A-B-A block copolymer of propylene or of other olefins, of polystyrene, ethylene-butylene copolymer and polystyrene, containing by weight <= 35% of styrene, in blocks of irregular shape, lumps, powders, granules, flakes and similar bulk forms
A-B-A blok-kopilimer polistirena, kopolimer etilen-butilena in polistirena