Emulsion of bitumen in a colloidal clay and water slurry

#This invention relates generally to the field of sealants, coatings and mastics, and, more particularly to the use of emulsions as sealants, coatings and mastics for cold applications.

#The use of bitumens and/or blends thereof for sealant, coating and mastic applications is well known. Bitumens are mixtures of heavy hydrocarbons, essentially naphthenic and paraffinic, originating from the distillation of crude oils. These products are distillation residues and are classified by their physical properties, their chemical properties varying very widely as a function of the origins of the crude. Generally speaking, conventional crudes contain up to 30% bitumen, and heavy crudes up to 50%. As bitumen requirements of the majority of countries represent 2 to 4% of their crude oil consumption, this means that bitumen is available in very plentiful supply. Bitumens contain such a diversity of constituents that it is impossible to define their exact composition; nevertheless, it is possible to classify these constituents into major chemical families:

#saturated compounds, essentially paraffinic;

#2 The preparation of an emulsified AC-20 type asphalt using bentonite slurry. Water 51 wt. % Bentonite 1.5-8.0 wt. % AC-250 Asphalt 46.3-47.3 wt. % (115° F. melting pt.) pH adjuster 0.2 wt. % 100%

#3 The preparation of an emulsified PPA hard asphalt using bentonite slurry. Water 51 wt. % Bentonite 1.5-8.0 wt. % Hard PPA Asphalt 45.3-46.3 wt. % (up to 185° F. melt pt.) pH adjuster 0.2 wt. % 100%

#4 The preparation of an emulsified coal tar using bentonite slurry. Water 52 wt. % Bentonite 7.0 wt. % Coal tar 41 wt. % 100%