Method of graft polymerizing monomers onto a shaped article of peroxidized polymers of propylene and copolymers of propylene and ethylene

Claim 1

A PROCESS FOR THE PRODUCTION OF SHAPED ARTICULES COMPRISING LINEAR HIGH MOLECULAR WEIGHT POLYMERS SELECTED FROM THE GROUP CONSISTING OF ISOTACTIC POLYMERS OF PROPYLENE, NON-ISOTACTIC POLYMERS OF PROPYLENE AND NON-ISOTACTIC COPOLYMERS OF PROPYLENE AND ETHYENE, AND HAVING GRAFTED THERON POLYMERIC CHAINS FORMED BY THE POLYMERIZATION OF A MONOMER WHICH IS POLYMERIZABLE BY A RADICAL MECHANISM, SAID PROCESS COMPRISING FIRST CONTACTING THE SHAPED ARTICULES WITH A GAS CONTAINING MOLECULAR OXYGEN AT A TEMPERATURE OF 50 TO 120*C. UNTIL A PREDETERMINED AMOUNT OF OXYGEN IS BOUND TO THE POLYMER CHAINS IN THE FORM OF HYDROPEROXIDE GROUPS, AND THEREAFTER IMMERSING THE ARTICLE, UNDER POLYMERIZED, CONDICTIONS, IN A MONOMER CAPABLE OF BEING POLYMERIZED WITH A RADICAL MECHANISM, WHEREBY SAID MONOMER IS POLYMERIZED, WITH THE AID OF THE HYDROPEROXIDE GROUPS BOUND TO THE POLYMER COMPRISING THE SHAPED ARTICULE, TO POLYMERIC CHAINS WHICH ARE CHEMICALLY GRAFTED ONTO THE POLYMERIC LINEAR CHAIN OF SAID ARTICLE.