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:
Dec. 13, 2011
Filed:
Sep. 02, 2008
Choon Sik Shim, Daejeon, KR;
Hyeong Taek Ham, Daejeon, KR;
Sung Seok Chae, Daejeon, KR;
Dae Ho Shin, Daejeon, KR;
Seung Bum Kwon, Daejeon, KR;
Jong Sok Hahn, Daejeon, KR;
Myung Ahn OK, Daejeon, KR;
Choon Sik Shim, Daejeon, KR;
Hyeong Taek Ham, Daejeon, KR;
Sung Seok Chae, Daejeon, KR;
Dae Ho Shin, Daejeon, KR;
Seung Bum Kwon, Daejeon, KR;
Jong Sok Hahn, Daejeon, KR;
Myung Ahn Ok, Daejeon, KR;
SK Energy Co., Ltd., Seoul, KR;
Abstract
Disclosed are an ethylene polymerization process, a catalyst for use in the process, a production method employing the catalyst, and a product produced thereby. More specifically, disclosed is a process of producing an ethylene copolymer from ethylene and an alpha-olefin comonomer, in which the produced ethylene copolymer has a multimodal molecular weight distribution and excellent processability and physical properties, and thus can increase the value and productivity of products, including pipes and films. Particularly, the produced ethylene copolymer has a trimodal or higher molecular weight distribution or density distribution, and thus, when it is a linear low-density copolymer, it has an excellent effect of improving the impact strength of films, and when it is a medium-density ethylene copolymer, it can be produced into pipes, which have slow crack growth rate and can be used even at high temperature.