Pigmentable asphalt binder composition

Abstract

The present invention relates to the preparation of a pigmentable asphalt binder composition obtained from petroleum- and shale-refining streams, having a low content of asphaltenes, aromatic diluents of high aromaticity, polymers and inorganic pigments, obtaining a coloured product. The composition of the present invention is employed in paving, permitting embellishment of roads, greater light reflection and reduction in coating temperature and in addition greater resistance to permanent deformation due to its excellent temperature susceptibility and higher softening point.

1 . COLOURED ASPHALT BINDER COMPOSITION, wherein it comprises:
 a mixture of light-coloured aggregates; and a pigmentable asphalt binder, wherein said pigmentable binder comprises:   petroleum asphalt cement (CAP) ;   deasphaltation residue or vacuum residue, modified by polymers;   diluents derived from shale oil and petroleum;   inorganicpigments; and   optionally, containing fillers.   
   
   
       2 . COLOURED ASPHALT BINDER COMPOSITION, wherein said light-coloured aggregates are selected from among limestone, granite, basalt or gneiss, including sand. 
   
   
       3 . COLOURED ASPHALT BINDER COMPOSITION according to  claim 1 , wherein said polymers utilised for modifying said deasphaltation residue or vacuum residue are polymers of the styrene-butadiene-styrene type (SBS) and/or ethylene vinyl acetate (EVA) copolymer. 
   
   
       4 . COLOURED ASPHALT BINDER COMPOSITION according to  claim 1 , wherein said inorganic pigments are selected from among iron oxide, lead chromate, cobalt aluminate, chromium oxide and titanium oxide. 
   
   
       5 . COLOURED ASPHALT BINDER COMPOSITION according to  claim 1 , wherein said fillers are selected from among hydrated lime and/or Portland cement. 
   
   
       6 . COLOURED ASPHALT BINDER COMPOSITION as defined in  claim 1 , wherein incorporation of said polymers is effected following dilution of said asphalt cement or of said residues with diluents, wherein mixing is carried out in a band of temperature from 160° C. to 175° C. and during a period of from 2 to 4 hours. 
   
   
       7 . COLOURED ASPHALT BINDER COMPOSITION according to  claim 6 , wherein said fillers and pigments are added following incorporation of said polymers.