synthetic silicates such as aluminum silicate alkaline earth silicate such as magnesium silicate or calcium silicate with bet surface areas of 20 to 400 m 2 g and primary particle diameters of 5 400 nm these fillers may be used in quantities of 1 to 20 wt preferably 1 to 10 wt based on the total quantity of silica and carbon black used the rubber mixtures of the present invention are produced by mixing the individual components at temperatures in the range of 130 u00b0 c to 180 u00b0 c preferably at 145 u00b0 c to 180 u00b0 c without the addition of agents capable of initiating vulcanization of the mixture once the components have been mixed at the elevated temperature agents capable of initiating vulcanization may be added to the mixture these include in particular crosslinking agents such as sulfur and sulfur containing compounds as well as vulcanization accelerators of the aforementioned type the crosslinking agents are mixed in during the second mixing stage at a temperature u2266 100 u00b0 c preferably at temperatures in the range of 30 to 60 u00b0 c the rubber mixtures of the present invention can be produced using suitable apparatuses such as mixing rollers internal mixers or mixing extruders vulcanization of the rubber mixtures according to the present invention is usually carried out at temperatures of about 100 to 250 u00b0 c preferably 130 to 180 u00b0 c optionally under pressure at 10 to 200 bar the rubber mixtures produced according to the present invention are used for producing tires and tire components in particular.