Activation of catalytic systems for the stereospecific polymerization of dienes
AssigneesCompagnie Generale Des Establissements Michelin, Michelin Recherche et Technique S.A.
InventorsJulien Thuilliez, Olivier Rolland
Life of this patent
Estimating the term…
Abstract
An activated preformed catalytic system for the 1,4-cis stereospecific polymerization of conjugated dienes based on at least: one or more preformation conjugated diene monomers, one or more salts of one or more rare-earth metals of one or more acids chosen from an organic phosphoric acid and an organic carboxylic acid, and a mixture thereof, one or more alkylating agents consisting of one or more alkylaluminiums of formula AlR3 or HAlR2, in which R represents an alkyl radical and H represents a hydrogen atom, one or more halogen donors consisting of an alkylaluminium halide, and one or more compounds corresponding to formula (I) below:
Claims19
An activated preformed catalytic system for the 1,4-cis stereospecific polymerization of conjugated dienes based on at least:
- one or more preformation conjugated diene monomers,
- one or more salts of one or more rare-earth metals of one or more acids chosen from an organic phosphoric acid, an organic carboxylic acid and a mixture thereof, the mole ratio of the conjugated diene monomer to the rare-earth metal salt being at least 10
- one or more alkylating agents consisting of one or more alkylaluminiums of formula AlR3 or HAlR2, in which R represents an alkyl radical and H represents a hydrogen atom,
- one or more halogen donors consisting of an alkylaluminium halide, and
- one or more compounds corresponding to formula (I) below:
- wherein the groups R1 to R6, which may be identical or different, are chosen from a hydrogen atom, a linear or branched, saturated or unsaturated aliphatic alkyl, cycloaliphatic or aromatic radical, on condition that at least one of the groups R1 to R6 does not denote a hydrogen atom.
Dependencies are inferred from the claim text.