Sumitomo Chemical Company, Limited

Tokyo Institute of Technology

Bridgestone Corporation

Kohtaro Osakada

Daisuke Takeuchi

Sehoon Park

Masayuki Fujita

Osamu Ihata

Makoto Uemura

Shojiro Kaita

Shinji Yamakawa

Hirofumi Johoji

Wataru Hirahata

Shigenaga Takano

Hiroshi Kuribayashi

Yusuke Fukuda

Kenji Sogo

Ryuichi Matsuura

Provided is novel polybutadiene having high isotacticity. The polybutadiene has a triad isotacticity (mm) of 72% or more.

Polybutadiene, method of producing polybutadiene, polybutadiene composition, tire, and resin member

To provide a catalyst composition having high polymerization activity. To provide a polymer manufacturing method. To provide a polymer manufactured by the polymer manufacturing method. To provide a rubber composition including the polymer. To provide a tire using the rubber composition. A catalyst composition including a compound represented by Structural Formula I below, wherein the compound has an OH group at at least one position of the bipyridyl ring; M is a transition metal, a lanthanoid, scandium, or yttrium; Rand Rare a hydrocarbon group having one or more carbon atoms or a halogen atom; and Rand Rmay be the same or different from each other. A polymer manufacturing method including a step of polymerizing one or more selected from the group consisting of a conjugated diene compound and a compound having an ethylenically unsaturated double bond in the presence of the catalyst composition. A polymer manufactured by the manufacturing method. A rubber composition including the polymer. A tire using the rubber composition. 

Polymerization catalyst composition, polymer manufacturing method, polymer, rubber composition, and tire

A polymer and a method for producing same are provided, which includes a repeating unit represented by the following formula (1): wherein: each of A, A, A, and Aindependently represents a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an aryl group, a silyl group, a siloxy group, an alkoxy group, an aralkyloxy group, an aryloxy group, an amino group, an amide group, an imide group, or a hydrocarbon thio group; each of A, A, A, and Ais independently any of these groups at different carbons to which the each of A, A, A, and Ais bonded, and A, A, A, and Amay be bonded to each other; and each of m, n, and k is independently an integer in a range of 2 to 20.

Polymer and method for producing same

A copolymer and method for providing it are provided, which includes a monomer unit represented by the following formula (1) and an olefin unit: wherein: each of A, A, A, and Aindependently represents a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an aryl group, a silyl group, a siloxy group, an alkoxy group, an aralkyloxy group, an aryloxy group, an amino group, an amide group, an imide group, or a hydrocarbon thio group; which group may have a substituent; and each of m, n, and k is independently an integer in a range of 2 to 20.

Copolymer and method for producing same

A homopolymer having a monomer unit such as an isopropylidene diallylmalonate unit; a process for producing said homopolymer comprising the step of homopolymerising a monomer such as isopropylidene diallylmalonate; a copolymer containing said monomer unit and an ethylene unit and/or &#x3b1;-olefin unit; and a process for producing said copolymer comprising the step of copolymerizing a monomer such as isopropylidene diallylmalonate with at least ethylene and/or an &#x3b1;-olefin.

Copolymer and production process thereof

A polymer comprising a unit represented by the following formula (1); and a process for producing the polymer comprising the step of polymerizing a diene compound such as 9,9-diallylfluorene in the presence of a polymerization catalyst formed by contacting a nickel compound with an organoaluminum compound and/or a boron compound: 

Diene polymer and production process thereof

Homopolymer and copolymer, and production process thereof

A copolymer containing units represented by the defined formula (1) and olefin units; and a process for producing the copolymer, which comprises the step of copolymerizing a compound represented by the defined formula (3) with an olefin, the units represented by the formula (1) being polymerized units of the compound represented by the formula (3) such as 5,5-diallyl-2,2-dimethyl-1,3-dioxane.

Olefin-diene copolymer and process for producing the same

A polymer containing units represented by the defined formula (1); and a process for producing the polymer, which comprises the step of polymerizing a compound represented by the defined formula (3), the units represented by the formula (1) being polymerized units of the compound represented by the formula (3) such as 9,9-diallylfluorene.

Diene polymer and process for producing the same

A polymer containing units represented by the defined formula (1); and a process for producing the polymer, which comprises the step of polymerizing a compound represented by the defined formula (3), the units represented by the formula (1) being polymerized units of the compound represented by the formula (3) such as 1,6-heptadiene.

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Yokohama, Japan

Kohtaro Osakada