Optionally, an additive such as an alkyl substituted aromatic sulfonic acid can be added to {HEAD ~ the composition} to further improve {TAIL ~ the asphalt properties} 
to improve
Optionally , an additive such as an alkyl substituted aromatic sulfonic acid can be added to { HEAD ~ the composition } to further improve { TAIL ~ the asphalt properties }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL