Patent ID: 7803222
Filing Date: 2010-09-28
Classification: C08L

Abstract:
1. 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 (R 1 R 2 R 3 R 4 X) + or (R 1 R 2 R 3 Y) + , wherein X represents N or P, Y represents S, and wherein at least one of R 1 -R 4 represents an aromatic hydrocarbon substituent, a hydroxyl or amino functionalized aliphatic hydrocarbon substituent or a poly(ethyleneoxide) substituent.