- Patent Title: Process for gas-phase polymerization having high bed bulk density
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Application No.: US13172969Application Date: 2011-06-30
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Publication No.: US10647790B2Publication Date: 2020-05-12
- Inventor: Ping Cai , Jan W. Van Egmond , Matthew J. Fedec , Jeffrey D. Goad , Robert C. Brady, III , Linfeng Chen
- Applicant: Ping Cai , Jan W. Van Egmond , Matthew J. Fedec , Jeffrey D. Goad , Robert C. Brady, III , Linfeng Chen
- Applicant Address: US MD Columbia
- Assignee: W. R. Grace & Co.-Conn.
- Current Assignee: W. R. Grace & Co.-Conn.
- Current Assignee Address: US MD Columbia
- Agency: Lerner, David, Littenberg, Krumholz & Mentlik, LLP
- Main IPC: C08F10/06
- IPC: C08F10/06 ; C08F110/06 ; C08F210/06
Abstract:
The present invention relates to an improvement for gas-phase olefin polymerization process having relatively high bed bulk density. The improvement involves the use of mixed external electron donors when polymerizing propylene in a gas-phase reactor having a polymer bed with a bulk density greater than 128 kg/m3, optionally with one or more comonomers, wherein the mixed electron donor system comprises at least a first external electron donor and a second external electron donor, and wherein the first external electron donor is a carboxylate compound.
Public/Granted literature
- US20130005923A1 PROCESS FOR GAS-PHASE POLYMERIZATION HAVING HIGH BED BULK DENSITY Public/Granted day:2013-01-03
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