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A polymer composition obtainable by subjecting a particular crosslinkable polymer composition to dynamic crosslinking. The crosslinkable polymer composition contains. (a) a block copolymer comprising two or more polymer blocks of a vinyl aromatic compound and one or more (hydrogenated) polymer block

A polymer composition obtainable by subjecting a particular crosslinkable polymer composition to dynamic crosslinking. The crosslinkable polymer composition contains. (a) a block copolymer comprising two or more polymer blocks of a vinyl aromatic compound and one or more (hydrogenated) polymer blocks of a conjugated diene; (b) an olefin copolymer having a density of 0.88 to 0.92 g/cm2 and obtained through copolymerization of ethylene and an α-olefin having 4 to 12 carbon atoms; (c) a softening agent; and (d) an organic peroxide in respective amounts that satisfy the following relational expressions {circle around (1)} to {circle around (3)}: description="In-line Formulae" end="lead"0. 66≦Wb/Wa≦4{circle around (1)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead" 0≦Wc/(Wa+Wb+Wc)≦0.25{circle around (2)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0. 001≦Wd/(Wa+Wb+Wc)≦0.01{circle around (3)}description="In-line Formulae" end="tail" wherein Wa, Wb, Wc and Wd represent the respective amounts (by mass) of the components (a), (b), (c) and (d), that are present in the polymer composition prior to the dynamic crosslinking. The polymer composition of the present invention is based on a thermoplastic elastomer that has various improved properties, including moldability, abrasion resistance, scratch resistance, hydrolysis resistance, softness, rubber elasticity, grip, shock absorbance, oil resistance, lightweightness and mechanical strength, and has these properties in a well-balanced manner.

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What is claimed is: 1. A polymer composition prepared by subjecting a crosslinkable polymer composition to dynamic crosslinking, the crosslinkable polymer composition consisting essentially of: (a) a block copolymer comprising two or more polymer blocks A of a vinyl aromatic compound and one or mor

What is claimed is: 1. A polymer composition prepared by subjecting a crosslinkable polymer composition to dynamic crosslinking, the crosslinkable polymer composition consisting essentially of: (a) a block copolymer comprising two or more polymer blocks A of a vinyl aromatic compound and one or more polymer blocks B of a conjugated diene, the polymer block B being either hydrogenated or unhydrogenated; (b) an olefin copolymer having a density of 0.88 to 0.92 g/cm3 and obtained through copolymerization of ethylene and an α-olefin having 4 to 12 carbon atoms; (c) a softening agent; and (d) an organic peroxide, the respective amounts of components satisfying the following expressions {circle around (1)} to {circle around (3)}: description="In-line Formulae" end="lead"0.66 ≦Wb/Wa≦4 {circle around (1)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0 ≦Wc/(Wa+Wb+Wc)≦0.25 {circle around (2)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0.001 ≦Wd/(Wa+Wb+Wc)≦0.01 {circle around (3)}description="In-line Formulae" end="tail" wherein Wa, Wb, Wc and Wd represent the respective amounts by weight of the block copolymer (a), the olefin copolymer (b), the softening agent (c) and the organic peroxide (d) that are present in the polymer composition prior to dynamic crosslinking. 2. The polymer composition according to claim 1, wherein the composition has a domain-matrix structure in which particles of block copolymer (a) are dispersed in a matrix phase of olefin copolymer (b). 3. The polymer composition according to claim 1, wherein said vinyl aromatic compound of polymer block A is styrene, α-methylstyrene, o-methylstyrene, α-methylstyrene, p-methylstyrene, p-t-butylstyrene, 2,4-dimethylstyrene, 2,4,6-trimethylstyrene, vinylnaphthalene or vinylanthracene and optionally no more than 10% by weight of a monomer selected from the group consisting of 1-butene, pentene, hexene, butadiene, isoprene, methyl vinyl ether, methyl methacrylate and vinyl acetate. 4. The polymer composition according to claim 1, wherein, when polymer block B is formed from butadiene, 1,2-addition of the butadiene units ranges from 20 to 70 mol % and 1,4-addition of the butadiene units ranges from 30 to 10 mol % and when polymer block B is formed from isoprene alone or with butadiene, the mode of addition in polymerization is such that 1,2-addition plus 3,4-addition ranges from 5 to 70 mole %. 5. The polymer composition according to claim 1, wherein said α-olefin is 1-butene, 2-methyl-1-butene, 3-methyl-1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-decene and 1-dodecene. 6. A polymer composition prepared by subjecting a crosslinkable polymer composition to dynamic crosslinking, the crosslinkable polymer composition consisting essentially of: (a) a block copolymer comprising two or more polymer blocks A of a vinyl aromatic compound and one or more polymer blocks B of a conjugated diene, the polymer block B being either hydrogenated or unhydrogenated; (b) an olefin copolymer having a density of 0.88 to 0.92 g/cm3 and obtained through copolymerization of ethylene and an α-olefin having 4 to 12 carbon atoms; (c) a softening agent; (d) an organic peroxide; and (e) a rubber reinforcing agent, the respective amounts of components satisfying the following expressions {circle around (1)} to {circle around (4)}: description="In-line Formulae" end="lead"0.66 ≦Wb/Wa≦4 {circle around (1)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0 ≦Wc/(Wa+Wb+Wc)≦0.25 {circle around (2)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0.001 ≦Wd/(Wa+Wb+Wc)≦0.01 {circle around (3)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"We/ (Wa+Wb+Wc)≦0.3 {circle around (4)}description="In-line Formulae" end="tail" wherein Wa, Wb, Wc, Wd and We represent the respective amounts by weight of the block copolymer (a), the olefin copolymer (b), the softening agent (c), the organic peroxide (d) and the reinforcing agent (e) that are present in the polymer composition prior to dynamic crosslinking. 7. The polymer composition according to claim 6, wherein the rubber reinforcing agent (e) is a carbon black, a carbon fiber or a fibrous organic material. 8. A polymer composition prepared by subjecting a crosslinkable polymer composition to dynamic crosslinking, the crosslinkable polymer composition consisting essentially of: (a) a block copolymer comprising two or more polymer blocks A of a vinyl aromatic compound and one or more polymer blocks B of a conjugated diene, the polymer block B being either hydrogenated or unhydrogenated; (b) an olefin copolymer having a density of 0.88 to 0.92 g/cm3 and obtained through copolymerization of ethylene and an α-olefin having 4 to 12 carbon atoms; (c) a softening agent; and (d) an organic peroxide, (f) a blowing agent, the respective amounts of components satisfying the following expressions {circle around (1)} to {circle around (3)}: description="In-line Formulae" end="lead"0.66 ≦Wb/Wa≦4 {circle around (1)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0 ≦Wc/(Wa+Wb+Wc)≦0.25 {circle around (2)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0.001 ≦Wd/(Wa+Wb+Wc)≦0.01 {circle around (3)}description="In-line Formulae" end="tail" wherein Wa, Wb, Wc and Wd represent the respective amounts by weight of the block copolymer (a), the olefin copolymer (b), the softening agent (c) and the organic peroxide (d) that are present in the polymer composition prior to dynamic crosslinking. 9. The polymer composition according to claim 8, wherein the blowing agent (f) a carbonate salt, an organic acid, an azo compound, a nitroso compound or a sulfonyl hydrazide. 10. The polymer composition according to claim 8, wherein the blowing agent (f) is incorporated in the composition in an amount that satisfies the expression: description="In-line Formulae" end="lead"0.001 ≦Wf/(Wa+Wb+Wc)≦0.1.description="In-line Formulae" end="tail" 11. A polymer composition prepared by subjecting a crosslinkable polymer composition to dynamic crosslinking, the crosslinkable polymer composition consisting essentially of: (a) a block copolymer comprising two or more polymer blocks A of a vinyl aromatic compound and one or more polymer blocks B of a conjugated diene, the polymer block B being either hydrogenated or unhydrogenated; (b) an olefin copolymer having a density of 0.88 to 0.92 g/cm3 and obtained through copolymerization of ethylene and an α-olefin having 4 to 12 carbon atoms; (c) a softening agent; (d) an organic peroxide; (e) a rubber reinforcing agent; and (f) a blowing agent, the respective amounts of components satisfying the following expressions {circle around (1)} to {circle around (4)}: description="In-line Formulae" end="lead"0.66 ≦Wb/Wa≦4 {circle around (1)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0 ≦Wc/(Wa+Wb+Wc)≦0.25 {circle around (2)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0.001 ≦Wd/(Wa+Wb+Wc)≦0.01 {circle around (3)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"We /(Wa+Wb+Wc)≦0.3 {circle around (4)}description="In-line Formulae" end="tail" wherein Wa, Wb, Wc, Wd and We represent the respective amounts by weight of the block copolymer (a), the olefin copolymer (b), the softening agent (c), the organic peroxide (d) and the reinforcing agent (e) that are present in the polymer composition prior to dynamic crosslinking. 12. A polymer composition prepared by subjecting a crosslinkable polymer composition to dynamic crosslinking, the crosslinkable polymer composition consisting essentially of: (a) a block copolymer comprising two or more polymer blocks A of a vinyl aromatic compound and one or more polymer blocks B of a conjugated diene, the polymer block B being either hydrogenated or unhydrogenated; (b) an olefin copolymer having a density of 0.88 to 0.92 g/cm3 and obtained through copolymerization of ethylene and an α-olefin having 4 to 12 carbon atoms; (c) a softening agent; (d) an organic peroxide; and (g) a lubricant, the respective amounts of components satisfying the following expressions {circle around (1)} to {circle around (3)} and {circle around (5)}: description="In-line Formulae" end="lead"0.66 ≦Wb/Wa≦4 {circle around (1)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0 ≦Wc/(Wa+Wb+Wc)≦0.25 {circle around (2)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0.001 ≦Wd/(Wa+Wb+Wc)≦0.01 {circle around (3)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Wg /(Wa+Wb+Wc)≦0.3 {circle around (5)}description="In-line Formulae" end="tail" wherein Wa, Wb, Wc, Wd and Wg represent the respective amounts by weight of the block copolymer (a), the olefin copolymer (b), the softening agent (c) and the lubricant (g) that are present in the polymer composition prior to dynamic crosslinking. 13. A polymer composition prepared by subjecting a crosslinkable polymer composition to dynamic crosslinking, the crosslinkable polymer composition consisting essentially of: (a) a block copolymer comprising two or more polymer blocks A of a vinyl aromatic compound and one or more polymer blocks B of a conjugated diene, the polymer block B being either hydrogenated or unhydrogenated; (b) an olefin copolymer having a density of 0.88 to 0.92 g/cm3 and obtained through copolymerization of ethylene and an α-olefin having 4 to 12 carbon atoms; (c) a softening agent; (d) an organic peroxide; (e) a rubber reinforcing agent; and (g) a lubricant, the respective amounts of components satisfying the following expressions {circle around (1)} to {circle around (5)}: description="In-line Formulae" end="lead"0.66 ≦Wb/Wa≦4 {circle around (1)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0 ≦Wc/(Wa+Wb+Wc)≦0.25 {circle around (2)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"0.001 ≦Wd/(Wa+Wb+Wc)≦0.01 {circle around (3)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"We /(Wa+Wb+Wc)≦0.3 {circle around (4)}description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Wg /(Wa+Wb+Wc)≦0.3 {circle around (5)}description="In-line Formulae" end="tail" wherein Wa, Wb, Wc, Wd, We and Wg represent the respective amounts by weight of the block copolymer (a), the olefin copolymer (b), the softening agent (c), the organic peroxide (d) and the reinforcing agent (e) that are present in the polymer composition prior to dynamic crosslinking. 14. A footgear sole comprising: the polymer composition according to claim 1. 15. A footgear sole comprising: the polymer composition according to claim 6. 16. A footgear sole comprising: the polymer composition according to claim 8. 17. A footgear sole comprising: the polymer composition according to claim 11. 18. A footgear sole comprising: the polymer composition according to claim 12.