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OwnerChandrasekaran R. Pillai, Hari Chandrainventors
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This invention relates to a storage stabilized recycled and devulcanized tire rubber modified asphalt composition, which comprises: 65.0 to 90.0% by weight of a neat asphalt, 3.0-50.0% by weight of a recycled and devulcanized rubber from used tires and/or other scrap rubbers, 0.01-15.0% by weight of a compatibilizer/stabilizer derived from Natural or Synthetic Rubbers, which composition passes the “cigar tube” softening point test difference of less than 5° C. between the top and bottom layers; and, the process for the said asphalt composition comprises mixing 65.0% to 90.0% by weight of a neat asphalt, 3.0 to 50.0% by weight of a recycled and devulcanized rubber from used tires, 0.01-10.0% by weight of a compatibilizer/stabilizer derived from Natural or Synthetic Rubbers, using high shear mixers at elevated temperatures of between 120° C. and 175° C. for between 15 minutes to 6 hours, to obtain storage stabilized asphalt composition that is stable in hot storage and transportation conditions.
A composition obtained by the process of mixing devulcanized tire rubber 3.0% to 50.0% by weight of asphalt heated to 120° to 175° Celsius together with a polymer stabilizer with 0.01% to 15% by weight of one of the additives selected from a group of chemically modified polymers, namely Epoxidized Natural Rubber, Methyl Methacrylate grafted Natural Rubber and Styrene Butadiene Styrene block copolymer, whereby the polymer modified asphalt has a storage stability index of 5° C. or less on testing according to American Standards for Testing Materials Phase Separation Test Method ASTM # D 7173.
Dependencies are inferred from the claim text.