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:
Feb. 23, 2021
Filed:
Apr. 17, 2019
Applicant:
W. R. Grace & Co.-conn., Columbia, MD (US);
Inventor:
Linfeng Chen, Missouri City, TX (US);
Assignee:
W. R. Grace & Co.-Conn., Columbia, MD (US);
Primary Examiner:
Int. Cl.
CPC ...
B01J 31/00 (2006.01); B01J 31/02 (2006.01); B01J 8/18 (2006.01); C08F 10/02 (2006.01); C08F 10/06 (2006.01); C08F 110/06 (2006.01); B01J 31/12 (2006.01); B01J 31/14 (2006.01); B01J 31/22 (2006.01); C08F 210/06 (2006.01);
U.S. Cl.
CPC ...
B01J 8/1872 (2013.01); B01J 8/1809 (2013.01); C08F 10/02 (2013.01); C08F 10/06 (2013.01); C08F 110/06 (2013.01); B01J 31/0201 (2013.01); B01J 31/0212 (2013.01); B01J 31/0272 (2013.01); B01J 31/128 (2013.01); B01J 31/143 (2013.01); B01J 31/2213 (2013.01); B01J 31/2226 (2013.01); C08F 210/06 (2013.01); C08F 2400/02 (2013.01);
Abstract
The present disclosure provides a Ziegler-Natta catalyst composition comprising a procatalyst, a cocatalyst and a mixed external electron donor comprising a first selectivity control agent, a second selectivity control agent, and an activity limiting agent. A polymerization process incorporating the present catalyst composition produces a high-stiffness propylene-based polymer with a melt flow rate greater than about 50 g/10 min. The polymerization process occurs in a single reactor, utilizing standard hydrogen concentration with no visbreaking.