Ethylene-&agr;-olefin copolymer

US6448356B1 · kind B1 · utility

Assignee

• MITSUBISHI CHEMICAL CORPORATION · JP

Inventors

• Yumito Uehara · Kawasaki, JP
• Yoshiyuki Ishihama · Yokkaichi, JP
• Yukitaka Goto · Yokkaichi, JP

Key dates

• Filing date: Aug 20, 2001
• Grant date: Sep 10, 2002
• Expiry date: Aug 20, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/943
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An ethylene-&agr;-olefin copolymer which is a copolymer of ethylene with a C3-20 &agr;-olefin and which satisfies the following conditions (a) to (c):(a) the density (D) is from 0.850 to 0.950 g/cm3,(b) the relation between the melt tension (MT) and the melt flow rate (MFR) at 190° C. satisfies the following formula (1):log(MT)≧−0.91×log(MFR)+0.06   (1), and(c) the following three formulae (2), (3) and (4) are satisfied:Tmax≦972D−813   (2) logW60≦−0.114 Tmax+9.48   (3) logW90≧0.0394 Tmax−2.95   (4) where D is the density, Tmax is the elution peak temperature (°C.) by the cross fractionation measurement, W60 is the weight percentage (wt %) of a soluble content at 60° C. or lower, and W90 is the weight percentage (wt %) of a soluble content at 90° C. or higher.