Zeon Corporation

Kyoto University

Fumiaki Bando

Shigetaka Hayano

Shingo Okuno

Mitsuo Sawamoto

Makoto Ouchi

Yasuo Tsunogae

Shigeru Yamago

Tomoya Murase

Junichi Asano

Susumu Sato

An acrylic rubber composition includes an acrylic rubber and a specific antioxidant, wherein the acrylic rubber includes 15 to 55% by weight of methacrylic acid alkyl ester monomer units (a), 44.5 to 84.5% by weight of acrylic acid ester monomer units (b), and 0.5 to 4% by weight of carboxyl group-containing monomer units (c), and the content of the antioxidant is 0.1 to 5 parts by weight relative to 100 parts by weight of the acrylic rubber.

Acrylic rubber composition and rubber crosslinked product

An acrylic rubber containing acrylate monomer units, methacrylate monomer units, and crosslinkable monomer units, wherein a glass transition temperature is −20° C. or less, a change ratio in volume after a crosslinked rubber of the acrylic rubber is immersed in IRM903 oil at 150±2° C. for 72 hours is 0 to 100%, and a change ratio in weight after a crosslinked rubber of the acrylic rubber is immersed in hot water at 150±2° C. for 96 hours and dried is −5.0 to 0%.

Acrylic rubber, acrylic rubber composition, crosslinked acrylic rubber, seal material, and hose material

A binder composition for a non-aqueous secondary battery electrode contains a polymer A. The polymer A includes a nitrile group-containing monomer unit in a proportion of not less than 80.0 mass % and not more than 99.9 mass %, has a weight-average molecular weight (Mw) of not less than 700,000 and not more than 2,000,000, and has a molecular weight distribution (Mw/Mn) of less than 3.0.

Binder composition for non-aqueous secondary battery electrode, slurry composition for non-aqueous secondary battery positive electrode, positive electrode for non-aqueous secondary battery, and non-aqueous secondary battery

The present invention involves a radical polymerization initiator comprising an organotellurium compound represented by a formula (1), wherein Rrepresents an alkyl group or the like, each of Rand Rindependently represents a hydrogen atom or the like, and each of R, R, and Rindependently represents a hydrogen atom or the like. The present invention provides: a radical polymerization initiator that is useful for producing a polymer that includes a double bond at the molecular terminal; and a method for producing a polymer that utilizes the radical polymerization initiator. 

Radical polymerization initiator and method for producing polymers

A cyclopentene ring-opening polymer having, at a polymer chain end, a structure where a polymer chain and a group containing an alkoxysilyl group are bonded through &#x2014;NH&#x2014; and having a weight average molecular weight of 100,000 to 1,000,000, wherein the structure is a structure represented by the following general formula (1):pCP&#x2014;Y1-NH&#x2014;Y2-Si(OR1)a(R2)3-a&#x2003;&#x2003;(1)where, in the general formula (1), pCP represents a cyclopentene ring-opening polymer chain, Y1 represents a bivalent hydrocarbon group having 1 to 20 carbon atoms, each of R1 and R2 represents a hydrocarbon group having 1 to 20 carbon atoms, Y2 represents a bivalent hydrocarbon group having 1 to 20 carbon atoms in which &#x2014;NH&#x2014; may be interposed, and 'a' is an integer of 1 to 3.

Cyclopentene ring-opening polymer and method of production of same, polymer composition, and cross-linked polymer

The present invention is a method for producing a conjugated diene random copolymer comprising polymerizing at least a conjugated diene monomer using a living radical polymerization method to produce a conjugated diene polymer that comprises a halogen atom at a terminal of a polymer chain, a living radical polymerization reaction being initiated using a copper salt, a multidentate ligand that comprises a nitrogen atom having an sphybridized orbital as a coordinating atom, and an organic halide, to produce the conjugated diene polymer having a number average molecular weight (Mn) of 1,000 to 1,000,000 and a molecular weight distribution (Mw/Mn) of less than 2.0. The present invention provides a method for efficiently and inexpensively producing a conjugated diene polymer that includes a halogen atom at the terminal of the polymer chain, and has the desired molecular weight and a narrow molecular weight distribution.

Method for producing conjugated diene polymer

Conjugated diene polymer comprising at least a conjugated diene monomer unit, the conjugated diene polymer has a number-average molecular weight (Mn) in terms of polystyrene of 1,000 to 1,000,000, a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of lower than 2.0 and the polymer bears a halogen atom at a terminal of the polymer chain. Method for producing the conjugated diene polymer comprises subjecting a monomer containing at least a conjugated diene to living radical polymerization using a polymerization initiator comprising a halogenocyclopentadienyl triorganophosphine &#x3b7;-olefin ruthenium complex represented by formula (6) (and an organic halide. 

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Tokyo, Japan

Fumiaki Bando