Caps and closures comprising a propylene random copolymer, and a method for producing them

Cap or closure consisting of a polypropylene composition, which comprises at least 70 wt %, relative to the total weight of said polypropylene composition, of a random copolymer of propylene and at least one comonomer, said at least one comonomer being different from propylene, wherein said random copolymer has a comonomer content of at most 4.0 wt %, relative to the total weight of said random copolymer, a molecular weight distribution, defined as Mw/Mn, of at most 4.0 and a percentage of 2,1-insertions of at least 0.1%, relative to the total number of propylene molecules in the polymer chain.