Invention Grant
- Patent Title: Process for preparing heterophasic propylene copolymers
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Application No.: US16624191Application Date: 2018-06-14
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Publication No.: US11078304B2Publication Date: 2021-08-03
- Inventor: Luigi Maria Cristoforo Resconi , Wilfried Toltsch , Ville Virkkunen , Ismo Lehtiniemi , Noureddine Ajellal
- Applicant: BOREALIS AG
- Applicant Address: AU Vienna
- Assignee: BOREALIS AG
- Current Assignee: BOREALIS AG
- Current Assignee Address: AU Vienna
- Agency: Tarolli, Sundheim, Covell & Tummino LLP
- Priority: EP17180164 20170707
- International Application: PCT/EP2018/065740 WO 20180614
- International Announcement: WO2019/007655 WO 20190110
- Main IPC: C08F4/64
- IPC: C08F4/64 ; C08F4/76 ; C08L23/16 ; C08F4/6592 ; C08F2/01 ; C08F2/34 ; C08F4/659 ; C08F210/06
Abstract:
Process for producing a heterophasic propylene copolymer using a specific class of metallocene complexes in a multistage polymerization process including a gas phase polymerization step. The invention further relates to the use of catalysts which comprise a specific class of metallocene complexes to produce a heterophasic propylene copolymer in a multistep process including a gas phase polymerization step.
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