Title:
METHOD FOR PREPARING A DILITHIUM INITIATOR AND ANIONIC POLYMERISATION METHOD
Document Type and Number:
WIPO Patent Application WO2002020623
Kind Code:
A9
Abstract:
The invention concerns a method for preparing a dilithium initiator for use in anionic polymerisation, a method for preparing by anionic polymerisation a living diene elastomer provided with a carbon-lithium group at each of its chain ends, and a method for preparing a three-block copolymer from said living diene elastomer. The inventive method for preparing a dilithium initiator consists in reacting in an aliphatic or alicylic hydrocarbon solvent a first reagent consisting of a dialkenyl benzene and a second reagent consisting of secondary butyl lithium, so that the ratio of the number of moles of the first reagent over the number of moles of the second reagent is substantially equal to 0.5, and said method is characterised in that it consists in causing said reagents to react in the presence of a diamine, so that the resulting initiator essentially consists of a double adduct resulting from the addition of a secondary butyl lithium on each of the double bonds borne by said dialkenyl benzene.
Inventors:
ROBERT PIERRE (FR)
FRADIN-COHAS CORINNE (FR)
FRADIN-COHAS CORINNE (FR)
Application Number:
PCT/EP2001/009856
Publication Date:
September 19, 2002
Filing Date:
August 27, 2001
Export Citation:
Assignee:
MICHELIN SOC TECH (FR)
MICHELIN RECH TECH (CH)
ROBERT PIERRE (FR)
FRADIN-COHAS CORINNE (FR)
MICHELIN RECH TECH (CH)
ROBERT PIERRE (FR)
FRADIN-COHAS CORINNE (FR)
International Classes:
C08F4/48; C08F36/06; C08F297/02; C08F297/04; (IPC1-7): C08F4/48; C08F36/06; C08F297/02
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