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Metallocene Catalysts for 1-Butene Polymerization

✍ Scribed by Luigi Resconi; Isabella Camurati; Federica Malizia

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
397 KB
Volume
207
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: Isotactic polybutenes of variable isotacticity and melting points of form I in the range 100–125 °C have been prepared with both C~2~‐ and C~1~‐symmetric zirconocenes. The C~1~‐symmetric zirconocenes bearing the bilateral symmetric 2,5‐dimethyl‐7__H__‐cyclopenta[1,2‐b:4,3‐b′]dithiophene ligand connected by a dimethylsilandiyl bridge to a substituted indenyl ligand produce iPB with higher molecular mass, up to 400 000 at polymerization temperature of 70 °C in liquid butene. The degree of isotacticity depends on the substitution pattern of the indenyl ligand. The correlations between microstructure and melting points of the crystalline forms I and II of iPB have been defined. Some relevant differences in catalyst selectivity between propylene and 1‐butene polymerizations have been identified.

Linear correlation of melting points of form I and form II in isotactic poly(1‐butene)s of different chain regularities.

magnified imageLinear correlation of melting points of form I and form II in isotactic poly(1‐butene)s of different chain regularities.

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The figure shows the general structure of the C 1 -symmetric zirconocenes investigated in this work. We would like to apologize for any inconvenience this mistake may have caused.

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