Propylene (co)polymer and process for the preparation of the same

A process for the preparation of a propylene (co)polymer having a polymerizable group represented by the following general formula ##STR11## at one terminal thereof, comprising the steps of:

• (a) (co)polymerizing propylene in the presence of polymerization catalysts comprising a catalyst component (x) containing a vanadium compound represented by the general formula (III):
• ##STR12## wherein R.sup.3 to R.sup.5 each represents a hydrogen atom or a hydrocarbyl group having 1 to 8 carbon atoms, except a case wherein the three groups are simultaneously hydrogen atoms, and an organometallic compound (y) having a metal of a Group I, II or III of the periodic table to form a propylene (co)polymer having a reactive terminal;
• (b) reacting the propylene (co)polymer having a reactive terminal of step (a) with an aromatic divinyl compound represented by the following general formula (IV):
• ##STR13## wherein the relative position of the two substituents on the benzene ring may be any of the o-, m- and p-positions;
• and (c) reacting the resulting propylene (co)polymer of step (b) with a proton donor or a halogen molecule.