US Patent 7879960 Process for producing propylene polymer

Patent 7879960 was granted and assigned to Mitsui Chemicals on February, 2011 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Mitsui Chemicals

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7879960

Date of Patent

February 1, 2011

Patent Application Number

11661504

Date Filed

August 29, 2005

Patent Primary Examiner

‌

Caixia Lu

Patent abstract

A high molecular weight propylene polymer exhibiting high stereoregularity (isotactic) and high position selectivity can be effectively produced by polymerizing at least one monomer selected from propylene, α-olefins and polyenes in the presence of a catalyst for olefin polymerization comprising:(A) a bridged metallocene compound represented by the General Formula [I] given in claims (diphenylmethylene(3-tert-butyl-5-ethyl-cyclopentadienyl)(fluorenyl)zirconium dichloride, etc.); and(B) one or more compound(s) selected from(b-1) an organoaluminumoxy compound(b-2) a compound which reacts with the bridged metallocene compound (A) to form an ion pair, and(b-3) an organoaluminum compound.