Patent ID: 7510606
Filing Date: 2009-03-31
Classification: C08L

Abstract:
1. A bituminous emulsion containing water, wherein the median diameter of dispersed bitumen particles is less than 0.5 μm and said median diameter being the diameter of the dispersed bitumen particles that exactly divides the recorded population into two halves of equal volume, said emulsion containing at least one acid and at least one cationic surfactant chosen from alkyl polyamines, alkenyl polyamines, alkoxylated alkyl polyamines, alkoxylated alkenyl polyamines, alkyl quaternary ammonium salts, alkenyl quaternary ammonium salts, alkylamidoamines, alkenylamidomines, and their alkyl imidazoline cyclization, and alkenyl imidazoline cyclization derivatives, the alkyl or alkenyl being a chain containing between 8 and 22 carbon atoms, the acid and cationic surfactant being present in sufficient amounts to yield said median diameter of dispersed bitumen particles, with the acid and cationic surfactant being derived from an aqueous solution containing more than 30% by weight of surfactant and sufficient acid to keep the surfactant dissolved in said aqueous solution.