Abstract: A compound to produce an inner liner layer comprising a polymer base with a cross-linking unsaturated chain comprising at least 50 phr of a halobutyl rubber, a reinforcing filler, a vulcanization system and an oxygen-proofing chemical in granular form made up of a mineral filler bonded with fatty acids comprising a chain of carbon atoms ranging in number from 6 to 24 and having at least one unsaturation. The oxygen-proofing chemical is produced by causing the fatty acids and the mineral filler to react with a molar ratio that is equal to or greater than 5:2. The oxygen-proofing chemical in granular form has dimensions ranging from 5 nm to 50 ?M.

Abstract: A tyre comprising an impermeable layer designed to ensure the sealing under pressure of the air contained in the inner cavity of the carcass and a foam material provided on the inside of said inner cavity, wherein the foam material is made up of open cell foam with a cell size or diameter of from 150 to 190 ?m and a standard deviation of 5% to 15%.

Abstract: A tyre comprising an impermeable layer suitable to ensure the sealing under pressure of the air contained in the inner cavity of the carcass and a foam material with auxetic characteristics, which is housed inside the cavity and suitable to provide sound absorption.

Abstract: A tyre comprising a layer suitable to ensure the sealing under pressure of the air contained in the inner cavity of the carcass and a foam material for sound absorption based on a polycondensate of polyphenolic compounds of natural or synthetic origins housed inside said inner cavity. Preferably, the foam material is based on flavonoid tannins.

Abstract: A method of producing rubber compounds, in which the polymer base is composed partly of a first polymer material having a glass transition temperature of over ?50° C., and partly of a second polymer material having a glass transition temperature of below ?50° C. and silica as a filler. The method includes a preliminary first polymer material treating step, in which the first polymer material, a silica having a surface area of 80 to 135 m2/g, a silane bonding agent, and at least one nucleophile agent are mixed together; a preliminary second polymer material treating step, in which the second polymer material, a silica having a surface area of 150 to 220 m2/g, a silane bonding agent, and at least one nucleophile agent are mixed together; a mixing step, in which the compounds resulting from the preliminary treating steps are mixed together; and a final step, in which stearic acid and a curing system are added and mixed with the compound being produced.

Abstract: A method of producing rubber compounds, in which the polymer base is composed partly of a first polymer material having a glass transition temperature of over ?50° C., and partly of a second polymer material having a glass transition temperature of below ?50° C. and silica as a filler. The method includes a preliminary first polymer material treating step, in which the first polymer material, a silica having a surface area of 80 to 135 m2/g, a silane bonding agent, and at least one nucleophile agent are mixed together; a preliminary second polymer material treating step, in which the second polymer material, a silica having a surface area of 150 to 220 m2/g, a silane bonding agent, and at least one nucleophile agent are mixed together; a mixing step, in which the compounds resulting from the preliminary treating steps are mixed together; and a final step, in which stearic acid and a curing system are added and mixed with the compound being produced.