Patent ID: 6060542
Filing Date: 2000-05-09
Classification: C08J,C08L

Abstract:
A process for preparing a bitumen composition comprising blowing a mixture with an oxygen-containing gas which mixture comprises a bitumen having a penetration of less than 300 dmm (as measured by ASTM D 5 at 25.degree. C.), a thermoplastic rubber, wherein the thermoplastic rubber comprises a block copolymer according to the formulae A(BA).sub.m or (AB).sub.n X wherein A represents a block of predominantly poly(monovinyl-aromatic hydrocarbon) and wherein B represents a block of predominantly poly(conjugated diene), wherein X represents the residue of a multivalent coupling agent and wherein n is an integer >1 and m is an integer >1, which is present in an amount of less than 10% w, and a bitumen blowing catalyst which is present in an amount of more than 0.5% by weight and up to 3% by weight, both based on total mixture.