Method for polymerizing alpha-olefin
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United States of America Patent
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May 31, 2016
Grant Date -
May 29, 2014
app pub date -
Jul 3, 2012
filing date -
Jul 6, 2011
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Abstract
The purpose of the present invention is to produce an alpha-olefin polymer having excellent production stability utilizing a long-lasting high catalytic activity. Provided is a method for producing an alpha-olefin polymer using a catalyst comprising:
- (A) a solid catalyst component comprising, as essential components, magnesium, titanium, a halogen and an electron donor compound;(B) an organoaluminum compound; and(C) an electron donor compound,the method comprising:(1) pre-polymerizing an alpha-olefin in the presence of the components (A) and (B) to produce a pre-polymerized catalyst;(2) bringing the resultant pre-polymerized catalyst into contact with a contact product that is produced by contacting the components (B) and (C) with each other in advance; and(3) adding the pre-polymerized catalyst that has been contacted with the contact product to a polymerization reaction vessel in which an alpha-olefin is introduced to polymerize the alpha-olefin.
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