C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2057
C08F 297/08 (2006.01)
Patent
CA 1164129
Title of the Invention IMPROVED PROCESS FOR THE PRODUCTION OF A PROPYLENE-CONTAINING BLOCK COPOLYMER Abstract of the Disclosure In d multi-step process for the production of a pro- pylene-containing block copolymer which comprises (I) polymerizing propylene or propylene with up to about 5 mole% of another olefin by suspension polymerization in the presence of a catalyst composed of (A) a highly active solid titanium catalyst com- ponent containing magnesium, titanium, halogen and an electron donor as essential ingredients, (B) an organoaluminum compound, and (C) an electron donor, and (II) copolymerizing propylene with at least one olefin by gas-phase polymerization in the presence of the catalyst- containing polymer obtained in step (I); the improvement wherein (i) step (I) is carried out under such conditions that the mole ratio of Al to the electron donor in the catalyst components (B) and (C) is from about 1 to about 15, and (ii) after the amount of the polymer formed in step (I) reaches 70% of that of the polymer finally obtained in step (I), component (8) or both components (B) and (C) are freshly added in such an amount that the mole ratio of Al to the total electron donor in the polymerization or copolymeriza- tion system is from about 0.1 to about 20, and thereafter the polymerization or copolymerization is carried out in the further presence of the component (B) or the components (B) and (C) so added.
374437
Kashiwa Norio
Toyota Akinori
Mitsui Chemicals Inc.
Smart & Biggar
LandOfFree
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