Patent ID: 7669791

Claim:
A method for the manufacture of a highly active rubber powder with a geometrical surface of 0.4 to 5 m 2 /g from scrap tires and vulcanized waste of rubber articles based on different rubber types in an extrusion type apparatus under thermomechanical action comprising reducing the size of scrap tires and vulcanized waste of rubber articles to rubber particles by subjecting the scrap tires and vulcanized waste of rubber articles to a pulsating volume strain of 15 to 250 MPa increasing at a rate of 5 to 90 MPa/s, with an amplitude +/−5 to 20 MPa and a frequency of 5 to 600 Hz, as well as with a temperature in the range of 90 to 380° C. increasing at a rate of 50 to 150° C./s accompanied by the simultaneous gas saturation of rubber with degradation products of plasticizing agents with a combining of such components initially taking place accompanied by the formation of a porous structure in the volume of the particles, and in the case of a marked volume strain reduction at a rate of 50 to 150 MPa/s, the porous structure is then destroyed, wherein geometrical surfaces of the rubber particles are increased and the particles are cooled.