Polybutadiene and process for producing the same
AssigneeUbe Industries, Ltd.
InventorsMichinori Suzuki, Masato Murakami
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Abstract
Modified polybutadiene having a high-cis and low-trans structure with a moderate 1,2-structure content and exhibiting improved characteristics such as cold flow properties, which is obtained by modifying starting polybutadiene having a Tcp/ML1+4 ratio (Tcp: 5% toluene solution viscosity at 25° C.ML1+4: Mooney viscosity at 100° C.) of 2.5 or more in the presence of a transition metal catalyst.
Claims6
A process for producing modified polybutadiene comprising preparing starting polybutadiene having a Tcp/ML1+4 ratio of 2.5 or more, wherein Tcp is a 5% toluene solution viscosity at 25° C., and ML1+4 is a Mooney viscosity at 100° C., by using a polymerization catalyst system comprising (A) a metallocene type complex of a transition metal and (B) at least one of (B1) an ionic compound composed of a non-coordinating anion and a cation and (B2) an aluminoxane and modifying said starting polybutadiene by addition of a transition metal catalyst.
A process for producing modified polybutadiene comprising preparing starting polybutadiene having a Tcp/ML1+4 ratio of 2.5 or more, wherein Tcp is a 5% toluene solution viscosity at 25° C., and ML1+4 is a Mooney viscosity at 100° C., by using a polymerization catalyst system comprising (A) a metallocene type complex of a transition metal, (B1) an ionic compound composed of a non-coordinating anion and a cation, (C) an organometallic compound of an element of the group 1 to 3 of the Periodic Table, and (D) water and modifying said starting polybutadiene by addition of a transition metal catalyst.
Dependencies are inferred from the claim text.