Abstract: The present invention concerns Method for producing a unidirectional tape, the method comprising the steps of a) providing an impregnation slurry comprising primary particles and secondary particles, water, optionally an organic carrying medium, optionally an organic compound and optionally a surface active compound, and providing a unidirectional fiber layer having an average interstitial filament distance, wherein the primary particles comprise a first polymer and the primary particles have a particle size equal to or smaller than the average interstitial filament distance, and the secondary particles comprise a second polymer and the secondary particles have a particle size larger than the average interstitial filament distance, b) impregnating the unidirectional fiber layer with the impregnation slurry to form an impregnated unidirectional fiber web comprising an impregnated unidirectional fiber layer and a surface polymer layer, wherein the impregnated unidirectional fiber layer comprises, preferably con