A tire comprising a sidewall with at least one high-contrast sidewall element
A tire sidewall composition with specific elastomer ratios and additives maintains high contrast and visual uniformity by resisting ozone degradation, addressing the issue of contrast reduction in worn tires.
FR3148431B1Active Publication Date: 2026-07-10MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
Patent Information
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
- Filing Date
- 2023-05-03
- Publication Date
- 2026-07-10
AI Technical Summary
Technical Problem
Existing tire sidewall high-contrast elements experience a reduction in contrast and visual alteration due to ozone degradation, leading to unacceptable differences in appearance between new and worn tires, particularly in sports or prestige vehicles.
Method used
A tire sidewall composition comprising a texture with protrusions or recesses, using a rubber compound with an elastomeric matrix, reinforcing fillers, crosslinking system, ozone-blocking wax, and rubber powder, with specific ratios of isoprene and butadiene elastomers, to enhance durability and contrast.
Benefits of technology
The solution maintains high contrast and visual integrity over time by resisting ozone-induced degradation, ensuring uniform appearance and improved durability of the sidewall elements.
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Abstract
The present invention relates to a tire (1) for a vehicle, comprising at least one sidewall (2), with at least one high-contrast sidewall element (3) consisting of a texture comprising raised protrusions (4, 5) relative to a sidewall surface (21) in contact with atmospheric air, and / or recesses (6) relative to the sidewall surface (21). The invention describes a sidewall rubber composition (2) exhibiting a good compromise between efflorescence reduction and resistance to ozone attack.According to the invention, the elastomeric matrix comprises an isoprene elastomer in a proportion of at least 35 parts per annum and at most 65 parts per annum, and a butadiene elastomer in a proportion of at least 35 parts per annum and at most 65 parts per annum, the reinforcing filler content is at least 5 parts per annum and at most 70 parts per annum, the ozone-fighting wax content is at least 1 part per annum and at most 3 parts per annum, and the rubber powder content is at least 2 parts per annum and at most 30 parts per annum. Figure for the abstract: Fig. 1.
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