National Institute of Advanced Industrial Science and Technology

Other

Tonen Chemical Corporation

Japan Chemical Innovation Institute

Hideaki Hagihara

Kenji Tsuchihara

Hiroyuki Ozaki

Masahide Murata

Michihiko Asai

Masanao Kawabe

Toshio Kase

Yoshifumi Fukui

Akira Miyazawa

Yasuzo Suzuki

Takeshi Ishihara

The Ban Hoang

Kazuo Soga

Takeshi Shiono

Jizhu Jin

Ban The Hoang

Jizhy Jin

Hisae Soga

The present invention provides a new copolymer of propylene and a conjugated diene having a carbon-carbon double bond in a side chain, wherein a molar ratio of a total of 1,2-adducts and 3,4-adducts to 1,4-adducts, derived from the conjugated diene, is 100:0. The copolymer is prepared in a process, characterized in that propylene and the conjugated diene are copolymerized in the presence of hydrogen, an organometallic compound comprising a transition metal selected from the group 4 of the periodic table, and at least one Lewis acid.

Copolymer of propylene with a conjugated diene and a process of preparing the same

A syndiotactic styrenic polymer having a narrow molecular weight distribution which is a (co)polymer comprising at least one structural unit represented by the following Formula (1):wherein Cof a phenyl group thereof has a tacticity of 30% or more in terms of a racemic pentad determined byC-NMR, and Rand m are as defined in the specification. The disclosure is also directed to a block copolymer comprising the above polymer as one segment, to a block graft polymer prepared by modifying one block of the above polymer with a nitrogen-containing aromatic polymer, and to a process for preparing a syndiotactic styrenic polymer in which a styrenic monomer is polymerized in the presence of a catalyst comprising a reaction product of a transition metal compound and at least one co-catalyst selected from organic aluminunoxy compounds.

Syndiotactic styrene polymers and process for the production thereof

A butadiene polymer (i) having a cis bond unit content of at least 50% based on the total butadiene units, a number average molecular weight (Mn) of 1,000 to 10,000,000, and at least 80%, based on the total molecular chains, of living chains containing a transition metal of group IV of the Periodic table at a terminal thereof; a polymer (ii) obtained by modifying terminals of the polymer (i); and a polymer (iii) obtained by coupling the polymers (i). These polymers (i), (ii) and (iii) are obtained by polymerizing a conjugated diene monomer alone or with a copolymerizable monomer at a specific temperature in the presence of a catalyst comprising a compound (A) of a transition metal of group IV of the periodic table having a cyclopentadienyl structure and a co-catalyst (B) selected from organoaluminum-oxy compound (a) and others and optionally further by contacting the resultant polymer with a terminal modifier or a coupling agent.

Butadiene polymers and process for producing conjugated diene polymers

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Ibaraki, Japan

Hideaki Hagihara