Japan Polypropylene Corporation

Keiji Fukuda

Takanori Nakashima

Yoshitaka Kobayashi

Iku Kouzai

Kouji Nakayama

Yuusuke Yamada

Youichi Maeda

Akio Tanna

Shigeo Mizukami

Shouichi Ida

A method for producing a solid catalyst component (Aa) for &#x3b1;-olefin polymerization, which includes: bringing components (A1) to (A4) into contact with one another in an inert solvent; and without washing the contact product with an inert solvent, aging the contact product by keeping for a holding time of 3 days or more and 180 days or less, regarding the time point that all of the components (A1) to (A4) first come into contact, as a starting point.

Method for producing solid catalyst component for &#x3b1;-olefin polymerization and method for producing &#x3b1;-olefin polymer using the same

Disclosed is a production method of polypropylene having high MFR value and excellent product qualities with high productivity. The method enables to produce a propylene polymer by a gas phase process where the reaction heat is removed mainly by the heat of vaporization of liquefied propylene. The method is characterized by using a solid catalyst component (A) which is prepared by contacting components (A1), (A2) and (A3) shown below. Further disclosed are: a propylene polymer produced by the method; a propylene polymer composition; and a molded body of the composition. Component (A1): a solid component containing titanium, magnesium and a halogen as essential components. Component (A2): a vinyl silane compound. Component (A3): an organosilicon compound having an alkoxy group (A3a) and/or a compound having at least two ether bonds (A3b).

Propylene-based polymer and production method therefor, propylene-based polymer composition and molded body made thereof

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Yokkaichi, Japan

Keiji Fukuda