Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
1996-02-07
1998-03-31
Buffalow, E. Rollins
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
428495, C08J 1104
Patent
active
057339430
ABSTRACT:
Reground rubber from used tires is mixed with a styrene-butadiene copolymer and polypropylene or polyethylene. The mixture is placed under temperatures and pressures to form a plasticized, moldable material, which is then injected into a mold to form sheet material suitable for street signs and other products. Alternatively, acetal resin is substituted for the polypropylene or polyethylene. Alteratively, a moldable product is formed from 75% reground rubber and 25% styrene-butadiene copolymer, which is then combined with ground polypropylene and virgin rubber, in which the combination is comprised of 25% virgin rubber, by weight. The combination is then partially plasticized under temperature and pressure, and then injected into a mold to form sheet material for street signs and other products.
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Technical Bulletin from Shell Chemical Company entitled "Shell Kraton.RTM. Rubber for Modification of Thermoplastics," No. SC:165-77 (Feb. 1977), 6 pp.
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