Pneumatic tire and crosslinked rubber composition
First Claim
1. A pneumatic tire comprising:
- bead cores provided on a pair of right and left bead portions, respectively,a carcass ply extending from a crown portion to the both bead portions through both side wall portions and moored to the bead cores,an inner liner disposed at an inner side than the carcass ply in a direction of a tire diameter, anda tread disposed at an outer side than the carcass ply in a direction of a tire diameter, comprising a crosslinked rubber composition and having a volume of a low density region of 35% or more at elongation by an applied stress of 1.5 MPa, a volume of a void portion of 7.5% or less at elongation by an applied stress of 3.0 MPa and a filler dispersibility index Δ
G* shown by the following equation (I) of 3 or less;
Δ
G*=(G*(4%)−
G*(256%))/G*(256%)
(I)wherein in the equation (I), G* (n %) indicates a shear modulus when an n % strain is applied,wherein the low density region is a region where a deviation in density in the crosslinked rubber composition is generated by an applied stress and the deviation disappears by a release of the stress, and an original uniform density distribution is recovered, and said region has a density of 0.1 to 0.8 times the density of the crosslinked rubber composition before elongation, andwherein the void portion is a region where an inner structure of the crosslinked rubber composition is broken and the region has a density of 0 to 0.1 times the density of the crosslinked rubber composition before elongation.
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Abstract
The pneumatic tire of the present invention characterized by comprising: bead cores, a carcass ply, an inner liner disposed at an inner side than the carcass ply in a direction of a tire diameter, and a tread disposed at an outer side than the carcass ply in a direction of a tire diameter and having a volume of the low density region of 35% or more at elongation by an applied stress of 1.5 MPa, a volume of the void portion of 7.5% or less at elongation by an applied stress of 3.0 MPa and a filler dispersibility index ΔG* shown by the following equation (I) of 3 or less and the crosslinked rubber composition having a volume of the low density region of 35% or more at elongation by an applied stress of 1.5 MPa, a volume of the void portion of 7.5 or less at elongation by an applied stress of 3.0 MPa and a filler dispersibility index ΔG* shown by the following equation (I) of 3 or less are excellent in abrasion resistance.
ΔG*=(G*(4%)−G*(256%))/G*(256%) (I)
In the equation (I), G* (n %) indicates a shear modulus when an n % strain is applied.
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Citations
16 Claims
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1. A pneumatic tire comprising:
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bead cores provided on a pair of right and left bead portions, respectively, a carcass ply extending from a crown portion to the both bead portions through both side wall portions and moored to the bead cores, an inner liner disposed at an inner side than the carcass ply in a direction of a tire diameter, and a tread disposed at an outer side than the carcass ply in a direction of a tire diameter, comprising a crosslinked rubber composition and having a volume of a low density region of 35% or more at elongation by an applied stress of 1.5 MPa, a volume of a void portion of 7.5% or less at elongation by an applied stress of 3.0 MPa and a filler dispersibility index Δ
G* shown by the following equation (I) of 3 or less;
Δ
G*=(G*(4%)−
G*(256%))/G*(256%)
(I)wherein in the equation (I), G* (n %) indicates a shear modulus when an n % strain is applied, wherein the low density region is a region where a deviation in density in the crosslinked rubber composition is generated by an applied stress and the deviation disappears by a release of the stress, and an original uniform density distribution is recovered, and said region has a density of 0.1 to 0.8 times the density of the crosslinked rubber composition before elongation, and wherein the void portion is a region where an inner structure of the crosslinked rubber composition is broken and the region has a density of 0 to 0.1 times the density of the crosslinked rubber composition before elongation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A crosslinked rubber composition having a volume of the low density region of 35% or more at elongation by an applied stress of 1.5 MPa, a volume of a void portion of 7.5 or less at elongation by an applied stress of 3.0 MPa and a filler dispersibility index Δ
- G* shown by the following equation (I) of 3 or less;
Δ
G*=(G*(4%)−
G*(256%))/G*(256%)
(I)wherein in the equation (I), G* (n %) indicates a shear modulus when an n % strain is applied, wherein the low density region is a region having a density in density in the crosslinked rubber composition is generated by an applied stress and the deviation disappears by a release of the stress, and an original uniform density distribution is recovered, and said region has a density of 0.1 to 0.8 times the density of the crosslinked rubber composition before elongation, and wherein the void portion is a region where an inner structure of the crosslinked rubber composition is broken and the region has a density of 0 to 0.1 times the density of the crosslinked rubber composition before elongation. - View Dependent Claims (14, 15)
- G* shown by the following equation (I) of 3 or less;
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16. A crosslinked rubber composition having a volume of a low density region of 35% or more at elongation by an applied stress of 1,5 MPa, a volume of a void portion of 7.5 or less at elongation by an applied stress of 3.0 MPa and a filler dispersibility index Δ
- G* shown by the following equation (I) of 3 or less;
Δ
G*=(G*(4%)−
G*(256%)/G*(256%)
(I)wherein in the equation (I), G* (n %) indicates a shear modulur when an n % strain is applied, wherein the low density region is a region where a deviation in density in the crosslinked rubber composition is generated by an applied stress and the deviation disappears by a release of the stress, and an original uniform density distribution is recovered, and said region has a density of 0.1 to 0.8 times the density of the crosslinked rubber composition before elongation, wherein the void portion is a region where an inner structure of the crosslinked rubber composition is broken and the region has a density of 0 to 0.1 times the density of the crosslinked rubber composition before elongation, wherein the volume of the low density region at elongation by an applied stress of 1.5 MPa is evaluated from a density distribution of the crosslinked rubber composition when extended using an X-ray computerized tomography, the volume of the void portion at elongation by an applied stress of 3.0 MPa is evaluated from a density distribution of the crosslinked rubber composition when extended using an X-ray computerized tomography, wherein a decay time of a phosphor for convering the X-ray into a visible light is 100 ms or less, and wherein a luminance of the X-ray is 1010 photons/s/mrad2/mm2/0.1% bw or more.
- G* shown by the following equation (I) of 3 or less;
Specification