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AssigneeBuilding Material Investment Corporation
InventorsKeith Edward Stephens, Nicholas R. Soto, Denis Muki Tibah
Estimating the term…
The present invention relates to a method for preparing an industrial asphalt comprising sparging an oxygen containing gas through an asphalt flux in the presence of 0.25 weight percent to about 12 weight percent of a highly saturated rubbery polymer at a temperature within the range of about 400° F. to about 550° F. for a period of time which is sufficient to increase the softening point of the asphalt flux to a value which is within the range of 185° F. to 250° F. and a penetration value of at least 15 dmm to produce the industrial asphalt. The highly saturated rubbery polymer can be a styrene-ethylene/butylene-styrene block copolymer rubber or a highly saturated styrene-ethylene/propylene-styrene block copolymer rubber.
A method for preparing an industrial asphalt comprising (1) heating an asphalt flux to a temperature of at least 120° F. to produce a hot asphalt flux, (2) adding from about 0.1 weight percent to about 10 weight percent of a highly saturated rubbery polymer to the hot asphalt flux, (3) mixing the highly saturated rubbery polymer throughout the hot asphalt flux to prepare a highly saturated rubbery polymer modified asphalt flux, (4) heating the highly saturated rubbery polymer modified asphalt flux to a temperature which is within the range of about 400° F. to about 550° F. to produce a hot highly saturated rubbery polymer modified asphalt flux, (5) sparging an oxygen containing gas through the hot highly saturated rubbery polymer modified asphalt flux for a period of time which is sufficient to increase the softening point of the highly saturated rubbery polymer modified asphalt flux to a value which is within the range of 185° F. to 250° F. and a penetration value which is within the range of 15 dmm to 25 dmm to produce the industrial asphalt.
An industrial asphalt composition which is comprised of (1) asphalt and (2) from about 0.1 weight percent to about 12 weight percent of a A-B-A block copolymer rubber having A blocks which are comprised of repeat units which are derived from at least one vinyl aromatic monomer and a B block which is comprised of isobutylene repeat units, wherein the industrial asphalt composition has a softening point which is within the range of 185° F. to 250° F. and a penetration value of at least 15 dmm.
Dependencies are inferred from the claim text.