Abstract: The present invention relates to a rubber composition containing a rubber component, a eutectic compound, metal oxide, and a peroxide-based crosslinking agent, and a production method thereof. The rubber composition in which the blending amount of metal oxide such as zinc oxide is largely reduced is obtained, which may have the same vulcanization characteristics and vulcanized-rubber physical properties as those of a rubber composition in which a large amount of metal oxide is blended, while considering the environment.

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: An object of the present invention is to provide a multicomponent copolymer for use for producing a rubber composition and a rubber product having high abrasion resistance and wet performance. Further, the invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition produced by crosslinking the rubber composition, and a tire and a rubber product using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the 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 5 mol % or more and less than 50 mol % of the whole multicomponent copolymer and the content of the non-conjugated olefin unit is more than 0 mol % and 50 mol % or less of the whole multicomponent copolymer.

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 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: The present invention relates to a rubber composition for run flat tires, containing a rubber component; a low-molecular weight conjugated diene-based polymer having a weight average molecular weight of 10,000 to 40,000 as expressed in terms of polystyrene in an amount of 1 to 10 parts by mass based on 100 parts by mass of the rubber component; and a vulcanization accelerator, with a ratio of the content of the vulcanization accelerator to the content of the low-molecular weight conjugated diene-based polymer (vulcanization accelerator/low-molecular weight conjugated diene-based polymer) being 1 to 3.5, from which a run flat tire with improved run flat durability without impairing the ride comfort is obtained. The run flat tire includes a sidewall section having a side reinforcing rubber layer formed from the rubber composition for run flat tires, a tread, a carcass, a bead core, and a bead filler.

Abstract: The present invention relates to a rubber composition for run flat tires, containing a rubber component; a low-molecular weight conjugated diene-based polymer having a weight average molecular weight of 10,000 to 40,000 as expressed in terms of polystyrene in an amount of 0.5 to 5 parts by mass based on 100 parts by mass of the rubber component; and sulfur, with a ratio of the content of sulfur to the content of the low-molecular weight conjugated diene-based polymer (sulfur/low-molecular weight conjugated diene-based polymer) being 1.8 or more, from which a run flat tire with improved run flat durability and ride comfort is obtained. The run flat tire includes a sidewall section having a side reinforcing rubber layer formed from the rubber composition for run flat tires, a tread, a carcass, a bead core, and a bead filler.

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: A multiblock copolymer, obtainable by copolymerization of a conjugated diene compound and a non-conjugated olefin, wherein: a structure of the multiblock copolymer includes A-(B-A)x and/or B-(A-B)x, wherein “A” represents a block portion constituted of monomer units of a non-conjugated olefin, “B” represents a block portion constituted of monomer units of a conjugated diene compound, and “x” represents an integer ?1; content of the non-conjugated olefin portion is ?30 mass %; and storage modulus G? at 130° C., measured by rubber process analysis using a rubber process analyzer, i.e. RPA, according to ASTM D6204, is ?20 kPa. It is possible to obtain vulcanized rubber and thus a tire having high fracture resistance and high weather resistance from the multiblock copolymer and a rubber composition derived therefrom.

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 for use for producing a rubber composition and a rubber product having high abrasion resistance and wet performance. Further, the invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition produced by crosslinking the rubber composition, and a tire and a rubber product using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the 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 5 mol % or more and less than 50 mol % of the whole multicomponent copolymer and the content of the non-conjugated olefin unit is more than 0 mol % and 50 mol % or less 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: 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: 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 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: 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: Provided is a method for producing a multicomponent copolymer comprising copolymerizing a conjugated diene compound, a non-conjugated olefin compound, and an aromatic vinyl compound to produce a multicomponent copolymer having a main chain consisting of an acyclic structure.