Shape retaining material and method for producing the same
AssigneeSekisui Seikei, Ltd.
InventorsAtsuhito Tadokoro, Shinichi Tokudome, Tomoyuki Hishida
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Abstract
The present invention provides a single-layer shape retaining material which is a fibrous, band-like, or sheet-like stretched formed material comprising 100 parts by weight of a high-density polyethylene resin having a weight-average molecular weight of 100,000 to 500,000 and a density of 0.945 to 0.960 g/cm3 and 3 to 50 parts by weight of an ethylene-α-olefin copolymer obtained by copolymerizing ethylene with an α-olefin having 4 to 10 carbon atoms, the copolymer having a density of 0.935 to 0.960 g/cm3, the difference in density between the copolymer and the high-density polyethylene resin being ±0.020 g/cm3 or less and a method for producing same.
Claims9
A shape retaining material, which is a fibrous, band-like, or sheet-like stretched formed material comprising 100 parts by weight of a high-density polyethylene resin having a weight-average molecular weight of 100,000 to 500,000 Daltons and a density of 0.945 to 0.960 g/cm3 and 3 to 50 parts by weight of an ethylene-α-olefin copolymer obtained by copolymerizing ethylene with an α-olefin having 4 to 10 carbon atoms, the copolymer having a density of 0.935 to 0.960 g/cm3, the difference in density between the copolymer and the high-density polyethylene resin being ±0.020 g/cm3 or less, wherein the material shows, after being bent at an angle of 180 degrees in TD, held in the bent state for 1 minute, released, and left for 5 minutes after the release, a return angle of 15 degrees or less;
- and shows, after being bent at an angle of 180 degrees in MD, held in the bent state for 1 minute, released, and left for 5 minutes after the release, a return angle of 25 degrees or less.
A method for producing the shape retaining material wherein the material shows, after being bent at an angle of 180 degrees in TD, held in the bent state for 1 minute, released, and left for 5 minutes after the release, a return angle of 15 degrees or less;
- and shows, after being bent at an angle of 180 degrees in MD, held in the bent state for 1 minute, released, and left for 5 minutes after the release, a return angle of 25 degrees or less, comprising rolling, at a rolling ratio of 5 times or more, a linear, band-like, or sheet-like formed material comprising 100 parts by weight of a high-density polyethylene resin having a weight-average molecular weight of 100,000 to 500,000 Daltons and a density of 0.945 to 0.960 g/cm3 and 3 to 50 parts by weight of an ethylene-α-olefin copolymer obtained by copolymerizing ethylene with an α-olefin having 4 to 10 carbon atoms, the copolymer having a density of 0.935 to 0.960 g/cm3, the difference in density between the copolymer and the high-density polyethylene resin being ±0.020 g/cm3 or less.
A method for producing the shape retaining material wherein the material shows, after being bent at an angle of 180 degrees in TD, held in the bent state for 1 minute, released, and left for 5 minutes after the release, a return angle of 15 degrees or less;
- and shows, after being bent at an angle of 180 degrees in MD, held in the bent state for 1 minute, released, and left for 5 minutes after the release, a return angle of 25 degrees or less, comprising rolling the linear, band-like, or sheet-like formed material comprising 100 parts by weight of a high-density polyethylene resin having a weight-average molecular weight of 100,000 to 500,000 Daltons and a density of 0.945 to 0.960 g/cm3 and 3 to 50 parts by weight of an ethylene-α-olefin copolymer obtained by copolymerizing ethylene with an α-olefin having 4 to 10 carbon atoms, the copolymer having a density of 0.935 to 0.960 g/cm3, the difference in density between the copolymer and the high-density polyethylene resin being ±0.020 g/cm3 or less, and subsequently uniaxially stretching the rolled material at a total stretching ratio of 10 to 40 times.
Dependencies are inferred from the claim text.