Asphalt compositions
AssigneeThe B. F. Goodrich Company
InventorsJames Churchill Healy, Roy Francis Whitaker
Life of this patent
Estimating the term…
Abstract
Asphalt cement compositions are produced which contain an EPDM or EPM elastomer. The elastomer is premixed with a high DBP absorption value reinforcing carbon black to form a bound rubber masterbatch. The specific gravity of the masterbatch is substantially equivalent to the specific gravity of the asphalt cement or asphalt.
Claims14
An asphalt composition containing 100 parts by weight of an asphalt and from about 1 to about 30 parts by weight of a bound rubber masterbatch consisting of at least one elastomer selected from the group consisting of ethylene-propylene-diene terpolymer and ethylene-propylene copolymer and at least one carbon black having a dibutyl phthalate absorption value greater than 120 wherein said elastomer is first premixed with said carbon black to form a bound rubber masterbatch, and said masterbatch is then mixed with said asphalt, and the quantity of said carbon black that is first premixed with said elastomer is sufficient to increase the specific gravity of the bound rubber masterbatch to a value within 0.2 gram per cubic centimeter of the specific gravity of the asphalt cement.
A method of producing an asphalt composition containing 100 parts by weight of an asphalt and from about 1 to about 30 parts by weight of a bound rubber masterbatch consisting of at least one elastomer selected from the group consisting of ethylene-propylene-diene terpolymer and ethylene-propylene copolymer and at least one carbon black having a dibutyl phthalate absorption value greater than 120 wherein said elastomer is first premixed with said carbon black to form a bound rubber masterbatch and then said masterbatch is mixed into the asphalt, and the quantity of said carbon black that is first premixed with said elastomer is sufficient to increase the specific gravity of the bound rubber masterbatch to a value within 0.2 gram per cubic centimeter of the specific gravity of the asphalt cement.
Dependencies are inferred from the claim text.