Building Materials Investment Corporation

Peter Lars Johnson

Yonghong Ruan

William K Longcor, Iv

The present invention relates to a method for preparing an industrial asphalt comprising (1) heating an asphalt flux to a temperature which is within the range of about 400&#xb0; F. (204&#xb0; C.) to 550&#xb0; F. (288&#xb0; C.) to produce a hot asphalt flux, (2) sparging an oxygen containing gas through the hot asphalt flux for a period of time which is sufficient to increase the softening point of the asphalt flux to a value of at least 100&#xb0; F. (38&#xb0; C.), to produce an underblown asphalt composition; and (3) mixing a sufficient amount of a polyphosphoric acid throughout the underblown asphalt composition while the underblown asphalt composition is maintained at a temperature which is within the range of 200&#xb0; F. (93&#xb0; C.) to 550&#xb0; F. (288&#xb0; C.) to attain a softening point which is within the range of 185&#xb0; F. (85&#xb0; C.) to 250&#xb0; F. (121&#xb0; C.) and a penetration value of at least 15 dmm at 77&#xb0; F. (25&#xb0; C.) to produce the industrial asphalt.

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Wayne, NJ, United States of America

Peter Lars Johnson