Preparation of polyisoprene having high content of 1,2- and 3,4-structural units by anionic polymerization

US4894425A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Walter Hellermann · Dorsten, DE
• Karl-Heinz Nordsiek
• Jurgen Wolpers · Bochum, DE

Key dates

• Filing date: May 29, 1987
• Grant date: Jan 16, 1990
• Expiry date: May 29, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/914
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyisoprenes having a high content of 1,2- and 3,4-structural units, a process for their preparation, and their use. The previous processes for the preparation of polyisoprene having a high content of 1,2- and 3,4-structural units were still unsatisfactory in terms of the cocatalyst employed. The use of ethylene glycol dialkyl ethers of the formula EQU R.sub.1 --O--CH.sub.2 --CH.sub.2 --O--R.sub.2 in which R.sub.1 and R.sub.2 are alkyl groups having different numbers of C atoms, from the group consisting of methyl, ethyl, n- and isopropyl and n-, iso-, sec.- and tert.-butyl, has, in particular, the advantage that the "living polymers" formed during the anionic polymerization are not damaged. The production of tires and damping elements using these polyisoprenes.