Pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorHiroki Nakajima
Life of this patent
Estimating the term…
Abstract
A pneumatic tire having a tread, a sidewall, a bead portion having a bead core, a bead reinforcing layer reinforcing the bead portion, and a carcass ply moored on a bead core of the bead portion, wherein the bead reinforcing layer and adjacent members adjacent to the bead reinforcing layer are each composed of a rubber composition containing an amine type antioxidant, 0.3 to 8 parts by mass of the amine type antioxidant is contained in the bead reinforcing layer based on 100 parts by mass of the rubber component, and the adjacent member adjacent to the bead reinforcing layer and the bead reinforcing layer satisfy the following formula: 2≤B/A≤8 A: Content (wt %) of amine type antioxidant in bead reinforcing layer. B: Content (wt %) of amine type antioxidant in the adjacent member.
Claims16
A pneumatic tire comprising:
- a tread;
- a sidewall;
- a bead portion having a bead core;
- a bead reinforcing layer reinforcing the bead portion;
- a bead apex;
- and
- a carcass ply moored on a bead core of the bead portion, wherein
- the bead reinforcing layer is not in direct contact with the bead core and bead apex, the bead reinforcing layer and adjacent members adjacent to the bead reinforcing layer are each constituted of a rubber composition containing an amine type antioxidant,
- the rubber composition constituting the bead reinforcing layer comprises a rubber component containing natural rubber (NR) and/or isoprene rubber (IR),
- the rubber composition constituting the bead reinforcing layer has a tan δ at 70 ° C. of 0.09 or less and E* at 70° C. of 50 MPa or more,
- 0.3 to 8 parts by mass of the amine type antioxidant is contained in the bead reinforcing layer based on 100 parts by mass of the rubber component, and
- the adjacent members adjacent to the bead reinforcing layer and the bead reinforcing layer satisfy the following formula,
- 3≤B/A≤8
- A:
- Content (wt %) of amine type antioxidant in bead reinforcing layer
- B:
- Content (wt %) of amine type antioxidant in the adjacent members.
A pneumatic tire comprising:
- a tread;
- a sidewall;
- a bead portion having a bead core;
- a bead reinforcing layer reinforcing the bead portion;
- a bead apex;
- and
- a carcass ply moored on a bead core of the bead portion, wherein
- the bead reinforcing layer is not in direct contact with the bead core and bead apex,
- the bead reinforcing layer and adjacent members adjacent to the bead reinforcing layer are each composed of a rubber composition containing an amine type antioxidant,
- the rubber composition constituting the bead reinforcing layer comprises a rubber component containing 20 parts by mass or more of natural rubber (NR) and/or 15 parts by mass or more of isoprene rubber (IR) based on 100 parts by mass of the rubber component, the rubber composition constituting the adjacent members comprises natural rubber (NR) and/or butadiene rubber (BR),
- 0.3 to 8 parts by mass of the amine type antioxidant is contained in the bead reinforcing layer based on 100 parts by mass of the rubber component,
- the adjacent members adjacent to the bead reinforcing layer and the bead reinforcing layer satisfy the following formula,
- 3B/A≤8
- A:
- Content (wt %) of amine type antioxidant in bead reinforcing layer
- B:
- Content (wt %) of amine type antioxidant in the adjacent members.
A pneumatic tire comprising;
- a tread;
- a sidewall;
- a bead portion having a head core;
- a bead reinforcing layer reinforcing the bead portion;
- a bead apex:
- and
- a carcass ply moored on a bead core of the bead portion, wherein
- the bead reinforcing layer is not in direct contact ith the bead core and bead apex,
- the head reinforcing layer and at least one adjacent meniber adjacent to the bead reinforcing layer are each composed of a rubber composition containing a rubber component and an amine type antioxidant,
- 0.3 to 8 parts by mass of the amine type antioxidant is contained in the bead reinforcing layer based on 100 parts by mass of the rubber component,
- the at least one adjacent member adjacent to the bead reinforcing layer and the bead reinforcing layer satisfy the following formula,
- 3≤B/A≤8
- A:
- Content (wt %) of amine type antioxidant in the bead reinforcing layer
- B:
- Content (wt %) of amine type antioxidant in the at least one adjacent member.
Dependencies are inferred from the claim text.