Ethylene and butadiene copolymer having a homogeneous microstructure
AssigneeCompagnie Generale Des Etablissements Michelin
InventorsNuno Pacheco, Julien Thuilliez
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Abstract
An ethylene/butadiene copolymer comprising statistically distributed ethylene units and butadiene unit is provided. The molar fraction of the ethylene units in the copolymer is greater than or equal to 50%, relative to the total number of moles of ethylene and butadiene units. The microstructure of the copolymer is homogeneous. A process for preparing such a copolymer and also the uses of this copolymer, in particular in rubber compositions for tires is also provided.
Claims10
A semi-continuous process for preparing an ethylene/butadiene copolymer, the ethylene/butadiene copolymer comprising statistically distributed, ethylene units and butadiene units, a molar fraction of ethylene units in the copolymer being greater than or equal to 50%, relative to the total number of moles of ethylene and butadiene units, wherein the copolymer has a homogeneous microstructure and thus the molar concentration of each of the units is constant all along the chain of the copolymer, the process comprising a solution polymerization, in a hydrocarbon solvent, at a temperature of between 0° C. and 200° C., of ethylene and butadiene in the presence of a catalytic system, in a stirred reactor, wherein the polymerization is carried out at constant temperature and at constant ethylene pressure and constant butadiene pressure, wherein the ethylene and butadiene are injected continuously into the reactor and wherein, in the reaction medium, at each instant of polymerization, ethylene and butadiene concentrations are constant.
A tire comprising an ethylene/butadiene copolymer, the ethylene/butadiene copolymer comprising statistically distributed, ethylene units and butadiene units, a molar fraction of ethylene units in the copolymer being greater than or equal to 50%, relative to the total number of moles of ethylene and butadiene units, wherein the copolymer has a homogeneous microstructure and thus the molar concentration of each of the units is constant all along the chain of the copolymer, and the ethylene/butadiene copolymer obtained by a process comprising a solution polymerization, in a hydrocarbon solvent, at a temperature of between 0° C. and 200° C., of ethylene and butadiene in the presence of a catalytic system, in a stirred reactor, wherein the polymerization is carried out at constant temperature and at constant ethylene pressure and constant butadiene pressure, wherein the ethylene and butadiene are injected continuously into the reactor and wherein, in the reaction medium, at each instant of polymerization, ethylene and butadiene concentrations are constant.
A tire comprising an ethylene/butadiene copolymer, the ethylene/butadiene copolymer comprising statistically distributed, ethylene units and butadiene units, a molar fraction of ethylene units in said copolymer being greater than or equal to 50%, relative to the total number of moles of ethylene and butadiene units, wherein said copolymer has a homogeneous microstructure and thus the molar concentration of each of the units is constant all along the chain of said copolymer.
Dependencies are inferred from the claim text.