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National Institute of Advanced Industrial Science and Technology

Japan Chemical Innovation Institute

Jizhu Jin

Hiroyuki Ozaki

Masahide Murata

Michihiko Asai

Masanao Kawabe

Toshio Kase

Kenji Tsuchihara

Yoshifumi Fukui

Akira Miyazawa

Yasuzo Suzuki

Hideaki Hagiwara

The Ban Hoang

Kazuo Soga

Hideaki Hagihara

Takeshi Shiono

Hisae Soga

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 process for preparing olefinic living polymers having a molecular weight distribution (Mw/Mn) of 1 to 1.3, comprising polymerizing an olefinic monomer having 2 to 20 carbon atoms at low temperatures in the presence of a catalyst comprising (A) a hafnium or zirconium-containing compound having one or two cyclopentadienyl backbones, (B) a triphenyl boron compound or a tetraphenyl borate compound and optionally (C) a specific mono-, di- or trialkylaluminum compound. When the catalyst comprising the zirconium-containing compound is prepared by further using a titanium-containing compound (D), the polymerization temperature can be raised.

Process for producing olefin living polymer

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Jizhu Jin