Modified bitumen comprising a compatibilizer, a compatibilizer and its use in asphalt, roofing or road applications

A composition comprising:

• bitumen;
• and
• a graft copolymer containing randomly hydroxyl functionalized polyolefin and styrene-maleic-anhydride copolymer (PO-graft-SMA), wherein the amount of PO is between 60 and 95 wt % based on the weight of the PO-graft-SMA, and the amount of SMA is between 5 and 40 wt % based on the weight of the PO-graft-SMA, where the PO is a polyolefinic thermoplast, a polyolefin plastomer (POP) or polyolefin elastomer (POE).

A composition comprising:

• bitumen;
• and
• a graft copolymer containing randomly hydroxyl functionalized polyolefin and styrene-maleic-anhydride copolymer (PO-graft-SMA), wherein the amount of PO is between 60 and 90 wt % based on the weight of the PO-graft-SMA, and amount of SMA is between 10 to 40 wt % based on the weight of the PO-graft-SMA.