| 摘要 |
<p>PURPOSE:To enhance tansparency and blocking resistance, by a method wherein a propylene-ethylene copolymer having a specified ethylene content, a specified blocking index, a specified MFI and a specific MLMFI/MFI ratio is melt-extruded, and is biaxially stretched. CONSTITUTION:A propylene-ethylene random copolymer resin having an ethylene content measured by the C<13>-NMR method of 8-14mol%, a blocking index measured by the C<13>-NMR method of not higher than 1.1, an MFI (230 deg.C, load 2.16kg) of 0.5-15g/min and a ratio of MLMFI (230 deg.C, load 10.0kg) to MFI (230 deg.C, load 2.16kg) of 1:10-16 is produced. The resin is melt-extruded into a tubular form at 200-280 deg.C, followed by cooling to a temperature of 10-30 deg.C. The thus obtained tubular film is biaxially and simultaneously stretched at a temperature of 120-140 deg.C to obtain the propylene base resin film for shrink wrapping.</p> |
