Process for the preparation of substantially amorphous...

C - Chemistry – Metallurgy – 08 – F

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C08F 10/00 (2006.01) C07C 2/86 (2006.01) C07C 13/465 (2006.01) C08L 23/10 (2006.01) C08L 23/14 (2006.01) C08F 4/619 (2006.01)

Patent

CA 2302287

Amorphous polymers of alpha-olefins, particularly of propylene, having high molecular weights and narrow molecular weight distributions, in which the isotactic sequences are more abundant than the syndiotactic ones, can be obtained in high yields at temperatures of industrial interest by carrying out the polymerization reaction in the presence of metallocene catalysts comprising particular bridged bis-indenyl compounds substituted in the 3- position on the indenyl groups. The obtained amorphous polymers are particularly useful for the preparation of miscible compositions with substantially isotactic alpha-olefins.

L'invention concerne des polymères amorphes d'alpha-oléfines, en particulier du type propylène, ayant une masse moléculaire élevée et des distributions de masse moléculaire restreintes, dans lesquels les séquences isotactiques sont plus abondantes que les séquences syndiotactiques. On peut élaborer lesdits polymères selon un haut rendement, à des températures qui présentent de l'intérêt pour l'industrie, en conduisant une réaction de polymérisation en présence de catalyseurs à base d'alliage organométallique qui renferment des composés particuliers bis-indényle pontés à substitution en position 3 sur les groupes indényle. Les polymères amorphes considérés sont particulièrement utiles pour l'élaboration de compositions miscibles avec des alpha-oléfines sensiblement isotactiques.

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