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US 5,637,350 AGranted
Encapsulation of asphalt prills
AssigneeA.P.I. Asphalt Prilling Inc.
InventorEugene A. Ross
Life of this patent
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Abstract
An encapsulated asphalt prill having an impervious, water-insoluble shell, and a process for making same are disclosed. The encapsulating material are preferably composed primarily of materials such as molten fatty acids, low melt polymers, waxes, elastomers (synthetic rubbers) or plastomers many of which are also used as blending agents to enhance the final use properties of the commercial asphalt end products.
Claims11
A process for making encapsulated asphalt prills comprising the steps of:
- i) spraying molten asphalt so that it breaks up into droplets;
- ii) spraying said droplets with a hot liquid coating which is solid at ambient temperatures and water-insoluble and water impervious at ambient temperatures and which has a melting point greater than 150 degrees Fahrenheit and wherein said coating comprises a material suitable for use as an asphalt additive,
- iii) cooling said coating to thereby completely encapsulate said droplets with a solid water-impervious, water-insoluble shell of material suitable for use as an asphalt additive.
A process for making encapsulated asphalt prills comprising the steps of:
- i) spraying molten asphalt so that it breaks up into droplets;
- ii) spraying said droplets with a liquid coating which is liquid at ambient temperatures and water-insoluble and water-impervious when solidified and wherein said coating comprises a material suitable for use as an asphalt additive,
- iii) drying said coating to thereby completely encapsulate said droplets with a solid water-impervious, water-insoluble shell of material suitable for use as an asphalt additive.
Dependencies are inferred from the claim text.