A polymer based sealing compound which is foamed, which is applied to vehicle tyres for the reduction in weight and improvement of driving dynamics, a process for producing such foamed sealing compounds, and the use thereof in tyres.

Methods for producing a polymer-containing coating upon a cured tire inner liner using a coating composition of specified composition are provided. Also provided are methods for producing a tire comprising a cured inner liner (with a polymer-containing coating upon its radially inward-facing surface) and at least one component positioned radially inward of the cured inner liner. Tires containing a cured inner liner (with a polymer-containing coating upon its radially inward-facing surface) and at least one component positioned radially inward of the cured inner liner are also disclosed.

A system (1) for applying a sealing agent to the surface (5) of an internal cavity (2) of a pneumatic tyre (3) provided with an applicator device (12) for supplying a strip of sealing agent that is applied to the surface (5) and an opto-electronic device (4*; 20) that is integral to the nozzle (18) of the applicator device (12) and that is provided with at least one sensor element (9*; 20) that is able to acquire a plurality of images of the surface (5) and to provide a plurality of signals that are indicative of said plurality of acquired images; and an electronic processing system (11) connected to the opto-electronic device (4*; 20), and to the applicator device (12) and configured so as to acquire the signals that are indicative of the plurality of images acquired by the opto-electronic device (4*; 20); and to control the application of the sealing agent as a function of the plurality of signals that are indicative of the plurality of images acquired by the opto-electronic device (4*; 20).

An application system and method for applying a sealing agent to the inner surface of a pneumatic tire includes: rotating, by means of a support device, the pneumatic tire about an axis of rotation; applying a layer of sealing agent to the inner surface of the pneumatic tire by means of a dispensing head arranged within the pneumatic tire itself; pressing, by means of a pressure roller, the just applied layer of sealing agent against the inner surface of the pneumatic tire; pushing the pressure roller against the just applied layer of sealing agent by means of an actuator which generates a force having a desired value; determining, by means of a force sensor, a measured value of the force generated by the actuator; and cyclically varying the force generated by the actuator as a function of the measured value of the force.

Provided are a rubber composition for pneumatic tires with excellent fluidity and excellent degradation resistance, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for pneumatic tires containing a rubber component including a halogenated butyl rubber, and an organic peroxide.

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:

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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.

Provided are a rubber composition for pneumatic tires which is excellent in adhesion, sealing performance, fluidity, and processability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for pneumatic tires containing, per 100 parts by mass of a rubber component including a butyl-based rubber: 100 to 400 parts by mass of a liquid polymer; 1 to 40 parts by mass of an organic peroxide; and 1 to 40 parts by mass of a crosslinking activator.

The invention relates to a self-sealing pneumatic vehicle tire having a belt package (2), a tread (1) arranged radially above the belt package (2) and an airtight inner layer (4) arranged radially on the inside, wherein the self-sealing of the pneumatic vehicle tire is obtained via a sealant layer (5) subsequently applied radially on the inside after the vulcanization of the pneumatic vehicle tire, wherein the sealant layer (5) has essentially the width of the belt package (2) and is arranged essentially in the projection thereof and has a cross section which is formed in a cross-sectional plane including the tire axis and has a surface (5a) running essentially parallel to the belt package in axial direction and a surface (5b) running essentially in radial direction.

It is a feature of the invention that at least the surface of the sealant layer (5a) running essentially parallel to the belt package in axial direction has a circumferential coating (6) that contains at least elastomer particles.

In the method of the invention, the sealant layer is coated at least with elastomer particles.

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.

A tire with a built-in puncture sealant comprising a supporting tire carcass comprised of one or more layers of ply, an outer circumferential tread, and a radially inner layer, a pair of beads, sidewalls extending radially inward from the axial outer edges of the tread portion to join the respective beads, a sealant comprising an outer layer of sealant and an inner layer of sealant, disposed inwardly from said tire carcass inner layer, wherein the outer layer of sealant and the inner layer of sealant have different viscosities, and wherein said sealant provides self-sealing properties to the tire.