Cationic aqueous bituminous emulsion-aggregate slurries with improved curing rates
AssigneeWestvaco Corporation
InventorsPeter Schilling, Hans G. Schreuders
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Abstract
Slurries are formed with cationic emulsions prepared by emulsifying bitumen, such as an asphalt, in water with a cation-active emulsifier which is the product of the reaction of polyamine with certain polycarboxylic acids, which product is subsequently modified by reaction with from 10-30% of a member of the group consisting of acetic anhydride, phthalic anhydride, propylene carbonate, and styrene oxide.
Claims6
In a cationic aqueous bituminous emulsion-aggregate slurry formed with cationic emulsions prepared by emulsifying bitumen in water with a cation-active emulsifier which is an amine condensate product of the reaction at a temperature of from about 30.degree. C. to about 250.degree. C., of about 2 moles of a polyalkylene amine with about 1 mole of a member selected from the group consisting of polycarboxylic acids and anhydrides of the following general formulae ##STR8## wherein x and y are integers from 3 to 9, x and y together equal 10-14, at least one Z is a carboxylic acid group and any remaining Z is hydrogen, the improvement comprising cooling the amine condensate to about 150.degree. C. and further reacting the amine condensate at a temperature of about 220.degree. C. to about 250.degree. C. with a member of the group consisting of an acetic anhydride, an aromatic mono- and dicarboxylic acid, and its corresponding anhydride.
In a cationic aqueous bituminous emulsion-aggregate slurry formed iwth cationic emulsions prepared by emulsifying bitumen in water with a cation-active emulsifier which is an amine condensate product of the reaction at a temperature of from about 30.degree. C. to about 250.degree. C., of about 2 moles of a polyalkylene amine with about 1 mole of a member selected from the group consisting of polycarboxylic acids and anhydrides of the following general formulae ##STR9## wherein x and y are integers from 3 to 9, x and y together equal 10-14, at least one Z is a carboxylic acid group and any remaining Z is hydrogen, the improvement comprising cooling the amine condensate to about 150.degree. C. and further reacting the amine condensate at a temperature of about 220.degree. C. to about 250.degree. C. with organic carbonates.
Dependencies are inferred from the claim text.