Cationic bituminous emulsions and emulsion aggregate slurries
AssigneeWestvaco Corporation
InventorPeter Schilling
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Abstract
Reaction products of polyamines with epoxidized vegetable oils or epoxidized fatty esters are disclosed which give emulsions capable of producing cationic medium set mixing grade asphalt emulsions, as well as rapid set asphalt emulsions. Solventless asphalts as well as asphalts containing up to 12% by volume of a hydrocarbon oil can be used for emulsification. Emulsions prepared with these condensation products behave similarly to emulsions prepared with condensation products of polyamines and tall oil derived C.sub.21 -dicarboxylic acid, C.sub.22 -tricarboxylic acid or sulfonated tall oil fatty acids.
Claims19
A cationic bituminous emulsion comprising from about 30% to about 80% by weight of bitumen, from about 0.1% to about 10% by weight of an emulsifier selected from the group consisting of reaction products of a polyamine reacted with a member of the group consisting of epoxidized unsaturated fatty acids of chain lengths between C.sub.8 and C.sub.22 and the esters thereof and adding water to make up 100% by weight, the emulsion having a pH in the range of from 2-7.
A paving slurry seal mixture of a cationic aqueous bituminous emulsion and mineral aggregate capable of being worked comprising:
- a densely graded mineral aggregate passing through No. 4 and at least 80% retained on 200 mesh screen;
- from about 8% to about 20% of an oil in water type emulsion, based on the weight of the mineral aggregate, wherein the emulsion is comprised of from about 55% to about 65% bitumen, based on the weight of the emulsion, from about 0.5% to about 2% of a cation-active emulsifier selected from the group consisting of reaction products of a polyamine reacted with a member of the group consisting of epoxidized unsaturated fatty acids of chain lengths between C.sub.8 and C.sub.22 and the esters thereof, based on the weight of the emulsion, and adding water to make up 100% by weight of the emulsion, the emulsion having a pH in the range of from 2-7;
- from about 4% to about 16% water, based on the weight of the mineral aggregate, added to form a slurry of the aggregate and the emulsion;
- and up to 3% of an inorganic or organic additive to reduce the setting time of the mixture.
Dependencies are inferred from the claim text.