Stabilization of polyolefines with alkaline stabilizers

Claim 1

THE PROCESS FOR REDUCING THE CORROSIVITY WITH RESPECT TO FERROUS METALS AT ELEVATED TEMPERATURES AND PRESSURES OF A HIGH-MOLECULAR WEIGHT SOLID POLYMER SELECTED FROM THE CLASS CONSISTING OF POLYETHYLENE AND POLYPROPYLENE, SAID POLYMER HAVING BEEN PREPARED BY SUBJECTING THE CORRESPONDING MONOMER TO POLYMERIZING CONDITIONS IN THE PRESENCE OF A POLYMERIZATION CATALYST OBTAINED BY ADMIXING AN ORGANO-ALUMINUM COMPOUND SELECTED FROM THE CLASS CONSISTING OF ALUMINUM TRIALKYLS AND DIALKYL ALUMINUM HALIDES WITH A REDUCIBLE COMPOUND OF A METAL OF GROUPS IVB TO VIB OF THE PERIODIC TABLE, AND SAID POLYMER CONTAINING NORMALLY INCIDENT IMPURITIES WHICH RENDER IT CORROSIVE WITH RESPECT TO FERROUS METALS AT MOLDING TEMPERATURES AND PRESSURES, WHICH PROCESS CONSISTS IN ADMIXING SAID SOLID POLYMER WITH A DISPERSION OF AN ALKALINE MATERIAL IN A LIQUID VEHICLE WHICH IS A NON-SOLVENT FOR SAID SOLID POLYMER, SAID ALKALINE MATERIAL BEING SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL HYDROXIDES, ALKALINE EARTH METAL OXIDES AND ORGANIC ALKALIES BOILING ABOVE 150*C., THEREAFTER REMOVING SAID LIQUID VEHICLE FROM SAID SOLID POLYMER AND DEPOSITING A SUFFICIENT AMOUNT OF SAID ALKALINE MATERIAL ON SAID SOLID POLYMER TO REDUCE SUBSTANTIALLY THE CORROSIVITY OF SAID POLYMER WHEN THE MIXTURE OF SOLID POLYMER AND ALKALINE MATERIAL IS SUBJECTED TO MOLDING TEMPERATURES AND PRESSURES.