Use of an additive for reducing the preparation time of a polymer-modified bitumen composition in a process which comprises blending: (a) from 0.5 to 5 wt%, by weight of the polymer-modified bitumen composition, of a fully or partially hydrogenated block copolymer; (b) from 85.0wt% to 99.4 wt%, based on the total weight of the polymer-modified bitumen composition, of a bitumen component; (c) from 0.1 to 10 wt%, by weight of the polymer-modified bitumen composition, of an additive selected from (i) polyphosphoric acid, (ii) a flux component selected from aromatic, naphthenic or paraffinic flux oils, and petroleum extracts, and mixtures thereof; and (iii) mixtures of (i) and (ii); and (d) optionally one or more additional components.
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