A puncture sealing agent is disclosed which comprises natural rubber latex, an aqueous solution of an adhesive and an antifreezing agent. The adhesive is a carbohydrate and the puncture sealing agent comprises a solid content resulting from the natural rubber latex in an amount of 21 wt % or less, based on the total weight of the puncture sealing agent.

A self-healing polymeric composition includes a polymer matrix and a plurality of functional microcapsules dispersed in the polymer matrix. The functional microcapsules include a core of a flowable material that can form film via coalescence, physical crosslinking and/or polymerization on contact with the substrate, and a polymer shell encapsulating the core. The functionality on the polymer shell is effective in complexing with the corrosion by-products, releasing the core material to repair the failure.

The object of the present invention is to provide a tire puncture sealant having excellent sealing property, storage property, and injection property. The tire puncture sealant of the present invention contains a rubber latex and/or a resin emulsion and a cellulose fiber having a maximum fiber diameter of less than 1,000 nm, the cellulose fiber containing cellulose that optionally has a functional group.

A wheel rim accessory assemblable to a wheel of a vehicle, including: (a) a casing having an outlet adapted to be in fluid communication with the internal volume of the wheel, the casing being assemblable to the wheel rim of the wheel; (b) a filler substance disposed within the casing; and (c) a valve mechanism operationally coupled with the outlet, the valve mechanism controlling a flow of the filler substance from the casing to the internal volume of the wheel such that when a pressure level in the internal volume of the wheel is below a first predefined level, the valve mechanism allows the filler substance to flow into the internal volume until the pressure level reaches a second predefined level, wherein the second predefined level is equal to, or greater than, the first predefined level.

The present invention provides a pneumatic tire including a sealant layer that has excellent tear resistance despite its being formed of a generally string-shaped sealant provided continuously and spirally along an inner periphery of the tire. Included is a pneumatic tire including an innerliner and a sealant layer located radially inside the innerliner, the sealant layer including a first sealant layer and a second sealant layer stacked in that order from the innerliner, the first sealant layer including a generally string-shaped sealant provided continuously and spirally along an inner periphery of the tire, the second sealant layer including a generally string-shaped sealant provided continuously and spirally along the first sealant layer, the sealant of the first sealant layer and the sealant of the second sealant layer extending in directions crossing each other.

A tire sealant layer comprising a rubber portion with an upper surface and a lower surface, and a barrier layer upon the lower surface of the rubber portion is disclosed. The rubber portion comprises a mixture of 100 parts of at least one rubber, 90-500 parts of at least one tackifier, optionally one or more extenders, optionally at least one hydroscopic substance, and a cure package. Also disclosed is a process 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.

A polymer based sealing compound applied to vehicle tyres for the reduction of tyre noise, a process for producing such sealing compounds, and the use thereof in tyres for noise reduction.

A sealant composition of the present invention includes a rubber component (A), a tackifier (B), and a plasticizer (C), in which the tackifier (B) has a softening point of 50 C. or higher, the plasticizer (C) has a dynamic viscosity at 40 C. of 2500 mm.sup.2/s or less, and a mass ratio of (C)/(B) of the plasticizer (C) to the tackifier (B) is 0.35 or more. Thus, the sealant composition can provide improved sealability, viscosity temperature dependency, and fluidity during storage of a tire.

A sealing compound comprising an inventive extended sealing gel, a process for producing this sealing compound, the use of sealing gels in sealing compounds, and the use of sealing gel-containing sealing compounds in tyres

The present invention is directed to a method making a pneumatic tire, comprising the steps of: mixing a sealant composition comprising an elastomer, a filler, a diluent, a quinoid curing agent, an oxidant co-curative; and a cure modifier of formula 1:

##STR00001##

wherein R.sup.1 and R.sup.2 are independently H or C1 to C4 alkyl, or R.sup.1 and R.sup.2 taken together form a substituted or unsubstituted phenylene group; R.sup.3 and R.sup.4 are independently H, NH.sub.2, C1 to C4 alkyl, or OR.sup.5 where R.sup.5 is C1 to C4 alkyl, with the proviso that when R.sup.1 and R.sup.2 are taken together to form a substituted or unsubstituted phenylene group, R.sup.1 is C1 to C3 alkyl; applying the sealant composition to an inner surface of a cured tire; and curing the sealant composition.