Premium
Novel binary chlorides containing TiCl 3 as components of coordination catalysts for ethylene polymerization. II. Behavior of the resulting catalyst systems
Author(s) -
Greco A.,
Bertolini G.,
Bruzzone M.,
Cesca S.
Publication year - 1979
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/app.1979.070230506
Subject(s) - catalysis , ethylene , polymerization , cyclohexene , chemistry , polymer chemistry , polymer , ziegler–natta catalyst , inorganic chemistry , organic chemistry
Binary chlorides described in part I yielded very active catalyst systems for HDPE synthesis when they were associated with ( i ‐C 4 H 9 ) 3 Al. Very high initial polymerization rates were observed for systems bases on MnCl 2 ·TiCl 3 , MnCl 2 ·2TiCl 3 , or FeCl 2 ·2TiCl 3 (III), but high yields, i.e., above 30 kg polymer/g Ti, could be reached only using moderate pressure of ethylene. Hydrogen consumption during ethylene polymerization was observed in the case of catalysts based on AlCl 3 ·3TiCl 3 , CrCl 3 ·3TiCl 3 , and other binary chlorides containing elements of the VIII group. Relevant amounts of ethane were found in the case of systems III, V, and VIII. All the mixed chlorides studied were able to reduce cyclohexene in the presence of H 2 and ( i ‐C 4 H 9 ) 3 Al, even though with different kinetic courses. Compounds II, III, V, and VIII and (MgCl 2 ) 1.5 ·TiCl 3 and AlCl 3 ·3TiCl 3 were very active. The results have been explained on the basis of solubilization processes involving the heterogeneous catalysts which actually were experimentally verified during cyclohexene reduction. Analogous processes may occur also during HDPE synthesis.