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:
Mar. 04, 2025
Filed:
May. 14, 2024
Chevron Phillips Chemical Company Lp, The Woodlands, TX (US);
Errun Ding, Mason, OH (US);
Chung Ching Tso, Bartlesville, OK (US);
Max P. McDaniel, Bartlesville, OK (US);
Ashish M. Sukhadia, Bartlesville, OK (US);
Youlu Yu, Bartlesville, OK (US);
Randall S. Muninger, Dewey, OK (US);
Aaron M. Osborn, Bartlesville, OK (US);
Christopher E. Wittner, Bartlesville, OK (US);
Chevron Phillips Chemical Company LP, The Woodlands, TX (US);
Abstract
Disclosed herein are ethylene-based polymers generally characterized by a melt index of less than 15 g/10 min, a density from 0.91 to 0.945 g/cm, a CY-a parameter at 190° C. from 0.2 to 0.6, an average number of long chain branches per 1,000,000 total carbon atoms of the polymer in a molecular weight range of 500,000 to 2,000,000 g/mol of less than 5, and a maximum ratio of η/3η at an extensional rate of 0.03 secin a range from 3 to 15. The ethylene polymers have substantially no long chain branching in the high molecular weight fraction of the polymer, but instead have significant long chain branching in the lower molecular weight fraction, such that polymer melt strength and bubble stability are maintained for the fabrication of blown films and other articles of manufacture. These ethylene polymers can be produced using a dual catalyst system containing a single atom bridged metallocene compound with an indenyl group and a cyclopentadienyl group, and an unbridged hafnium metallocene compound with two cyclopentadienyl groups.