Process and catalyst for the preparation of syndiotactic 1,2,-polybutadiene

US4751275A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Josef Witte · Cologne, DE
• Gerd Sylvester · Leverkusen, DE
• Bernd Stollfuss · Bensberg, DE

Key dates

• Filing date: Oct 16, 1986
• Grant date: Jun 14, 1988
• Expiry date: Oct 16, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/903
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Syndiotactic 1,2-polybutadiene of high quality may be obtained in excellent yield by solution polymerization of butadiene-(1,3) in hydrocarbons, using organometallic mixed catalysts composed of trialkylaluminium, hydrocarbon-soluble chromium-III compounds and a dialkylphosphite corresponding to the formula ##STR1## wherein R denotes straight chained or branched C.sub.1 -C.sub.8 -alkyl and PA1 R.sub.1, R.sub.2 and R.sub.3 denote methyl or ethyl or PA1 R and R.sub.1 together form a methylene group.