Processes for producing a sealant layer-tire inner liner combination as well as a sealant layer-containing tire and related processes involving the sealant layer-containing tire are disclosed. The sealant layer is adhered to the tire inner liner, has a thickness of 2-8 mm and comprises 100 parts of at least one rubber, 90-500 phr of at least one tackifier, optionally one or more extenders, optionally at least one hydroscopic substance, and a cure package.

Provided is a tire for a motorcycle having an improved turning stability on wet road surface, the tire comprises a tread composed of a rubber composition, which comes into contact with a road surface, wherein Hs being a rubber hardness and M300 being a tensile stress (MPa) at 300% elongation of the rubber composition of the tread satisfy Equations 1, 2, and 3:
60≤Hs≤80,  Equation 1:
2≤M300≤12, and  Equation 2:
(M300−2)/(Hs−60)≤0.75.  Equation 3:

A modified starch product includes a quantity of particles, each having a starch core with an intermediate polymer coating and an exterior coating of a nano-silica. A method for manufacturing a modified starch product including admixing to a silicate and water to form a nano-silica solution; admixing an original starch and a polymer to form particles with a starch core having an intermediate polymer layer; admixing the nano-silica solution and the starch particles having an intermediate polymer layer to form a suspension of the modified starch product; dewatering the suspension of the modified starch product; and drying the modified starch product to form the modified starch having particles including the starch core with the intermediate polymer coating and the exterior coating of a nano-silica. A rubber formulation includes a quantity of elastomer and a quantity of the modified starch. The particles are substantially evenly distributed throughout the elastomer.

The invention relates to a process for devulcanizing a vulcanized rubber mixture, comprising the following steps: A) providing or producing a vulcanized rubber mixture, B) comminuting the vulcanized rubber mixture into a granulate of vulcanized rubber particles, C) extruding the vulcanized rubber particles produced in step B) in a twin-screw extruder to form a devulcanized rubber mixture, wherein, during the extruding in step C) at least one regeneration reagent is added to the extruded rubber particles, wherein the regeneration reagent comprises at least one silane, at least one plasticizer, at least one aging stabilizer or mixtures thereof. The invention also comprises an apparatus for performing the method and the uses of the apparatus, and a rubber mixture and also a pneumatic vehicle tyre or a technical rubber article comprising a component composed of the rubber mixture.

The invention relates to a process for devulcanizing a vulcanized rubber mixture, comprising the following steps: A) providing or producing a vulcanized rubber mixture, B) comminuting the vulcanized rubber mixture into a granulate of vulcanized rubber particles, C) extruding the vulcanized rubber particles produced in step B) in a twin-screw extruder to form a devulcanized rubber mixture, wherein, during the extruding in step C) at least one regeneration reagent is added to the extruded rubber particles, wherein the regeneration reagent comprises at least one silane, at least one plasticizer, at least one aging stabilizer or mixtures thereof. The invention also comprises an apparatus for performing the method and the uses of the apparatus, and a rubber mixture and also a pneumatic vehicle tyre or a technical rubber article comprising a component composed of the rubber mixture.

A rubber modifier for a tire includes rosins and/or terpenes and at least one kind of nitrogen-containing compound selected from the group consisting of a nitrogen-containing heterocyclic compound, a tertiary amine compound, and an amino alcohol.

A rubber modifier for a tire includes rosins and/or terpenes and at least one kind of nitrogen-containing compound selected from the group consisting of a nitrogen-containing heterocyclic compound, a tertiary amine compound, and an amino alcohol.

Provided are copolymers which provide improved overall performance in terms of fuel economy and wet grip performance, as well as rubber compositions and tires containing the copolymers. Included is a copolymer obtained by copolymerizing an aromatic vinyl compound, a conjugated diene compound, and a compound represented by the formula (1) below or by copolymerizing a conjugated diene compound and a compound represented by the formula (1) below, the copolymer having a weight average molecular weight of 1.0×10.sup.3 to 2.5×10.sup.6, ##STR00001##
wherein R.sup.1 and R.sup.2 may be the same or different and each represents a functional group containing at least two selected from the group consisting of carbon, hydrogen, and silicon, and R.sup.1 and R.sup.2 may be joined together to form a ring structure.

Provided are copolymers which provide improved overall performance in terms of fuel economy and wet grip performance, as well as rubber compositions and tires containing the copolymers. Included is a copolymer obtained by copolymerizing an aromatic vinyl compound, a conjugated diene compound, and a compound represented by the formula (1) below or by copolymerizing a conjugated diene compound and a compound represented by the formula (1) below, the copolymer having a weight average molecular weight of 1.0×10.sup.3 to 2.5×10.sup.6, ##STR00001##
wherein R.sup.1 and R.sup.2 may be the same or different and each represents a functional group containing at least two selected from the group consisting of carbon, hydrogen, and silicon, and R.sup.1 and R.sup.2 may be joined together to form a ring structure.

The present invention provides a rubber composition obtained by kneading a rubber component, a vulcanization accelerator, silica, and a compound represented by the following formula (I): ##STR00001##
wherein the groups are as defined in the DESCRIPTION.