C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/287, 402/588
C08F 6/02 (2006.01) C08F 6/26 (2006.01) C08F 10/00 (2006.01)
Patent
CA 1111198
ABSTRACT OF THE DISCLOSURE A process for purifying propylene homopolymers or copolymers which comprises: (i) polymerizing or copolymerizing propylene with other unsaturated hydrocarbon monomers in liquid propylene in the presence of a catalyst system consisting essentially of (a) an activated titanium trichloride obtained by reducing titanium tetrachloride with an organo-aluminum compound followed by activation and (b) an organo-aluminum compound; (ii) introducing the resulting polymer slurry into an upper portion of a counter-current washing tower to counter- currently contact the polymer slurry with a C3-C8 alcohol and liquid propylene, whereby said catalyst is deactivated and at the same time the propylene homopolymers or copolymers dissolved in the polymer slurry and the catalyst are removed by washing, wherein said alcohol is used in an amount 0.1 to 50 times by mole based on said organo-aluminum compound (b) and is supplied to the washing tower lower than the point of introduction of said polymer slurry, and said liquid propylene is supplied to a lower portion of the washing tower; and (iii) then after removing volatile monomers by flashing, contacting the powdery propylene homopolymers or copolymers with a gaseous epoxide at a temperature lower than melting point of said polymer or copolymer.
316139
Kakugo Masahiro
Matsuyama Kiyoshi
Shiga Akinobu
Suzuki Takatoshi
George H. Riches And Associates
Sumitomo Chemical Co. Ltd.
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