Polymer bitumen compsns. based on bitumen and 2-20 % of a polymer component comprising EVA copolymer with grafted maleic anhydride-styrene side chains, having a melt index of 1-80 g/10 min at 190 deg C /21.19 N, a vinyl acetate content of 10-40 wt.% a maleic anhydride content of 1-8 wt.% and a styrene content of 1-12 wt.%.
