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US 2007/0163023 A1Published application
Ballistic-resistant article
AssigneeDsm IP Assets B.V.
InventorsReinard Steeman, Martinus Jacobs
Life of this patent
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AssigneeDsm IP Assets B.V.
InventorsReinard Steeman, Martinus Jacobs
Estimating the term…
The invention relates to a preformed sheet comprising at least two mono-layers, each mono-layer containing unidirectionally oriented fibers having a tensile strength of at least about 1.2 GPa and a tensile modulus of at least 40 GPa, and a binder, with a fibre direction in each mono-layer being rotated with respect to the fibre direction in an adjacent mono-layer, and a separating film on both outer surfaces, characterized in that the separating film has a porosity of between 40 and 90%. With this preformed sheet assemblies and articles offering a substantially higher ballistic protection level at a certain weight can be obtained. The invention further relates to an assembly of at least two such sheets and to a flexible ballistic-resistant article comprising said assembly.
Preformed sheet comprising at least two mono-layers, each mono-layer containing unidirectionally oriented fibers having a tensile strength of at least about 1.2 GPa and a tensile modulus of at least 40 GPa, and a binder, with a fibre direction in each mono-layer being rotated with respect to the fibre direction in an adjacent mono-layer, and a separating film on both outer surfaces, characterized in that the separating film has a porosity of between 40 and 90%.
Flexible ballistic-resistant article comprising an assembly, which contains a plurality of sheets containing at least two mono-layers, each mono-layer consisting essentially of unidirectionally oriented high-performance polyethylene fibres having a tensile strength of at least 1.2 GPa, with the fibre direction in each mono-layer being rotated with respect to the fibre direction in an adjacent mono-layer, and two polyethylene separating films having a porosity of between 40 and 90% on both outer surfaces, the assembly having an areal density of at least 1.5 kg/m2 and a specific energy absorption of at least 300 J.m2/kg as measured against a 9×19 mm FMJ Parabellum bullet according to a test procedure based on Stanag 2920.
Dependencies are inferred from the claim text.