Emulsifiers for bituminous emulsions
AssigneeWestvaco Corporation
InventorPeter Schilling
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Abstract
Reaction products of polyamines with certain polycarboxylic acid anhydrides are disclosed which give emulsions capable of producing medium set mixing grade asphalt emulsions, rapid set asphalt emulsions, and quick set slurry seal emulsions. Solventless asphalts as well as asphalts containing up to 15% by volume of a hydrocarbon oil can be used for emulsification.
Claims20
A 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 polyamines reacted with a polycarboxylic acid anhydride of the following formulae:
- ##STR15## and 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 an 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 based on the weight of the emulsion, wherein the emulsifier is the reaction product of one or more polyamines reacted with a polycarboxylic acid anhydride of the following formulae:
- ##STR16## and water to make up 100% by weight of the emulsion;
- 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.