| 摘要 |
PURPOSE:A random propylene/4C or higher alpha-olefin copolymer excellent in physical and mechanical properties and free of surface stickiness, having a specified composition and properties (alpha-olefin content and solvent-extractable component content). CONSTITUTION:A random copolymer having the following properties: (i) the content of 4C or higher alpha-olefins (preferably, butene-1 and hexene-1): 3-25mol%, (ii) intrinsic viscosity [eta]: 0.8-10dl/g, (iii) boiling n-heptane-insoluble portion: 7wt% or above, (iv) boiling ether-soluble portion: 2-20wt%, (v) rate of the area of signals of chemical shifts in the range of 19-21.1 to that of signals attributable to side chain methyl groups (as measured on the boiling ether-insoluble portion by <13>C-NMR): 3-30%, and (vi) rate of the above area to that on the boiling ether-soluble portion: 25-70%. By using this copolymer, it is possible to produce a film excellent in low-temperature heat-sealing property, transparency, and blocking resistance.
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