abstract |
ETHYLENE IS HOMOPOLYMERISED, OR COPOLYMERIZED WITH OTHER ALPHA OLEFINS, WITH A CATALYST COMPRISING PI-BONDED CHROMIUM COMPOUND SUPPORTED ON INORGANIC OXIDE AND THERMALLY AGED IN AN INERT ATMOSPHERE. THE THERMAL AGING OF THE CATALYST CHANGES THE MELT INDEX AND UNSATURATION CHARACTERISTICS OF THE POLYMERS MADE THEREWITH. |