Patent Issued for Components and Catalysts for the Polymerization of Olefins

By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Hirahata, Wataru (Sodegaura, JP); Hanaoka, Hidenori (Suita, JP); Tanimoto, Masaya (Toyonaka, JP), filed on April 5, 2011, was cleared and issued on August 7, 2012.

The assignee for this patent, patent number 8236908, is Sumitomo Chemical Company, Limited (Tokyo, JP).

Reporters obtained the following quote from the background information supplied by the inventors: "It is known in the art that an internal electron donor has a great impact to a performance of a catalyst component for olefin polymerization. It is also known to use an alicyclic dicarboxylic diester as an internal electron donor.

"For example, JP2003-40918A discloses a solid catalyst component for olefin polymerization prepared by contacting with one another a magnesium compound, titanium tetrachloride, and a cyclohexenedicarboxlic diester; JP2001-114811A discloses a solid catalyst component for olefin polymerization obtained by contacting with one another a titanium compound, a magnesium compound, and a 1,2-cyclohexanedicarboxlic diester having a trans purity of 20% or more; and WO2006-077945 (corresponding to US2008/0097050A) discloses a solid catalyst component for olefin polymerization containing a titanium atom, a magnesium atom, a halogen atom, and a alicyclic and unsaturated alicyclic dicarboxylic diester having five to ten-membered ring structure."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "However, the above solid catalyst components do not give a catalyst for olefin polymerization having a satisfactory polymerization activity. An object of the present invention is to provide (1) a solid catalyst component for olefin polymerization which shows a sufficiently-high polymerization activity, (2) a process for producing such a solid catalyst component for olefin polymerization, (3) a process for producing a solid catalyst for olefin polymerization, and (4) a process for producing an olefin polymer.

"The present invention is a solid catalyst component for olefin polymerization comprising a titanium atom, a magnesium atom, a halogen atom, and a cycloheptapolyenedicarboxylic diester.

"Also, the present invention is a process for producing the above solid catalyst component, comprising a step of contacting with one another a titanium compound, a magnesium compound, and a cycloheptapolyenedicarboxylic diester. This production process is hereinafter referred to as 'catalyst component production process (1)'.

"Further, the present invention is a process for producing the above solid catalyst component, comprising a step of contacting a solid component comprising a titanium atom and a magnesium atom with a cycloheptapolyenedicarboxylic diester. This production process is hereinafter referred to as 'catalyst component production process (2)'.

"Still further, the present invention is a process for producing a solid catalyst for olefin polymerization, comprising a step of contacting with one another the above solid catalyst component, an organoaluminum compound, and an optional external electron donor.

"Moreover, the present invention is a process for producing a solid catalyst for olefin polymerization, comprising a step of contacting with one another a solid catalyst component produced by above catalyst component production process (1), an organoaluminum compound, and an optional external electron donor.

"Also, the present invention is a process for producing a solid catalyst for olefin polymerization, comprising a step of contacting with one another a solid catalyst component produced by above catalyst component production process (2), an organoaluminum compound, and an optional external electron donor.

"Also, the present invention is a process for producing an olefin polymer, comprising a step of polymerizing an olefin in the presence of a solid catalyst produced by any one of the above three production processes. The above solid catalyst component for olefin polymerization is simply referred to hereinafter as 'solid catalyst component'."

For more information, see this patent: Hirahata, Wataru; Hanaoka, Hidenori; Tanimoto, Masaya. Components and Catalysts for the Polymerization of Olefins. U.S. Patent Number 8236908, filed April 5, 2011, and issued August 7, 2012. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=70&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=3493&f=G&l=50&co1=AND&d=PTXT&s1=20120807.PD.&OS=ISD/20120807&RS=ISD/20120807

Keywords for this news article include: Titanium, Light Metals, Nanotechnology, Organoaluminum, Inorganic Chemicals, Magnesium Compounds, Emerging Technologies, Sumitomo Chemical Company Limited.

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