SEALANT COMPOSITION FOR SELF-SEALING PNEUMATIC TIRE

• Main Authors: PAPAKONSTANTOPOULOS, George Jim, GERSMAN, Michael Lawrence
• Format: Patent
• Language: English; French; German
• Published: 02.10.2024
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; DEVICES OR ARRANGEMENTS RELATED TO TYRES; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; PERFORMING OPERATIONS; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; VEHICLE TYRES; VEHICLES IN GENERAL; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A sealant composition for use in a tire (22) is disclosed. The sealant composition comprises 100 phr of elastomers, said elastomers comprising at least 60 phr or at least 75 phr of an isobutylene-based elastomer component and at least 5 phr or at least 8 phr of a conjugated diene-based elastomer component; at least 5 phr of a particulate filler; and at least 0.5 phr of an organic peroxide. Also, a method of forming a sealant layer and a method of manufacturing a pneumatic rubber tire having a puncture sealing feature is disclosed. The method comprises: building an unvulcanized tire (22) comprising a circumferential rubber tread (28), a supporting carcass (24), a containment layer (26), and a sealant layer (27) disposed intermediate the supporting carcass (24) and the containment layer (26), the sealant layer (24) comprising said sealant composition; and curing the unvulcanized tire (22) at a sufficient temperature to depolymerize the isobutylene-based elastomer component, at least partially, and to produce the pneumatic rubber tire having the puncture sealing feature.