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AssigneesCompagnie General des Etablissments Michelin, Centre National De La Recherche Scientifique, Ecole Superieure De Chimie Physique Electronique De Lyon, Universite Claude Bernad Lyon 1
InventorsEmma Moreso, Julien Thuilliez, François Jean-Baptiste-Dit-Dominique, Christophe Boisson, Franck D'Agosto, Nicolas Baulu, Damien Montarnal
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A diblock polymer composed of a first block and a second block is provided. The first block is a statistical copolymer comprising units of a 1,3-diene and more than 50 mol % of ethylene units. The second block is a polyethylene with a melting point above 90° C. and a number-average molar mass greater than or equal to 2000 g/mol and less than or equal to 10 000 g/mol. Such a diblock polymer has improved rheology compared to a statistical copolymer of the same microstructure and of the same macrostructure as the first block of the diblock polymer.
A diblock polymer composed of a first block and a second block, the first block being a statistical copolymer comprising units of a 1,3-diene and more than 50 mol % of ethylene units, the second block being a polyethylene with a melting point above 90° C. and a number-average molar mass greater than or equal to 2000 g/mol and less than or equal to 10 000 g/mol, wherein the 1,3-diene is 1,3-butadiene or a mixture of 1,3-dienes, one of which is 1,3-butadiene, and the first block contains 1,2-cyclohexanediyl units or 1,4-cyclohexanediyl units.
A diblock polymer composed of a first block and a second block, the first block being a statistical copolymer comprising units of a 1,3-diene and more than 50 mol % of ethylene units, the second block being a polyethylene with a melting point above 90° C. and a number-average molar mass greater than or equal to 2000 g/mol and less than or equal to 10 000 g/mol, wherein the units of the 1,3-diene in a 1,2 configuration and the units of the 1,3-diene in a 3,4 configuration represent more than 50 mol % of the units of the 1,3-diene.
A process for preparing a diblock polymer, the diblock polymer composed of a first block and a second block, the first block being a statistical copolymer comprising units of a 1,3-diene and more than 50 mol % of ethylene units, the second block being a polyethylene with a melting point above 90° C. and a number-average molar mass greater than or equal to 2000 g/mol and less than or equal to 10 000 g/mol, and the process including a statistical copolymerization of a monomer mixture containing ethylene and a 1,3-diene, then the subsequent polymerization of ethylene, wherein a catalytic system based at least on a metallocene of formula (I) and an organomagnesium compound is used
Dependencies are inferred from the claim text.