Bifunctional alkali metal compounds, preparation and use thereof as polymerization initiators

US4861742A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Bronstert · Eisenberg (Pfalz), DE
• Siegbert Bohnet · Mannheim, DE
• Walter Himmele · Monsheim, DE
• Kaspar Bott · Mannheim, DE

Key dates

• Filing date: Sep 1, 1988
• Grant date: Aug 29, 1989
• Expiry date: Sep 1, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F4/46
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Bifunctional initiators for anionic polymerization are prepared by reacting an alkenylaromatic compound of the general formula I ##STR1## where Ar is aromatic hydrocarbyl which may be substituted by alkyl or another group inert toward organoalkali metal compounds and may contain nitrogen, PA1 R.sup.1 is linear or branched alkyl, cycloalkyl, alkenyl or aralkyl or from 1 to 22 carbon atoms where at least the carbon adjacent to the double bond is saturated and aliphatic, PA1 R.sup.2 is hydrogen or is likewise linear or branched alkyl, cycloalkyl, alkenyl or aralkyl or from 1 to 22 carbon atoms where at least the carbon adjacent to the double bond is saturated and aliphatic, and where R.sup.1 and R.sup.2 may be part of a common cycloaliphatic ring, in the presence of one or more ethers and of tertiary amines and in the presence or absence of a further inert aliphatic, alicyclic or aromatic solvent, at from -20.degree. to +70.degree. C. with preferably lithium and with dimerization, with the use in addition of poly-cyclic aromatic hydrocarbons which catalytically promote the dimerization in amount of from 0.001 to 50, preferably 20, mol % and with or without the removal of the ethers an…