production of the crosslinked rubber particles rubber gels to be used from the base rubbers of the previously mentioned type is known in principle and described for example in u s pat no 5 395 891 and ep a 981 000 49 0 it is also possible to increase the particle sizes of the rubber particles by means of agglomeration the production of silica rubber hybrid gels by coagglomeration is also described for example in german patent application de a 199 39 865 8 naturally the crosslinked rubber particles like the above mentioned uncrosslinked double bond containing rubbers can likewise be modified by suitable functional groups which u2014 as mentioned previously u2014 are capable of reacting with phenolic resin adducts or with precondensed phenolic resin adducts and or improve the coupling of the rubber particles to the surrounding rubber matrix in the vulcanized state modified crosslinked rubber particles that are surface modified with hydroxyl carboxyl amino amido and epoxy groups and are present in the previously mentioned quantity range are preferably used in the rubber compounds according to the present invention modification of the crosslinked rubber particles rubber gels and introduction of the previously mentioned functional groups is likewise known to the person skilled in the art and described for example in german patent application no 199 19 459 9 199 29 347 3 198 34 804 5 reference is made at this point only to the modification of the corresponding rubbers or rubber gels in aqueous dispersion with corresponding polar monomers which are capable of introducing a hydroxyl amino amido carboxyl and or epoxy group into the rubbers component c of the rubber compounds according to the present invention contains phenolic.