Other

National Institute of Advanced Industrial Science and Technology

Agency of Industrial Science and Technology

Ministry of International Trade & Industry

Japan Chemical Innovation Institute

Yasuzo Suzuki

Hiroyuki Ozaki

Masahide Murata

Michihiko Asai

Masanao Kawabe

Toshio Kase

Kenji Tsuchihara

Yoshifumi Fukui

Akira Miyazawa

Hideaki Hagihara

Kazuo Soga

Jizhu Jin

Kunihiro Ichimura

Hideaki Hagiwara

The Ban Hoang

Takashi Tamaki

Takahiro Seki

Takeshi Shiono

Masako Sakuragi

Koso Aoki

Akira Hosoki

Hisae Soga

Jizhy Jin

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

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

A photorecording element is disclosed which consists of a transparent substrate, a molecular layer of an organic compound with an ability to change structure reversibly by virtue of light and disposed in direct contact with the transparent substrate, and a layer of liquid crystals disposed in direct contact with the molecular layer. A liquid crystal cell comprising the photorecording element is also disclosed. A modification having fine deformations on the surface of the transparent substrate and a modification having a dichroic dye contained in the layer of liquid crystals are embraced by the present invention.

Photorecording element and liquid crystal cell comprising the same

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Tsukuba, Japan

Yasuzo Suzuki