Cross-linking compositions for polymer-modified asphalt compositions
AssigneeKraton Polymers U.S. LLC
InventorKeith Stephens
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Abstract
The present invention relates to a bituminous composition comprising a bituminous component, an elastomeric polymer component, and a specific cross-linking composition component comprising elemental sulfur, a sulfur-containing derivative, a sulfur activator, a fatty acid or fatty acid derivative and a polymeric carrier. Compositions according to the invention are particularly useful in preparing polymer-modified asphalt (“PMA”) for road applications.
Claims20
A cross-linking composition for use in preparing bitumen/elastomeric polymer mixtures, said cross-linking composition comprising:
- a. 5 to 50 percent by weight of elemental sulfur:
- b. 0.5 to 10 percent by weight of a sulfur-containing derivative selected from the group consisting of compounds having the formula
- where R1 and R2 are like or different alky radicals having 1 to 4 carbon atoms and wherein M is selected from the group consisting of zinc, barium, copper, cadmium and thallium;
- c. 5 to 50 percent by weight of a sulfur activator selected from zinc compounds;
- d. 5 to 50 percent by weight of a solubilizing agent selected from fatty acids and fatty acid derivatives;
- and
- e. 10 to 85 percent by weight of a polymeric carrier,
- said cross-linking composition having a zinc content of at least 2 weight percent, based on the total weight of the cross-linking composition and a zinc to sulfur content weight ratio of 0.5:1 to 2:1.
A cross-linking composition for use in preparing bitumen/elastomeric polymer mixtures, said cross-linking composition comprising:
- a. 5 to 50 percent by weight of elemental sulfur:
- b. 0.5 to 10 percent by weight of a sulfur-containing derivative selected from the group consisting of compounds having the formula
- where R1 and R2 are like or different alky radicals having 1 to 4 carbon atoms and wherein M is selected from the group consisting of zinc, barium, copper, cadmium and thallium;
- c. 5 to 50 percent by weight of a component selected from fatty acid derivatives of zinc;
- and
- d. 10 to 85 percent by weight of a polymeric carrier, said cross-linking composition having a zinc content of at least 2 weight percent, based on the total weight of the cross-linking composition and a zinc to sulfur content weight ratio of 0.5:1 to 2:1.
Dependencies are inferred from the claim text.