Method of foaming asphalt and products produced thereby

Details Method of foaming asphalt and products produced thereby Method of foaming asphalt and products produced thereby

1992-12-16

1995-04-11

Lesmes, George F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521151, 264 51, 4283044, 4283055, 428489, C08J 900

Patent

active

054058821

ABSTRACT:
A process of foaming asphalt comprises mixing sodium hydrogen carbonate with asphalt melted to a liquid state. The mixing yields carbon dioxide and water. The carbon dioxide gas foams the molten asphalt, and the foaming is enhanced by the boiling of the water. The rate of addition of the sodium hydrogen carbonate, and the temperature of the asphalt, are controlled in accordance with the desired specific gravity of the resultant foamed asphalt. The sodium hydrogen carbonate is added at a rate in a range of from about 2.0% by weight to about 6.0% by weight. The asphalt is melted at a temperature in a range from about 212.degree. F. to about 500.degree. F. The foamed asphalt is used, inter alia, by depositing the foamed asphalt on a substrate.

REFERENCES:
patent: 4456705 (1984-06-01), McCarthy
patent: 4524156 (1985-06-01), Cogliano
patent: 4590123 (1986-05-01), Hashimoto et al.
patent: 4692473 (1987-09-01), Wright et al.
patent: 4925494 (1990-05-01), Hageman
patent: 4966805 (1990-10-01), Ezawa et al.

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