Bituminous composition
AssigneeShell Oil Company
InventorsMajid Jamshed Chughtai, Jacques Colange, Denis Lebas, David Strickland
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Abstract
The invention provides a bituminous composition comprising a bitumen in an amount ranging from 20 to 80% wt, a copolymer comprising one or more vinyl aromatic compounds and one or more conjugated dienes, in an amount of 0.1 to 7 % wt, and sulphur in an amount of 20 to 60% wt, all percentages based on the weight of bitumen, copolymer and sulphur. It further provides a process for making this composition and asphalt compositions comprising such bituminous composition.
Claims14
A bituminous composition comprising a bitumen in an amount ranging from 20 to 80% wt, a copolymer comprising one or more vinyl aromatic compounds and one or more conjugated dienes, in an amount of 0.1 to 7% wt, and sulphur in an amount of 20 to 60% wt, all percentages based on the weight of bitumen, copolymer and sulphur.
A process for preparing an asphalt composition comprising the steps of:
- (i) heating bitumen;
- (ii) heating aggregate;
- (iii) mixing the hot bitumen with the hot aggregate in a mixing unit to form an asphalt composition;
- wherein from 20 to 60 wt % of sulphur, based on the weight of bitumen, copolymer and sulphur, is added in at least one of steps (i), (ii) or (iii);
- and
- wherein from 0.1 to 7 wt of copolymer, based on the weight of bitumen, copolymer and sulphur, is added in at least one of the steps (i), (ii) or (iii).
Dependencies are inferred from the claim text.