Jsr Corporation

Eneos Materials Corporation

Takumi Adachi

Ryoji Tanaka

Hirofumi Senga

Takuya Sano

Naoya Nosaka

Koichiro Tani

Takato Fukumoto

Toshimitsu Kikuchi

Michitaka Kaizu

Naoki Sugiyama

Hiroyuki Morita

Shigeru Abe

Toshiyuki Hayakawa

Takaomi Matsumoto

Fumihiro Toyokawa

Yuto Sakagami

Kunpei Kobayashi

Mitsunori Inoue

Jiro Ueda

Kenji Yanagibashi

A cross-linked product obtained through crosslinking a polymer composition that contains a rubber component, an inorganic filler and a cross-linking agent and that satisfies conditions (a) to (c): (a) the rubber component contains a conjugated diene-based polymer (A) having, when composition ratios (molar ratios) in the conjugated diene-based polymer (A) of structural units represented by formulae (1) to (4) are p, q, r, and s, respectively, a value α represented by formula (i) of 0.80 or more and 0.97 or less; (b) a blending ratio of the conjugated diene-based polymer (A) is 10% by mass or more relative to a total amount of the rubber component; and (c) a blending ratio of the inorganic filler is 40 to 150 parts by mass relative to 100 parts by mass of the rubber component, wherein the Tg of the cross-linked product is −25° C. or lower.

Cross-linked product and tire

A hydrogenated conjugated diene-based polymer which has a structure formed by bonding a nitrogen-containing compound having two or more alkoxysilyl groups and two or more nitrogen atoms with a plurality of conjugated diene-based polymer chains, wherein: when a composition ratio (molar ratio) in the hydrogenated conjugated diene-based polymer of each of a structural unit represented by formula (1), a structural unit represented by formula (2), a structural unit represented by formula (3), and a structural unit represented by formula (4) is p, q, r, and s, respectively, a value a represented by formula (i) is 0.80 or more and 0.97 or less, and an equilibrium storage modulus E' of the hydrogenated conjugated diene-based polymer is 2.4 MPa or more,α=(+(0.5×))/(+(0.5×)+)  (i)

Hydrogenated conjugated diene polymer, polymer composition, crosslinked body and tire

Rubber composition, crosslinked product, and tire

Provided is a rubber material that is well-balanced in terms of tensile strength, low hysteresis loss property, wet grip property, and abrasion resistance. A hydrogenated conjugated diene-based polymer which is a hydrogenation product of a conjugated diene-based polymer including butadiene-derived structural units is produced by a method comprising a step of preparing a conjugated diene-based polymer having, at a side chain moiety thereof, a functional group capable of interacting with silica; and a step of hydrogenating the conjugated diene-based polymer so as to achieve a hydrogenation rate of 80 to 99% of butadiene-derived structural units included in the conjugated diene-based polymer.

Method for producing hydrogenated conjugated diene-based polymer, hydrogenated conjugated diene-based polymer, polymer composition, cross-linked polymer, and tire

A modified conjugated diene-based polymer is produced by reacting a conjugated diene-based polymer having an alkali metal or an alkali-earth metal at a terminal of the polymer with a compound represented by formula (1). Rand Rindependently represent a hydrocarbyl group having 20 or fewer carbon atoms. Rrepresents a substituted alkyl group having 20 or fewer carbon atoms prepared through substitution of at least one of a hydrogen atom and &#x2014;CH&#x2014; of an alkyl group by a group containing only at least one heteroatom selected from the group consisting of nitrogen, phosphorus, oxygen, and sulfur, or a monovalent aromatic group having 20 or fewer carbon atoms and containing at least one element selected from the group consisting of nitrogen, phosphorus, oxygen, and sulfur, with the proviso that Rdoes not have active hydrogen. Rrepresents an alkanediyl group having 20 or fewer carbon atoms. n is 1 or 2. 

Modified conjugated diene polymer, method for producing modified conjugated diene polymer, polymer composition, crosslinked polymer, and tire

Provided is a tire member which is satisfactory in low fuel consumption performance and exhibits higher strength and more excellent abrasion resistance as compared with conventional ones. The tire member is a tire member obtained by subjecting a composition containing a hydrogenated conjugated diene polymer and a crosslinking agent to a crosslinking treatment, wherein the hydrogenated conjugated diene polymer is a hydrogenated product of a conjugated diene polymer that has a structural unit derived from butadiene and has a functional group at one end or both ends and the functional group is one or more groups selected from the group consisting of an amino group, an imino group, a pyridyl group, a phosphino group, a thiol group, and a hydrocarbyloxysilyl group.

Tire member, hydrogenated conjugated diene polymer, and polymer composition

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Minato-ku, Japan

Takumi Adachi