Rubber composition, reinforcing rubber, and run-flat tire

WO2026133986A1PCT designated stage Publication Date: 2026-06-25BRIDGESTONE CORP
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
BRIDGESTONE CORP
Filing Date
2025-12-04
Publication Date
2026-06-25

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Abstract

The present invention addresses the problem of providing a rubber composition having improved heat resistance while suppressing blooming and ensuring tackiness. The means for solving the problem is a rubber composition containing a rubber component, two or more sulfenamide-based vulcanization accelerators, and one or more thiuram-based vulcanization accelerators, wherein the content of each of the two or more sulfenamide-based vulcanization accelerators is 3.7 parts by mass or less per 100 parts by mass of the rubber component, and the total content of the two or more sulfenamide-based vulcanization accelerators is 4 parts by mass or more per 100 parts by mass of the rubber component.
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Claims

1. A rubber composition comprising a rubber component, two or more sulfenamide-based vulcanization accelerators, and one or more thiram-based vulcanization accelerators, wherein the content of each of the two or more sulfenamide-based vulcanization accelerators is 3.7 parts by mass or less per 100 parts by mass of the rubber component, and the total content of the two or more sulfenamide-based vulcanization accelerators is 4 parts by mass or more per 100 parts by mass of the rubber component.

2. The rubber composition according to claim 1, wherein the content of each of the one or more thiram-based vulcanization accelerators is 0.8 parts by mass or less per 100 parts by mass of the rubber component.

3. The rubber composition according to claim 1, wherein the rubber composition comprises a vulcanizing agent, and the mass ratio (A / B) of the total content (A) of the two or more sulfenamide-based vulcanization accelerators per 100 parts by mass of the rubber component to the content (B) of the vulcanizing agent per 100 parts by mass of the rubber component is 1 or more.

4. The rubber composition according to claim 1, wherein the mass ratio (A / C) of the total content (A) of the two or more sulfenamide-based vulcanization accelerators per 100 parts by mass of the rubber component to the total content (C) of the one or more thiram-based vulcanization accelerators per 100 parts by mass of the rubber component is 6 or more and 9 or less.

5. The rubber composition according to claim 1, wherein the rubber component is butadiene-based rubber and isoprene-based rubber.

6. The rubber composition according to claim 5, wherein the butadiene-based rubber is a modified butadiene rubber.

7. The rubber composition according to claim 5, wherein the content of the butadiene-based rubber is 20 parts by mass or more and 80 parts by mass or less per 100 parts by mass of the rubber component.

8. The rubber composition according to claim 1, further comprising a filler, wherein the content of the filler is 40 parts by mass or more and 70 parts by mass or less per 100 parts by mass of the rubber component.

9. The filler has an OAN (oil absorption capacity) of 120 mL / 100 g or more, and a nitrogen adsorption specific surface area of ​​20 m². ２ / g or more 80m ２ The rubber composition according to claim 8, wherein the carbon black is less than or equal to / g.

10. Reinforced rubber using the rubber composition described in claim 1.

11. A run-flat tire comprising the reinforcing rubber described in claim 10.