Composition and method for improving the storage stability of polymer modified asphalts
AssigneeExxon Research & Engineering Co.
InventorsLyle E. Moran, Katherine L. Sokol
Life of this patent
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Abstract
This invention relates to a composition and method for improving the storage stability of an asphalt that contains a higher molecular weight polymer having a number average molecular weight of at least about 10,000 which comprises adding a storage stable improving amount of a polymerized alpha-olefin prepared from an alpha-olefin of the formula ##STR1## where R is C.sub.6 to C.sub.50 alkyl, R.sup.1 is hydrogen or C.sub.6 to C.sub.50 alkyl, wherein the polymerized alpha-olefin has a number average molecular weight of from about 500 to 5,000 and is characterized in that it has a congealing and melting point which is essentially no higher than the congealing and melting point of the alpha-olefin from which it is prepared.
Claims11
A method for improving the storage stability of an asphalt consisting of asphalt and a thermoplastic polymer selected from the group consisting of polyethylene, ethylene methacrylate, ethylene-propylene elastomer, ethylene-vinyl acetate, nylon, and mixtures thereof, or a thermoset polymer selected from the group consisting of polyimide, polyurethane, vulcanized rubber, cured elastomer and mixtures thereof, wherein said thermoplastic or thermoset polymers have a number average molecular weight of at least 10,000 which consists of adding a storage stability improving amount of a polymerized alpha-olefin prepared from an alpha-olefin of the formula ##STR4## where R is .sub.18 to C.sub.40 alkyl and R.sup.1 is hydrogen, wherein the polymerized alpha-olefin has a number averaged molecular weight of form about 500 to 5,000 and has a congealing and melting point which is essentially no higher than the congealing and melting point of the alpha-olefin from which it is prepared.
A storage stable asphaltic composition consisting of asphalt, from about 1 to about 20 wt % of a thermoplastic polymer selected from the group consisting of polyethylene, ethylene methacryalate, ethylenepropylene elastomer, ethylene-vinyl acetate, nylon and mixtures thereof, a thermoset polymer selected from the group consisting of polyimide, polyurethane, vulcanized rubber, cured elastomer and mixtures thereof, or a mixture thereof, wherein said thermoplastic or thermoset polymers have a number average molecular weight of at least 10,000 and from about 0,025 to about 10 wt % of a polymerized alpha-olefin prepared from an alpha-olefin of the formula ##STR5## where R is C.sub.18 to C.sub.40 alkyl and R.sup.1 is hydrogen, wherein the polymerized alpha-olefin has a number average molecular weight of from about 500 to 5,000 and has a congealing and melting point which is essentially no higher than the congealing and melting point of the alpha-olefin from which it is prepared.
Dependencies are inferred from the claim text.