Process for producing propylene homopolymers and copolymers

Details Process for producing propylene homopolymers and copolymers Process for producing propylene homopolymers and copolymers

1975-01-16

1977-10-11

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526135, 526136, 526137, 526139, 526140, 526151, 526154, 526159, 526351, 528498, 252429B, C08F 416

Patent

active

040536971

ABSTRACT:
A process for producing a homopolymer of propylene or a copolymer of propylene which comprises polymerizing propylene or a mixture of propylene and another unsaturated hydrocarbon monomer such as ethylene in liquid propylene, in the presence of a catalyst system consisting essentially of (a) an activated titanium compound obtained by reducing titanium tetrachloride with an organic aluminum compound and activating the resulting titanium compound and (b) an organic aluminum compound to produce a polymer slurry, introducing the polymer slurry into an upper part of a counter-current washing zone, such as a washing tower, and counter-currently contacting the polymer slurry with liquid propylene which is introduced into a lower part of the washing zone, whereby the polymer and catalyst residues dissolved in the polymer slurry are removed.

REFERENCES:
patent: 2558557 (1951-06-01), Hess et al.
patent: 3074921 (1963-01-01), Carter
patent: 3280090 (1966-10-01), Scoggin
patent: 3825524 (1974-07-01), Wada et al.

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