Process for the production of purified propylene homopolymers or

Details Process for the production of purified propylene homopolymers or Process for the production of purified propylene homopolymers or

Filed on

1981-10-23

Date issued

1984-07-24

Examiner

Henderson, C. A.

Patent Class

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

SubClass

Synthetic resins

SubSubClass

Polymers from only ethylenic monomers or processes of...

Other Related Categories

526137, 526142, 528494, 528502, 528503, C08F 608, C08F 464

Type

Patent

Status

active

Patent number

044618816

Description

ABSTRACT:
In a process for producing a homopolymer or a copolymer of propylene comprising polymerizing propylene or copolymerizing propylene and at least one other unsaturated hydrocarbon monomer in liquid propylene using a catalyst system containing activated titanium trichloride (a) and an organoaluminum compound (b), the activated titanium trichloride (a) being prepared by reducing titanium tetrachloride with an organoaluminum compound followed by activation, to produce a polymer slurry; introducing the polymer slurry produced into the top of a counter-current washing tower; and washing the polymer slurry by counter-currently contacting the polymer slurry with liquid propylene introduced into the bottom of the washing tower, the improvement which comprises purifying the homopolymer or copolymer of propylene by feeding an epoxide in a molar amount of about 1 to about 15 times the molar amount of the total of activated titanium trichloride (a) and organoaluminum compound (b), to a part of said washing tower, thereby deactivating the catalyst and removing the catalyst residue and the homopolymer or copolymer of propylene dissolved in the polymer slurry.

REFERENCES:
patent: 2974132 (1961-03-01), Jacobi
patent: 4053697 (1977-10-01), Asada
patent: 4117219 (1978-09-01), Kakogawa
patent: 4182852 (1980-01-01), Shiga
patent: 4195145 (1980-03-01), Shiga

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