The stereoblock polymer according to the invention is a polymer of a 1-olefin of the formula R-CH???CH2 in which R denotes an alkyl radical having 1 to 28 carbon atoms, preferably 1 to 10 carbon atoms, in particular one carbon atom, for example propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, or 1-octene.