Gas-phase polymerisation of conjugated dienes in the presence of rare earth allyl compounds

US5958820A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rudolf Taube · Freising, DE
• Steffen Maiwald · Merseburg, DE
• Thomas Ruhmer
• Heike Windisch · Leverkusen, DE
• Jurgen Giesemann · Bodenwerder, DE
• Gerd Sylvester · Leverkusen, DE

Key dates

• Filing date: Oct 2, 1997
• Grant date: Sep 28, 1999
• Expiry date: Oct 2, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F36/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for polymerizing a gaseous conjugated diene by bringing it in contact with a catalyst consisting of a rare earth allyl compound, an organic aluminum compound, an inorganic support and optionally, the same or a different conjugated diene. The resulting polymers possess elevated proportions of cis-1,4 units.