ETHYLENE/ALPHA-OLEFIN COPOLYMER, COMPOSITION THEREOF, FILM THEREOF, AND USES OF THESE

摘要

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<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 T75 - T25 in the temperature and density d respectively satisfy a specific relationship, wherein T25 is the temperature where 25% of the total elution is obtained, and T75 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 Tm1 and the density d satisfy a specific relationship. Accordingly, this ethylene- alpha -olefin copolymer exhibits a superior thermal resistance, heat sealability, and processability.