Thermoplastic resin sheet and container
AssigneeSumitomo Chemical Company, Limited
InventorsSatoshi Hanada, Mitsunori Nodono, Ryuma Kuroda
Life of this patent
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Abstract
The present invention provides a thermoplastic resin sheet having a thermoplastic resin expanded layer of which expansion ratio is in the range of 3 to 40 times, and cell wall density ratio is in the range of 2 to 20, said thermoplastic resin sheet having excellent thermal insulation property, and a container being formed from the thermoplastic resin sheet.
Claims11
A thermoplastic resin sheet having a thermoplastic resin expanded layer of which expansion ratio is in a range of 3 to 40 times, and a cell wall density ratio is in a range of 2 to 20, wherein the cell wall density ratio is defined as being T/S wherein T denotes a cell wall density in the direction of thickness of the expanded layer and S denotes a minimum value of the cell wall density in the direction perpendicular to the direction of thickness of the expanded layer, wherein a cell wall density is defined as being the average number of cell walls existing within a distance of 1 mm in the expanded layer, and wherein the average cell diameter is in the range of 1 μm to 10 μm.
A thermoplastic resin sheet having a thermoplastic resin expanded layer of which expansion ratio is in a range of 3 to 40 times, and cell wall density ratio is in a range of 6 to 20, wherein the cell wall density ratio is defined as being T/S wherein T denotes a cell wall density in the direction of thickness of the expanded layer and S denotes a minimum value of the cell wall density in the direction perpendicular to the direction of thickness of the expanded layer, wherein a cell wall density is defined as being the average number of cell walls existing within a distance of 1 mm in the expanded layer, and wherein the average cell diameter is in the range of 1μm to 100μm.
A thermoplastic resin sheet having a thermoplastic resin expanded layer of which expansion ratio is in the range of 3 to 40 times, cell wall density across a thickness direction of said thermoplastic sheet is 8 cells/mm or more, and cell wall density ratio is in a range of 6 to 20, wherein the cell wall density ratio is defined as being T/S wherein T denotes a cell wall density in the direction of thickness of the expanded layer and S denotes a minimum value of the cell wall density in the direction perpendicular to the direction of thickness of the expanded layer, wherein a cell wall density is defined as being the average number of cell walls existing within a distance of 1 mm in the expanded layer, and wherein the average cell diameter is in the range of 1μm to 100μm.
A thermoplastic resin sheet having a thermoplastic resin expanded layer of which expansion ratio is in the range of 3 to 40 times, cell wall density across a thickness direction of said thermoplastic sheet is 8 cells/mm or more, and cell wall density ratio is not less than 2 but less than 6, wherein the cell wall density ratio is defined as being T/S wherein T denotes a cell wall density in the direction of thickness of the expanded layer and S denotes a minimum value of the cell wall density in the direction perpendicular to the direction of thickness of the expanded layer, wherein a cell wall density is defined as being the average number of cell walls existing within a distance of 1 mm in the expanded layer, and wherein the average cell diameter is in the range of 1μm to 100μm.
Dependencies are inferred from the claim text.