| 摘要 |
Provided are a single-layer shape retaining material that has a high shape retainability in an arbitrary direction and excellent mechanical strength properties such as tensile elasticity and tensile strength, and a method for manufacturing the shape retaining material. The shape retaining material is a fiber-type, band-type or sheet-type stretched molding that comprises 100 parts by weight of a high-density polyethylene resin having a weight-average molecular weight of 100,000-500,000 and a density of 0.945-0.960 g/cm3 and 3-50 parts by weight of an ethylene-α-olefin copolymer, said ethylene-α-olefin copolymer being obtained by copolymerizing ethylene with an α-olefin carrying 4-10 carbon atoms, having a density of 0.935-0.960 g/cm3 and showing a difference in density from the high-density polyethylene resin of ± 0.020 g/cm3 or less, characterized in that, when the shape retaining material is bent at 180degrees in the direction perpendicular to the machine direction, held for 1 minute and then released, the bend return angle measured 5 minutes after the release is 15 degrees or less, and the bend return angle in the direction parallel to the machine direction is 25 degrees or less. |
