Use of zinc oxide to improve compatibility of polymer modified asphalt crosslinked with phenol aldehyde resin
AssigneeFina Technology, Inc.
InventorsPaul Buras, Joseph Bruns, William Lee
Life of this patent
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Abstract
In methods of preparing asphalt and elastomeric polymer compositions crosslinked with phenol aldehyde resins and sulfur, such as polymer modified asphalt (PMA), it has been discovered that the MP1 compatibility may be improved by adding certain ionic metal salts. Suitable ionic metal salts include, but are not necessarily limited to, zinc oxide, cadmium oxide, and the like. Acceptable elastomeric polymers include, but are not necessarily limited to, styrene-butadiene copolymers. Additional sulfur-containing crosslinkers may also be used.
Claims22
A method for preparing an asphalt and polymer composition comprising heating a mixture of asphalt and an elastomeric polymer;
- adding a phenol aldehyde resin crosslinker to the mixture;
- adding sulfur to the mixture;
- and adding an ionic metal salt to the mixture, where the metal of the ionic metal salt is selected from Groups IIB of the Periodic Table (CAS notation), where the crosslinker, sulfur, and the metal oxide are added in any order.
A method for preparing an asphalt and polymer composition comprising heating a mixture of asphalt and an elastomeric polymer;
- adding sulfur to the mixture;
- adding a phenol aldehyde resin crosslinker to the mixture in an amount ranging from about 0.05 to about 2.0 wt. % based on the mixture;
- and adding ionic metal salt in an amount ranging from about 0.1 to about 1.0 wt. % based on the mixture, where the sulfur, crosslinker and the ionic metal salt are added in any order;
- where the MP1 compatibility of the asphalt and polymer composition is improved as compared with the MP1 compatibility of an identical asphalt and polymer composition absent the metal oxide.
A polymer modified asphalt (PMA) comprising an asphalt having an elastomeric polymer crosslinked therewith by a phenol aldehyde resin, sulfur and a metal oxide, where the metal of the metal oxide is selected from Group IIB of the Periodic Table (CAS notation).
A polymer modified asphalt (PMA) comprising an asphalt having an elastomeric polymer crosslinked therewith by a phenol aldehyde resin in an amount ranging from about 0.05 to about 2.0 wt. % based on the amount of asphalt and polymer and zinc oxide in an amount ranging from about 0.1 to about 1.0 wt. % based on the amount of asphalt and polymer, where the MP1 compatibility of the asphalt and polymer composition is improved as compared with the MP1 compatibility of an identical asphalt and polymer composition absent the metal oxide.
A method of recycling asphalt comprising physically removing asphalt from a location and in any order reducing the size of the removed asphalt, heating the removed asphalt, adding an elastomeric polymer to the asphalt if not already present, adding a phenol aldehyde resin crosslinker to the asphalt, adding sulfur to the asphalt, and adding an ionic metal salt to the asphalt, where the metal of the ionic metal salt is selected from Groups IIB of the Periodic Table (CAS notation).
Aggregate comprising a PMA at least partially coating the aggregate, where the PMA comprises an asphalt having an elastomeric polymer crosslinked therewith by a phenol aldehyde resin, sulfur and a metal oxide, where the metal of the metal oxide is selected from Group IIB of the Periodic Table (CAS notation).
Dependencies are inferred from the claim text.