Gilsonite emulsion and suspension composition
The gilsonite-asphalt emulsion composition of the present invention comprise a base stock consisting of a blend of gilsonite,asphalt,and a later or rubber . preferably the latex used is the residue after the water has been substantially removed, the base stock then being emulsified in water with an emulsifying agent .
In the gilsonite-asphalt base stock composition, gilsonite and asphalt are blended in a wide range of ratios of between about 1 part gilsonite-99 parts asphalt and 95 parts gilsonite-5 parts asphalt, by weight . preferably,gilsonite is present in amounts of at least about 5% although smaller amounts of gilsonite may be used.
the specific ratios of asphalt and gilsonite present in the base stock will depend on the use and the desired properties. For example,for paving compositions, normally more than 50% of the hydrocarbon composition will be asphalt , whereas for other uses such as in wallboard , insulation, roofing, or mineral and fiber-filed coating compositions and the like greater amounts of gilsonite may be used. However,such ratios and percentages are only guidelines, and the specific amounts of those materials may be selected as desired within the purview of the invention.
The rubber latex material comprises rubber emulsion or latexes in which small globules or particles of natural or synthetic rubber are suspended in water with emulsifying agents. The preferred rubber is styrene-butadiene(SBR),neoprene,or natural rubber . SBR latexes normally have a major amount of rubber present. For example , a commercially available SBR material contains about 68-70% rubber and about 30% water, the SBR rubber may also be cross-linked ,for example ,with carboxylate groups resulting from treatment with methacrylic acid , or the like.
Commercially available neoprene latexes have a solids content of about 35%, while a commercially available natural rubber latex has about 60% rubber. Other useful rubbers include nitrile,butyl,polyurethanes and silicones, and block copolymers such as styrene-isoprene (SIS) and styrene-ethylene-vinylacetate (SEVAS). In the present which may be cationic,nonionic or anionic . In the preferred SBR latexes, a fatty acid soap is used while in natural rubber natural proteins serve as anionic emulsifiers and stabilizers.
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