TONER FINES AS AN ASPHALT CONCRETE ADDITIVE
Original Publication Date: 1993-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
Disclosed is an asphalt concrete composition containing toner fines as a performance enhancing additive. Toner fines comprising, for example, a carbon block pigment and polymeric resins, are obtained as a by product in the manufacture of toner materials in the printing industry. Known asphalt cement formulations may be supplemented with toner fines at concentration levels of from about 0.1 to about 40 weight percent using dry blending or liquid suspension media for uniformly dispersing the toner fines into the asphalt formulation. The asphalt concrete composition containing toner fines was found to exhibit improved wear and crack resistance in field tests. The toner fines additive is believed to impart improved color and color retention properties to the asphalt composition. The toner fines asphalt concrete composition also exhibits increased elasticity which enables asphalt surfaces to contract and expand without cracking and possibly possess a self-healing or crack closure mechanism when thermally cycled. Toner fines in asphalt provides a useful alternative application to landfill disposal of toner fines.