Goodyear has patented a method for replenishing sealant in self-sealing tires during repairs. The process involves injecting a liquid polyisobutylene sealant into the tire’s sealant layer through puncture holes, followed by sealing the holes in the tire’s carcass and innerliner to restore self-sealing capabilities. GlobalData’s report on Goodyear Tire & Rubber gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Goodyear Tire & Rubber, Anti-skid tyre treads was a key innovation area identified from patents. Goodyear Tire & Rubber's grant share as of June 2024 was 76%. Grant share is based on the ratio of number of grants to total number of patents.
Replenishing sealant in self-sealing tires during repairs
The patent US12043008B2 outlines a method for replenishing sealant in self-sealing pneumatic tubeless tires that have lost sealant through holes. The method involves injecting a liquid sealant formulation, primarily composed of polyisobutylene, into the tire's sealant layer through the holes. This formulation is specifically designed to be free of fillers, peroxides, oils, and various types of rubbers, ensuring a pure composition. The injection is performed in a quantity sufficient to replace the lost sealant and restore the sealant layer to its original thickness, which can range from 0.2 mm to 8.5 mm, with a preferred range of 3 mm to 6 mm. Following the injection, the method includes repairing the holes in both the supporting carcass and the innerliner of the tire.
Additionally, the claims specify that the polyisobutylene used in the sealant formulation can have a weight average molecular weight between 40,000 to 130,000, with a more specific range of 50,000 to 110,000. The formulation may also include various pigments or colorants, allowing for customization in appearance. The patent emphasizes the absence of certain materials, such as polyethylene glycol and natural or synthetic rubbers, to maintain the integrity and performance of the sealant. Overall, this method provides a systematic approach to maintaining the functionality of self-sealing tires by effectively replenishing the sealant and ensuring the structural integrity of the tire is restored.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
