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Abstract

The present invention relates to an ethylene-.alpha.-olefin copolymer; a composition thereof; a film thereof; a polar group-containing resin material; and productions and use of the ethylene-.alpha.-olefin copolymer. The ethylene-.alpha.-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.sup.3 ; (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.sub.75 -T.sub.25 in the temperature and density d respectively satisfy a specific relationship, wherein T.sub.25 is the temperature where 25% of the total elution is obtained, and T.sub.75 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.sub.m1 and the density d satisfy a specific relationship. Accordingly, this ethylene-.alpha.-olefin copolymer exhibits a superior thermal resistance, heat sealability, and processability.

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First Claim