POLYURETHANE MATERIAL, PROCESS FOR PREPARING SUCH MATERIAL AND PROTECTIVE COVER FOR WIND TURBINE BLADE

The polyurethane material is prepared from a polyol, butanediol, and an isocyanate. The protective cover (1) is adapted to be attached along at least a part of a longitudi- nal edge (3) of the wind turbine blade by adhesion of an inside (4) of the protective cover to a surface (5) of the longitudinal edge of the wind turbine blade. The protective cover is elongated in a longitudinal direction (D) and has an at least substantially U- formed cross-section. The protective cover includes a central cover section extending in the longitudinal direction and two peripheral cover sections extending in the longitu- dinal direction at either side of the central cover section, respectively. The central cov- er section has a minimum thickness of at least 1 millimetre, and each peripheral cover section has a thickness decreasing from a maximum thickness of at least 1 millimetre to a minimum thickness of less than 1/2 millimetre.