Composite catalyst for production of polyethylene

US8536286B2 · kind B2 · utility

Assignees

• CHINA PETROLEUM & CHEMICAL CORPORATION · CN
• ZHEJIANG UNIVERSITY · CN
• SINOPEC ENGINEERING INCORPORATION · CN

Inventors

• Wenqing Wu · San Diego, US
• Yongrong Yang · Zhejiang, CN
• Jingdai Wang · Zhejiang, CN
• Binbo Jiang · Zhejiang, CN
• Guanghai Luo · Beijing, CN
• Shufang Wang · Foshan, CN
• Yi-Feng Wang · Beijing, CN
• Xianfong Zhang · Tianjin, CN
• Guodong Han · Tianjin, CN

Key dates

• Filing date: Mar 28, 2008
• Grant date: Sep 17, 2013
• Expiry date: Aug 11, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/582
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A composite catalyst useful in the production of polyethylene, which comprises at least a first catalyst and a second catalyst separated by a polymer layer, with the first catalyst and the second catalyst being identical or different, is described. A composite catalyst useful in the production of polyethylene with a broad molecular weight distribution in a single polymerization reactor, which comprises at least a first catalyst and a second catalyst separated by a polymer layer, with the first catalyst and the second catalyst being different, is also described. A process for preparing said catalysts and a process for the production of a polyethylene by using said catalysts are also described.