| abstract |
There are disclosed an ethylenic copolymer having a melt index (MI) of 0.1 to 30 g/10mm, a density of 0.880 to 0.940g/ml, a molecular weight distribution as defined by the weight-average molecular weight (Mw)/number-average molecular weight (Mn) ratio of 2 to 6, width of dependence of number of branches on molecular weight of 0 to 5/1000, orthodichlorobenzene (ODCB) soluble portion of 10% or less by weight, and maximum melting point (Tm(max)) as measured with a differential scanning calorimeter (DSC) of 120° or less; and a composition comprising as principal components, (a) the above ethylenic copolymer and (b) an ethylen/α-olefin copolymer having a specific range for each of MI, density, number of branches and Tm(max). The above-disclosed ethylenic copolymer is minimized in the contents of low and high branching components in spite of its having a wide distribution of molecular weight and is well balanced among the excellent properties in moldability, transparency and heat sealability. Consequently, it can be effectively utilized for films, packing materials, heat insulating materials and foaming materials. n Also, the above-disclosed composition is surprisingly balanced among transparency, heat sealing temperature, tear strength, etc. and is extremely useful in a variety of fields, especially packaging field. |