Patent ID: 8053507

Claim:
A method for production of a highly filled elastomeric compound comprising: forming a highly filled elastomeric compound from an elastomeric resin wherein a filler comprises about 110% to about 500% by weight of the elastomeric resin; and adding dry microsilica to the highly filled elastomeric compound in an amount of 255% to 400% by weight of elastomeric resin as a modifier to improve processability, wherein the microsilica is particulate amorphous SiO 2 obtained from a process in which silica is reduced to SiO-gas and oxidized in vapor phase to form amorphous silica which contains at least 70% by weight silica (SiO 2 ) and has a specific density of 2.1-2.3 g/cm 3 and a surface area of 15-40 m 2 /g, and has primary particles being substantially spherical with an average size of about 0.15 μm; wherein the elastomeric resin comprises a polymer selected from the group consisting of natural rubber (NR), ethylene-propylene-diene rubber (EPM and EPDM), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), polychloroprene rubber (PCP), acrylate rubber, NBR blended with polyvinyl chloride, ethylene vinyl acetate copolymer and blends thereof.