Mineral oils: processes and products – Oxidation of mineral oils – To form asphalts – tars or pitches
Reexamination Certificate
2011-03-08
2011-03-08
Singh, Prem C (Department: 1771)
Mineral oils: processes and products
Oxidation of mineral oils
To form asphalts, tars or pitches
C208S004000, C208S005000, C208S022000, C208S023000, C208S044000, C106S273100, C106S280000, C106S281100, C106S284100
Reexamination Certificate
active
07901563
ABSTRACT:
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° F. (204° C.) to 550° F. (288° 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° F. (38° 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° F. (93° C.) to 550° F. (288° C.) to attain a softening point which is within the range of 185° F. (85° C.) to 250° F. (121° C.) and a penetration value of at least 15 dmm at 77° F. (25° C.) to produce the industrial asphalt.
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Johnson Peter Lars
Longcor, IV William K.
Ruan Yonghong
Building Materials Investment Corporation
Davis William J.
Rockhill Alvin T.
Singh Prem C
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