Two-phase ethylene-propylene block copolymerization process

Details Two-phase ethylene-propylene block copolymerization process Two-phase ethylene-propylene block copolymerization process

1981-07-16

1982-06-08

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525243, 525247, 525323, C08F29708

Patent

active

043340415

ABSTRACT:
A process for the preparation of ethylene-propylene block copolymers at improved catalyst productivity rates involving the formation of a propylene prepolymer by polymerization of propylene in liquid phase in the presence of a catalyst system containing titanium halide supported on magnesium halide and aluminum alkyl complexed with an electron donor. Ethylene and propylene are block polymerized onto the prepolymer in a vapor phase reaction zone in the presence of further added quantities of similar catalyst components. The product of the process has higher ethylene and block contents as compared to products formed with none or only one of the components being added to the vapor phase reaction zone.

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