Quick-breaking bituminous emulsions

Claim 1

A QUICK-BREAKING OIL-IN-WATER TYPE EMULSION HAVING IMPROVED BONDED CHARACTERISTICS TOWARD HYDROPHILIC AGGREGATE, CONSISTING ESSENTIALLY OF WATER AND A BITUMINOUS MATERIAL EMULSIFIED THEREIN; AND AN ALKALI METAL CHROMIUM SALT SELECTED FROM THE GROUP CONSISTING OF CHROMATES AND DICHROMATES IN AN AMOUNT FROM 0.05 TO 0.5% BY WEIGHT SUFFICIENT TO PROMOTE SUBSTANTIALLY THE ADHESION TO HYDROPHILIC AGGREGATE OF THE ASPHALT COATING FORMED FROM THE EMULSION, SAID AMOUNT OF CHROMIUM SALT NORMALLY TENDING TO BREAK QUICK-BREAKING EMULSIONS; AN ALKALI METAL SALT OF A PHOSPHATED RICINOLEIC ACID ESTER FORMED FROM A GLYCOL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GYLCOL, PROPYLENE GLYCOL AND GLYCERINE IN AN AMOUNT FROM 0.02 TO 1.0% BY WEIGHT SUFFICIENT TO COUNTERACT THE TENDENCY OF SAID CHROMIUM SALT TO BREAK THE EMULSION WITHOUT ADVERSELY AFFECTING THE QUICK-BREAKING PROPERTIES OF THE EMULSION; AND WATER-SOLUBLE ALKALI IN SUFFICIENT AMOUNT TO GIVE THE AQUEOUS PHASE OF THE EMULSION AN ALKALINE PH BUT LESS THAN THAT WHICH, TOGETHER WITH THE CHROMIUM SALT AND PHOSPHOROUS SALT, REDUCES THE DEMULSIBILITY BELOW 55% AS MEASURED IN THE ASTM D244-42 (DEMULSIBILITY) TEST.