Process for producing a high-stiffness polypropylene and a...

Details Process for producing a high-stiffness polypropylene and a... Process for producing a high-stiffness polypropylene and a...

C - Chemistry, Metallurgy

08

F

402/645

C08F 110/06 (2006.01) C08F 210/06 (2006.01) C08F 297/08 (2006.01)

Patent

CA 2018829

A process for producing a highly transparent and highly stiff polypropylene affording a superior molded product is provided, which process comprises using a catalyst obtained by combining 1 a titanium trichloride composition (III) obtained by reacting TiC?4 with an organoaluminum compound (A1) or a reaction product (I) of (A1) with an electron donor (B1) to obtain a solid product (II), followed by subjecting the product (II) to a multi-stage polymeriza- tion treatment with a linear olefin and a non-linear olefin, each once or more times used, and further reacting the resulting linear olefin-non-linear olefin block copolymer with an electron donor (B2) and an electron acceptor, 2 an organoaluminum compound (A2); and as a third component, 3 an aromatic carboxylic acid ester (E) or an organo- silicon compound (S) having a Si-O-C bond and/or a mercapto group.

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