Process for producing propylene copolymer

Details Process for producing propylene copolymer Process for producing propylene copolymer

1993-12-21

1995-06-27

Delmendo, Romulo H.

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

Synthetic resins

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

525 53, 525266, 525268, 525270, 525322, 525323, C08F29708

Patent

active

054281105

ABSTRACT:
A process for producing a copolymer of propylene and other .alpha.-olefins in the presence of a catalyst comprising a titanium-containing solid catalyst component and an organoaluminum compound is disclosed. The process comprises (1) a first step in which propylene is homopolymerized or propylene and a minor proportion of other .alpha.-olefin are copolymerized to prepare polymer particles having a pore volume of from 0.15 to 0.30 cm.sup.3 /g, and (2) a second step in which propylene and other .alpha.-olefin are copolymerized in the presence of said polymer particles. The resulting propylene copolymer particles have improved fluidity and high bulk density.

REFERENCES:
patent: 4483966 (1984-11-01), Suzuki et al.
patent: 4547552 (1985-10-01), Toyota et al.
patent: 4739015 (1988-04-01), Toyota et al.
patent: 4820775 (1989-04-01), Shiga et al.

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