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:
Aug. 23, 2022
Filed:
Apr. 10, 2018
W.r. Grace & Co.-conn, Columbia, MD (US);
Jan W. Van Egmond, Charleston, WV (US);
John K. Kaarto, Missouri City, TX (US);
W.R. GRACE & CO.-CONN, Columbia, MD (US);
Abstract
A process comprising polymerizing propylene and an olefin comonomer selected from Cor C-Cwith a Ziegler Natta catalyst system and hydrogen in a single gas-phase reactor, to form a propylene polymer, at a temperature range of from 78 to 92° C. with a H/Cmolar ratio of 0.005 to 0.25, the catalyst system comprising: a solid catalyst component comprising a transition metal compound, a Group 2 metal compound, an internal electron donor comprising a substituted phenylene aromatic di ester; an activity limiting agent; an organo-aluminum compound; and an external electron donor composition comprising at least one silane, wherein if the olefin comonomer is ethylene it is present in the propylene polymer in an amount from 1.0-7.0 wt % based on the total weight of the propylene polymer, and if the olefin comonomer is C-C, it is present in an amount from 1.0-15.0 mol % based on the total amount of the propylene polymer.