Patent ID: 6365682
Filing Date: 2002-04-02
Classification: B01J,C08F,Y10S

Abstract:
A process for producing terpolymers of propylene and at least two different alpha-olefins, said terpolymers having a low melting point, wherein the process is carried out in at least one slurry reactor in the presence of catalysts at elevated temperature, comprising the following steps:a) feeding into a slurry reactor a reaction mixture containing 50-85 wt-% of propylene, 1-10 wt-% of ethylene, 15-40 wt-% of other C4-C8 alpha-olefin, a catalyst system capable of providing olefin polymerization at said temperature conditions, and optionally hydrogen, b) polymerizing said reaction mixture at a temperature of less than 70Â° C. a sufficient time to obtain a propylene terpolymer amounting to 50-99 wt-% of the end product, c) transferring said reaction mixture into a gas phase reactor operated at a pressure of higher than 5 bars, and d) continuing polymerization in said gas phase reactor for producing a propylene terpolymer amounting to 1 to 50 wt-% of the end product, whereby a terpolymer is obtained having a melting temperature of less than 135Â° C.