Sealant-containing tire and related processes

A tire containing a sealant layer comprising

• one or more belts, a road-contacting tread, an inner liner with a radially inward facing surface and a radially outward facing surface, and a sealant layer having an upper surface, a lower surface, and a thickness of 2-8 mm,
• wherein the sealant layer is adhered to either to the radially inward facing surface of the inner liner so that the lower surface of the sealant layer faces radially outward or to the radially outward facing surface of the inner liner so that the lower surface of the sealant layer faces radially outward,
• wherein the sealant layer comprises a mixture of
• i. 100 parts of rubber selected from the group consisting of butyl rubber, halogenated butyl rubber, and combinations thereof;
• ii. 300-450 phr of at least one tackifier comprising of a low molecular weight polymer or oligomer having a Mw of 700-150,000 grams/mole and a Mn of 500-100,000 grams/mole in combination with at least one resin selected from the group consisting of phenolic resins, aliphatic resins, cycloaliphatic resins, aromatic resins, terpene resins, guayule resins, and combinations thereof wherein the resin is present in an amount of 5 to 20% by weight of the tackifer;
• iii. one or more extenders in a total amount of 10 to 35 wherein the one or more extenders is selected from the group consisting of carbon black, silica, clay, titanium dioxide, calcium carbonate, graphite, talc, or a combination thereof, wherein carbon black is present in an amount of 20 to 30 phr;
• iv. a cure package including a vulcanizing agent limited to a sulfur-based compound and wherein the cure package excludes any peroxide or quinoline compounds, wherein the mixture of the sealant layer contains less than 10 phr of any block copolymer and has an elongation at break of 400-1200% at 25° C.