National Institute of Advanced Industrial Science and Technology

Other

Sekisui Chemical Co., Ltd.

Tonen Chemical Corporation

Japan Chemical Innovation Institute

Kenji Tsuchihara

Hiroyuki Ozaki

Masahide Murata

Michihiko Asai

Masanao Kawabe

Akira Miyazawa

Toshio Kase

Yoshifumi Fukui

Yasuzo Suzuki

Hideaki Hagihara

Kazuo Soga

Takeshi Shiono

Jizhu Jin

Hideaki Hagiwara

Takeshi Ishihara

The Ban Hoang

Kazuyuki Yahara

Ban The Hoang

Jizhy Jin

Yoshihumi Fukui

Yasuzou Suzuki

Naoya Kishi

Hisae Soga

An acetylene-based polymer, comprising n recurring units represented by the following Formula (1):CH&#x2550;CA&#x2003;&#x2003;(1)wherein, n is an integer of 10 to 10,000; each A represents a group selected from a naphthyl group, a phenanthryl group, a pyrenyl group and an anthryl group, which is mono- or di-substituted with a group selected from alkyl groups, alkyl groups substituted with aromatic hydrocarbon groups, R&#x2014;O&#x2014; groups, &#x2014;S&#x2014;Rgroups, &#x2014;NRRgroups, a cyano group, a carboxyl group, RSO&#x2014; groups, &#x2014;COORgroups, &#x2014;CON(R)(R) groups and &#x2014;CORgroups (each of R, R, Rand Ris an alkyl group, each of R, R, R, Rand Ris a hydrogen atom or an alkyl group); and the recurring units may be the same as or different from each other.

Acetylene-based polymer

The present invention aims to provide a light control material capable of optionally controlling the light transmittance in an arbitrary wavelength range among a wide wavelength range, and a light control film formed by using the light control material.

Light control material and light control film

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 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 catalyst comprising an organoaluminum compound and a vanadium chelate compound having the lability to cause olefins to undergo living coordination polymerization is contacted with a terminal diolefin to obtain a catalyst for living polymer production. When the above contact is:conducted in the presence of a cycloolefin or an internal olefin, the yield of a living polymer can be improved. By modifying all ends of the living polymer obtained, a telechelic olefin polymer is obtained in which all the polymer chains are modified with functional groups.

Catalyst for producing living olefin polymer and process for producing the polymer

Growing community of inventors

Tsukuba, Japan

Kenji Tsuchihara