Abstract: A puncture needle according to the present disclosure includes a puncture portion having a blade surface at a distal-end surface; and a retained portion connected to a proximal-end puncture-portion side and configured to be retained by a hub. The puncture portion includes a slit extending to the distal-end surface. The retained portion includes: a tubular portion having a substantially constant outer diameter larger than a maximum outer diameter of the puncture portion, and a tapered portion located between the puncture portion and the tubular portion, an outer diameter of the tapered portion gradually decreasing from a tubular-portion side to a puncture-portion side, wherein in a lateral view with the slit facing upward, lower contour lines of the puncture portion, the tubular portion, and the tapered portion are collinear.

Abstract: Inclusion of a thiol-functionalized EPDM in a rubber composition provides to the EPDM an enhanced affinity for carbon black fillers. Relatively small amounts of sue thiol-functionalized EPDM in a rubber composition that includes at least one polymer which includes ethylenic unsaturation permits better dispersion of such fillers, resulting in vulcanizates that have improved performance properties, specifically, simultaneous improvements in hysteresis and resistance to crack growth.

Abstract: A data management system includes: an input control unit (110) that adds measurement data uploaded by designating a theme that is a unit of access control and acquired by a measurement system, to a dataset classified based on metadata included in the measurement data, within the theme; a management control unit (120) that associates the dataset with a chapter that is a unit of status management and is provided within the theme; and a display control unit (130) that displays information managed by the data management system.

Abstract: Provided are a rubber composition for tires having excellent low fuel consumption and having crack resistance and tear resistance, which contains a rubber component (A) containing a synthetic isoprene having a weight-average molecular weight (Mw) of 800,000 or more, a molecular weight distribution (Mw/Mn) of 2.5 or less, and a cis-1,4-bond content of 96% or more, a carbon black (B), and a specific carbon black dispersant (C); and a tire using the rubber composition.

Abstract: The present invention provides a conjugated diene polymer containing a low vinyl portion having a vinyl content of 2 to 20% by mol and a high vinyl portion having a vinyl content of 50% by mol or more, and a method for producing the same; a rubber composition containing a rubber component containing the conjugated diene polymer, at least one filler selected from the group consisting of carbon black and silica, a silane coupling agent, and a crosslinking agent; crosslinked rubber prepared by crosslinking the rubber composition; and a rubber product and a tire containing the crosslinked rubber. The tire can achieve both the abrasion resistance and the low fuel consumption capability, the conjugated diene polymer, the rubber composition, and the crosslinked rubber are preferred for producing the tire, and the rubber product is excellent in abrasion resistance and low heat generation property.

Abstract: Provided is a multi-component copolymer capable of improving the rollability of a rubber composition while having excellent low heat generating property. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a ratio among all of the aromatic vinyl units of at least one aromatic vinyl unit existing in amorphous parts inclusive of the conjugated diene units is less than 50%.

Abstract: Provided is a multi-component copolymer comprising conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a peak top molecular weight of chain parts, divided by the conjugated diene units and each containing one or more of the non-conjugated olefin units and/or one or more of the aromatic vinyl units, is less than 2,000. A rubber composition comprising the multi-component copolymer, a crosslinked rubber composition, and a rubber article comprising the crosslinked rubber composition are also provided.

Abstract: Provided is a multi-component copolymer having crack growth resistance and wet performance. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a ratio among all of the aromatic vinyl units of at least one aromatic vinyl unit existing in amorphous parts inclusive of the conjugated diene units is 50% or more.

Abstract: An object of the present invention is to provide a multicomponent copolymer for use for producing a rubber composition and a rubber product such as tires and the like excellent in crack resistance and further having low heat generation while maintaining high weather resistance. Further, the present invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a rubber product and a tire using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the present invention contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein the main chain is formed of an acyclic structure alone and the content of the aromatic vinyl unit is 5 mol % or less of the whole multicomponent copolymer.

Abstract: Provided are a rubber composition for tires having excellent low fuel consumption and having crack resistance and tear resistance, which contains a rubber component (A) containing a synthetic isoprene having a weight-average molecular weight (Mw) of 800,000 or more, a molecular weight distribution (Mw/Mn) of 2.5 or less, and a cis-1,4-bond content of 96% or more, a carbon black (B), and a specific carbon black dispersant (C); and a tire using the rubber composition.

Abstract: Provided is a multi-component copolymer having high elasticity and excellent low heat generating property. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a peak top molecular weight of non-conjugated olefin parts linking only the non-conjugated olefin units is 40,000 or more.

Abstract: Provided is a multi-component copolymer having excellent crack growth resistance and wear resistance. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a peak top molecular weight of non-conjugated olefin parts linking only the non-conjugated olefin units is 500 or more and less than 40,000.

Abstract: An object of the present disclosure is to provide a multi-component copolymer being excellent in low-heat generation property and wear resistance. The multi-component copolymer contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein: a main chain thereof consists of noncyclic structures, a content of the aromatic vinyl unit is 2 mol % or less, and melting enthalpy of a non-conjugated olefin portion as a chain unit constituted exclusively of the non-conjugated olefin unit is 25 J/g or less.

Abstract: The present invention provides a conjugated diene polymer containing a low vinyl portion having a vinyl content of 2 to 20% by mol and a high vinyl portion having a vinyl content of 50% by mol or more, and a method for producing the same; a rubber composition containing a rubber component containing the conjugated diene polymer, at least one filler selected from the group consisting of carbon black and silica, a silane coupling agent, and a crosslinking agent; crosslinked rubber prepared by crosslinking the rubber composition; and a rubber product and a tire containing the crosslinked rubber. The tire can achieve both the abrasion resistance and the low fuel consumption capability, the conjugated diene polymer, the rubber composition, and the crosslinked rubber are preferred for producing the tire, and the rubber product is excellent in abrasion resistance and low heat generation property.

Abstract: A method for manufacturing a conjugated diene polymer that can increase the robustness of a polymerization reaction system is provided. Also, a conjugated diene polymer, with a high cis-1,4-bond content, that is manufactured by this method for manufacturing is provided. A method for manufacturing a conjugated diene polymer includes polymerizing a conjugated diene monomer using a polymerization catalyst composition including a rare earth element compound and a compound having a cyclopentadiene skeleton, and a conjugated diene polymer manufactured with this method for manufacturing has a cis-1,4-bond content of 95% or greater.

Abstract: Provided is a multi-component copolymer capable of improving the rollability of a rubber composition while having excellent low heat generating property. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a ratio among all of the aromatic vinyl units of at least one aromatic vinyl unit existing in amorphous parts inclusive of the conjugated diene units is less than 50%.

Abstract: Provided is a multi-component copolymer having high elasticity and excellent low heat generating property. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a peak top molecular weight of non-conjugated olefin parts linking only the non-conjugated olefin units is 40,000 or more.

Abstract: An object of the present invention is to provide a multicomponent copolymer excellent in impact resistance and having a high total light transmittance (transparency). Further, the present invention provides a resin composition containing the multicomponent copolymer, a crosslinked resin composition produced by crosslinking the resin composition, and a product using the resin composition or the crosslinked resin composition. The multicomponent copolymer of the present invention contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein the content of the aromatic vinyl unit is 50 mol % or more and less than 100 mol % of the whole multicomponent copolymer.

Abstract: An object of the present invention is to provide a multicomponent copolymer for use for producing a rubber composition and a rubber product such as tires and the like excellent in crack resistance and further having low heat generation while maintaining high weather resistance. Further, the present invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a rubber product and a tire using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the present invention contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein the main chain is formed of an acyclic structure alone and the content of the aromatic vinyl unit is 5 mol % or less of the whole multicomponent copolymer.

Abstract: Provided is a multi-component copolymer comprising conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a peak top molecular weight of chain parts, divided by the conjugated diene units and each containing one or more of the non-conjugated olefin units and/or one or more of the aromatic vinyl units, is less than 2,000. A rubber composition comprising the multi-component copolymer, a crosslinked rubber composition, and a rubber article comprising the crosslinked rubber composition are also provided.