The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 2015
Filed:
Jan. 12, 2012
Michael D. Jensen, Laurel, MD (US);
Michael J. Elder, Baltimore, MD (US);
Andrew G. Singleton, Ellicott City, MD (US);
Stephen R. Schmidt, Silver Spring, MD (US);
Patrick J. Kerwin, Grasonville, MD (US);
John H. Hain, Jr., Woodstock, MD (US);
Fengjun Hua, Ellicott City, MD (US);
Michael D. Jensen, Laurel, MD (US);
Michael J. Elder, Baltimore, MD (US);
Andrew G. Singleton, Ellicott City, MD (US);
Stephen R. Schmidt, Silver Spring, MD (US);
Patrick J. Kerwin, Grasonville, MD (US);
John H. Hain, Jr., Woodstock, MD (US);
Fengjun Hua, Ellicott City, MD (US);
W. R. Grace & Co.-Conn., Columbia, MD (US);
Abstract
Olefin polymerization catalysts or catalyst systems comprising a mixture, contact product, reaction product or complex comprising as elements or components: (A) at least one metallocene pre-catalyst compound or polymerization active metallocene compound; (B) at least one titanium containing metallocene compound; and when (A) is a metallocene pre-catalyst compound, (C) at least one activator; provided however: (I) the titanium-containing metallocene compound is inactive or substantially inactive for the polymerization of olefins prior to or concurrently with the use of the catalyst system for olefin polymerization. Also disclosed are processes for producing the catalyst system and polyolefins having desirable combinations of properties, including melt index and molecular weight distribution, which properties are particularly desirable for the manufacture of polyolefin film products, especially LLDPE film A preferred catalyst comprises a zirconium or hafnium metal containing metallocene, an inactivated titanocene and a SiO2 support carrier.