C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/645
C08F 10/06 (2006.01) C08F 4/64 (2006.01) C08F 4/649 (2006.01)
Patent
CA 1316629
ABSTRACT OF THE DISCLOSURE A process for producing polypropylene having improved stiffness is disclosed, which comprises polymerizing propylene in multiple stages in the presence of a catalyst, which is prepared by reacting (i) an organoaluminum compound or (vi) a reaction product between the organoaluminum compound (i) and (a) an electron donor with (c) titanium tetrachloride to obtain (ii) a solid product, reacting the resulting solid product (ii) with (a) an electron donor and (b) an electron acceptor to obtain (iii) a solid product, and combining the resulting solid product (iii) with (iv) an organoaluminum compound and (v) an aromatic carboxylic acid ester at a molar ratio of the aromatic carboxylic acid ester to the solid product (v/iii molar ratio) of from 0.1 to 10.0, in such a manner that from 10 to 90% by weight of the total polymer is produced in the first stage and the balance of the total polymer is produced in the second and subsequent stages with the v/iii molar ratio of said catalyst being made higher than that in the catalyst used in the first stage by adding the aromatic carboxylic acid ester (v) to the polymerization system, while controlling a melt flow rate (MFR) of a polymer portion produced in each of the first and the subsequent stages so as to satisfy relationship: 0.5 < log(MFRH/MFRL) < 5.0 (1) wherein MFRH is an MFR of a polymer portion having the highest MFR; and MFRL is an MFR of a polymer portion having the lowest MFR.
595361
Chiba Hiromasa
Oka Takahiro
Chisso Corporation
Macrae & Co.
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