained-Geometry Ziegler−Natta Catalyst Systems

2002 ◽  
Vol 21 (6) ◽  
pp. 1031-1041 ◽  
Author(s):  
Klaus Kunz ◽  
Gerhard Erker ◽  
Steve Döring ◽  
Stephane Bredeau ◽  
Gerald Kehr ◽  
...  
Keyword(s):  
Constrained Geometry ◽  
Natta Catalyst ◽  
Catalyst Systems ◽  
Ziegler Natta Catalyst

A New Class of Ethylene—Propylene—Diene Terpolymers Produced from Constrained Geometry Metallocene Catalysts

2001 ◽  
Vol 74 (4) ◽  
pp. 688-700 ◽  
Author(s):  
Kim L. Walton ◽  
Morgan M. Hughes ◽  
Deepak R. Parikh
Keyword(s):  
Catalyst Activity ◽  
Barrier Properties ◽  
Unique Combination ◽  
Process Technology ◽  
Ethylene Propylene ◽  
Green Strength ◽  
Constrained Geometry ◽  
Natta Catalyst ◽  
Catalyst Systems ◽  
Ziegler Natta Catalyst

Abstract Until recently, ethylene/propylene/diene (EPDM) terpolymers have been manufactured exclusively using vanadium based Ziegler—Natta catalyst systems. The vanadium based catalysts are known to have both product and process limitations. These limitations are due to a complex combination of factors including monomer reactivity, catalyst activity, reactor temperatures and pressures. Single-site metallocene constrained geometry catalyst (CGC) technology enables the manufacture of EPDM terpolymers at higher reactor temperature and catalyst efficiency than standard Ziegler—Natta catalyst systems. The unique combination of monomer, catalyst and process technology enables the manufacture of highly crystalline EPDMs having ethylene contents over 90 wt %. This study investigated these new highly crystalline EPDM terpolymers and their differentiation from commercially available EPDMs. The results indicated that these new EPDMs had very high green strength and barrier properties, yet could be cured by conventional vulcanization techniques. The cure response of these EPDMs to either peroxide or sulfur increased with increasing ethylene content. Sulfur cured vulcanizates had much higher tensile strength than peroxide cured vulcanizates. These new EPDMs demonstrated utility as additives to enhance the abrasion, hot tear, and tensile properties of natural rubber compounds. Sponge compounds, having the unique combination of polyethylene physical properties and the utility of sulfur vulcanization were developed from these new polymers.

The nature of the active centres in Ziegler-Natta catalyst systems

1975 ◽  
Vol 17 (2) ◽  
pp. 355-365 ◽  
Author(s):  
O.A Ponomarev ◽  
K.S Minsher ◽  
V.M Pshenichnirov ◽  
Yu.A Sangalov
Keyword(s):  
Natta Catalyst ◽  
Catalyst Systems ◽  
Active Centres ◽  
Ziegler Natta Catalyst

Generation of Homogeneous (sp3-C1)-Bridged Cp/Amido and Cp/Phosphido Group 4 Metal Ziegler−Natta Catalyst Systems

2001 ◽  
Vol 123 (25) ◽  
pp. 6181-6182 ◽  
Author(s):  
Klaus Kunz ◽  
Gerhard Erker ◽  
Steve Döring ◽  
Roland Fröhlich ◽  
Gerald Kehr
Keyword(s):  
Group 4 ◽  
Natta Catalyst ◽  
Catalyst Systems ◽  
Group 4 Metal ◽  
Ziegler Natta Catalyst

Effect of alkylaluminum structure on Ziegler-Natta catalyst systems based on neodymium for producing high-cis polybutadiene

2008 ◽  
Vol 62 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Tereza C. J. Rocha ◽  
Fernanda M. B. Coutinho ◽  
Bluma G. Soares
Keyword(s):  
Natta Catalyst ◽  
Catalyst Systems ◽  
Ziegler Natta Catalyst
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