| 摘要 |
A process for producing heat-shrinkable polyethylene film having less thickness variation in a mottled pattern, excellent low-temperature heat-shrinking properties and excellent transparency, which comprises conducting tubular stretching under specific stretching temperature conditions of a resin composition mainly comprising a copolymer composed of ethylene and 1 to 10 % of at least one C4-C12 alpha -olefin and having a melting point of 0.3 to 2.0 g/10 min and a density of 0.86 to 0.92 g/cm<3> at 25 DEG C, more preferably a composition having an endothermic area below the melting point of 55 % or more based on the whole endothermic area in the melting curve obtained by using a differential scanning calorimeter. No excellent properties could be obtained by conventional linear low-density polyethylene having a g< eta > (=[n]/[n]L; wherein [n] is a limiting viscosity of a polymer and [n]L is a limiting viscosity of a straight chain polymer of the same average molecular weight as that of the said polymer) of 0.3 to 0.7 which showed good transparency but which, in tubular bi-axial stretching, showed unstable stretchability, providing stretched film with large thickness variation in a mottled pattern. |
