Bitumen composition with improved ageing resistance
AssigneeNederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO
InventorsHartmut Rudolf Fischer, Bart Bos
Life of this patent
Estimating the term…
Abstract
The invention provides a bitumen composition comprising a bitumen and a modified clay which clay is obtainable by subjecting a clay having a layered structure to a treatment with a compound that is selected from the group consisting of onium compounds having the general formulae (R1R2R3R4X)+ or (R1R2Y)+, wherein X represents N or P, Y represents S, and wherein at least one of R1-R4 represents an aromatic hydrocarbon substituent, a hydroxyl or amino functionalized aliphatic hydrocarbon substituent or a poly(ethyleneoxide) substituent. The invention further provides a process for preparing said bitumen, an asphalt composition comprising aggregate and said bitumen composition, and the use of said bitumen composition in an asphalt composition for road applications.
Claims23
An open graded asphalt composition having a void content of more than 10%, said composition comprising aggregate and a bitumen composition comprising a bitumen and a modified clay which clay is obtainable by subjecting a clay having a layered structure to a treatment with a compound that is selected from the group consisting of onium compounds having the general formulae (R1R2R3R4X)+ or (R1R2R3Y)+, wherein X represents N or P, Y represents S, and wherein at least one of R1-R4 represents an aromatic hydrocarbon substituent, a hydroxyl or amino functionalized aliphatic hydrocarbon substituent or a poly(ethyleneoxide) substituent.
A process for increasing the oxidative ageing resistance of an open graded asphalt composition having a void content of more than 10% comprising aggregate and bitumen to which has been added a modified clay which clay is obtainable by subjecting a clay having a layered structure to a treatment with a compound that is selected from the group consisting of onium compounds having the general formulae (R1R2R3R4X)+ or (R1R2R3Y)+, wherein X represents N or P, Y represents S, and wherein at least one of R1-R4 represents an aromatic hydrocarbon substituent, a hydroxyl or amino functionalized aliphatic hydrocarbon substituent or a poly(ethyleneoxide) substituent.
Dependencies are inferred from the claim text.