Delinked Polymer Modified Bitumen and Method of Producing Same
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United States of America Patent
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Issued Date -
May 28, 2009
app pub date -
Nov 24, 2008
filing date -
Nov 26, 2007
priority date (Note) -
Abandoned
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Abstract
A delinked polymer modified bitumen comprising a delinked polymer-bitumen composite and additional bituminous material. The delinked polymer-bitumen composite comprises sulfur-cured elastomeric material having a vulcanized network and a plurality of polymer backbones; at least one rubber accelerator and at least one activator in sufficient quantities to delink the vulcanized network of the sulfur-cured elastomeric material; and at least one bituminous material, where the sulfur-cured elastomeric material, the rubber accelerator, the activator, and the bituminous material are mixed under high shear conditions at a temperature greater than 70° C. to produce the delinked polymer-bitumen composite.
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