Mitsui Chemicals, Inc.

Nobuo Murase

Satoshi Ikeda

Junichi Mohri

Masahiro Enna

Akihiro Matsuda

A copolymer containing a constituent unit derived from ethylene and a constituent unit derived from an &#x3b1;-olefin having 3 to 20 carbon atoms and satisfying the following requirements (1) to (5): (1) the copolymer has a melting point (Tm) of &#x2212;20&#xb0; C. to 100&#xb0; C.; (2) the melting point (Tm) and the density D (g/cm) satisfy the following expression Tm&#x2267;1073&#xd7;D&#x2212;893 (1); (3) the copolymer has a molecular weight distribution (Mw/Mn) measured by GPC of 1.6 to 5.0; (4) the copolymer has a half-width (&#x394;Thalf) of a melting peak measured by DSC of 90&#xb0; C. or less; and (5) the half-width (&#x394;Thalf) and the melting point (Tm) satisfy the relationship shown by the following expression&#x394;Thalf&#x2266;&#x2212;0.71&#xd7;Tm+101.4&#x2003;&#x2003;(2).

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Ichihara, Japan

Nobuo Murase