Showa Denko K.k.

Japan Polyolefins Co., Ltd.

Showa Denko Kabushiki Kaisha

Basell Poliolefine Italia, S.p.a.

Hirotoshi Takahashi

Hisayoshi Yanagihara

Kazuyuki Watanabe

Satoshi Iwamoto

Kazuharu Itoh

Masaki Fushimi

Yasushi Kuroda

Shintaro Inazawa

Shinya Waki

Koichi Sekiya

The present invention relates to catalyst components for the polymerization of olefins comprising a titanium compound, having at least a Ti-halogen bond, and at least two electron donor compounds supported on a Mg dihalide, said catalyst component being characterized by the fact that at least one of the electron donor compounds is selected from ethers containing two or more ether groups which are further characterized by the formation of complexes with anhydrous magnesium dichloride in an amount less than 60 mmoles per 100 g of MgCland by the failure of entering into substitution reactions with TiClor by reacting in that way for less than 50% by moles, and at least another electron donor compound is selected from esters of mono or polycarboxylic acids. Said catalyst components are able to produce propylene polymers which, for high values of xylene insolubility, show a broad range of isotacticity.

Catalyst for the polymerization of olefins

There are provided a propylene-based polymer characterized in that (1) the xylene-extraction insoluble portion (XI) is 99.0 wt % or greater, (2) the isotactic pentad ratio (IP) is 98.0% or greater as measured by,C nuclear magnetic resonance spectroscopy, (3) the isotactic average chain length (N) is 500 or greater, and (4) the total amount of each of the fractions obtained by column separation of the xylene insolubles whose average chain length (N,) is 800 or greater accounts for 10 wt % or more of the entirety, and a method for its production, as well as a propylene-based polymer composition prepared by combining with this propylene-based polymer at least a nucleating agent in the range of 0.05-15 wt %. In addition, there are provided a polymerization catalyst component allowing the production of such a propylene-based polymer, and a method for its production.

Propylene-based polymer, method for its production, composition thereof, catalyst component for polymerization, and method for its production

Propylene-based polymer, method of its production, composition thereof,

Solid catalyst components for olefin polymerization which comprise a solid carrier components comprising a solid substance having the general formula

Solid catalyst components for olefin polymerization

A process for producing a catalyst carrier for an olefin polymerization comprising:

Process for producing catalyst carrier for olefin polymerization

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Oita, Japan

Hirotoshi Takahashi