Japan Polyolefins Co., Ltd.

Reiji Higuchi

Tatsuo Yamaguchi

Masaaki Ikeda

Fumio Asada

Kenichi Hiraki

Yoshimi Shimizu

Kazuyuki Sakamoto

Sinji Miwa

Masahiro Wakayama

Toshiaki Egashira

Kimiya Miyoshi

The present invention relates to an ethylene-&agr;-olefin copolymer; a composition thereof; a film thereof; a polar group-containing resin material; and productions and use of the ethylene-&agr;-olefin copolymer. The ethylene-&agr;-olefin copolymer of the present invention is characterized in satisfying the following conditions (A) to (E): (A) a density in the range of 0.92 to 0.96 g/cm ; (B) a melt flow rate (MFR) in the range of 0.01 to 200 g/10 min; (C) a molecular weight distribution (Mw/Mn) in the range of 1.5 to 5.0; (D) possessing only one peak in terms of the number of peaks observed in an elution temperature-eluted amount curve as measured by the continuous temperature raising elution fractionation (TREF) method, from the integrated elution curve obtained by the elution temperature-eluted amount curve, the difference T &minus;T in the temperature and density d respectively satisfy a specific relationship, wherein T is the temperature where 25% of the total elution is obtained, and T is the temperature where 75% of the total elution is obtained; and (E) possessing one or two melting point peaks, and among these the highest melting point T and the density d satisfy a specific relationship. Accordingly, this ethylene-&agr;-olefin copolymer exhibits a superior thermal resistance, heat sealability, and processability.

Ethylene/&agr;-olefin copolymer

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Kawasaki, Japan

Reiji Higuchi