INDUSTRIAL ASPHALTS

摘要

Disclosed is a method of producing an industrial asphalt from a bituminous material. One preferred embodiment comprises mixing together without air-blowing: a. a feed material comprising a bituminous material having a viscosity of at least 50 centistokes at 350.degree.F and wherein said feed material forms a single phase when mixed with 5 percent of 85 percent phosphoric acid; and b. from about 0.1 to 20.0 percent by weight of phosphoric acid, said mixing being done at a temperature in the range of 351 to 600.degree.F, whereby the softening point of the feed is substantially increased and the penetration is significantly decreased. A second preferred embodiment comprises heating at an elevated temperature a mixture comprising: l. from about 0.1 to 20.0 percent by weight green phosphoric acid, and 2. a bituminous material to make up 100 percent by weight, said bituminous material comprising asphalt.