Abstract: A transponder to be fitted in or on a surface of an article which is substantially formed of a rubber product, in particular a transponder to be fitted in a tire, has a dipole antenna. The antenna length Lair, wherein air is exclusively present as the transmission medium, is calculated with the equation Lair=0.5×c/f, wherein c is the speed of light and f is the transmission frequency. In order to achieve a long transmission range, the transponder in the rubber product has an antenna length Lkp between 0.45×Lair and 0.90×Lair, preferably substantially between 0.61×Lair and 0.71×Lair.

Abstract: A sulfur-curable rubber compound for a tire tread rubber of, in particular, a racing tire, which compound comprises at least one diene rubber, at least one filler and at least one plasticizer. The rubber compound comprises 5 to 90 phr of at least one layered silicate modified with alkylammonium ions and free of guest molecules that have been polymerized or swelled in by a prior treatment.

Abstract: The invention relates to a transponder which is mounted in a tire. The transponder includes at least a transponder chip and a transponder antenna and is embedded in a substrate. The substrate is connected to an inner side of the tire by a connecting structure. In order to provide a transponder with the longest possible service life, the substrate is decoupled from the inner side of the tire via a connecting structure in the form of a soft or gliding support in such a manner that no or only minimum mechanical stresses are transmitted to the substrate. The connecting structure is arranged between the substrate and the inner side of the tire.

Abstract: A transponder to be fitted in or on a surface of an article which is substantially formed of a rubber product, in particular a transponder to be fitted in a tire, has a dipole antenna. The antenna length Lair, wherein air is exclusively present as the transmission medium, is calculated with the equation Lair=0.5×c/f, wherein c is the speed of light and f is the transmission frequency. In order to achieve a long transmission range, the transponder in the rubber product has an antenna length Lkp between 0.45×Lair and 0.90×Lair, preferably substantially between 0.61×Lair and 0.71×Lair.

Abstract: A sulfur-curable rubber compound for a tire tread rubber of, in particular, a racing tire, which compound comprises at least one diene rubber, at least one filler and at least one plasticizer. The rubber compound comprises 5 to 90 phr of at least one layered silicate modified with alkylammonium ions and free of guest molecules that have been polymerized or swelled in by a prior treatment.

Abstract: Unvulcanized rubber mixture includes at least one rubber, aggregate, and at least one filler, wherein a surface of the at least one filler has been modified with a stimuli-sensitive substance. A filler for unvulcanized rubber mixtures includes a surface which has been modified with a stimuli-sensitive substance. A process for making an unvulcanized rubber mixture including at least one rubber, aggregate, and at least one filler, wherein a surface of the at least one filler has been modified with a stimuli-sensitive substance. The process includes coating a surface of at least one filler with a stimuli-sensitive substance to form at least one coated filler, and mixing the at least one coated filler with unvulcanized rubber and aggregate. A rubber product formed from an unvulcanized rubber mixture includes at least one rubber, aggregate, and at least one filler, wherein a surface of the at least one filler has been modified with a stimuli-sensitive substance.