Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Reexamination Certificate
2008-09-02
2011-12-13
Lu, Caixia (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
C526S113000, C526S134000, C526S160000, C526S165000, C526S352000, C526S943000, C524S240000
Reexamination Certificate
active
08076428
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.
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Tetsuya Yoshikiyo and Takaaki Hattori, Japan Polyethylene Corp., High performance PE100 Resin with extraordinary resistance to Slow Crack Growth, Plastics Pipes XIII, 2006.
Chae Sung Seok
Hahn Jong Sok
Ham Hyeong Taek
Kwon Seung Bum
Ok Myung Ahn
Abelman ,Frayne & Schwab
Lu Caixia
SK Energy Co., Ltd.
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