Patent ID: 8901212

Claim:
A process for the manufacture of a polymer/bitumen composite for enhancing desirable properties of asphalt comprising the steps of: a. providing a blend of rubber feedstock comprising at least 30% butyl rubber polyisoprene powder from used butyl bladders and powdered polyisoprene from any one of waste elastic bands, rubber bands and/or rubber thread manufacture; b. mixing the rubber feedstock of butyl rubber, polyisoprene powder, and powdered polyisoprene wastes with a peptizing agent in doses ranging from 0.01 to 0.15 parts per hundred of the weight of the rubber feedstock of butyl rubber, polyisoprene powder, and powdered polyisoprene wastes in an internal mixer (Banbury) at 70° C. to 230° C., cooling the mixture, then transferring into another enclosed chamber with rotors (Internal Mixer); c. and heating the mixture with a blend of bitumen, polyethylene and polypropylene at 5% to 50% of the weight of the butyl rubber polyisoprene powder mixture, in the enclosed chamber at temperature range of 160° C. to 320° C. for a period of 3 to 120 minutes to produce the rubber/bitumen/plastic mixture, then dropping onto a dump mill at the bottom of the Internal Mixer; d. and further mixing 5 to 25 parts per hundred parts of the said rubber/bitumen/plastic mixture a virgin polymer for the purpose of creating material that can be sheeted out on rubber dump mills; the virgin polymer selected from the group consisting of Styrene Butadiene Rubber (SBR), Natural Rubber (NR), synthetic Polyisoprene (IR) and Styrene Butadiene Copolymer (SBS).