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AssigneeAvient Protective Materials B.V.
InventorsJohann VAN ELBURG, Harm VAN DER WERFF, Reinard Jozef Maria STEEMAN, Brad Alan DICKINSON, Ulrich HEISSERER
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The present invention relates to a ballistic-resistant molded article comprising a consolidated stack comprising between 50 wt % and 95 wt % monolayers A and 5 wt % and at most 50 wt % monolayers B, the consolidated stack having an areal density of at least 7.0 and at most 15.0 kg/m2, whereby the direction of orientation of two adjacent monolayers in the stack differs by at least 40 and up to 90 degree, wherein the monolayers A have an areal density of between 28 and 80 g/m2 of the oriented polymer A and the monolayers B having an areal density of between 4 and 28 g/m2 of the oriented polymer B, wherein the areal density of the oriented polymer A in the monolayers A is at least 5 g/m2 higher than the areal density of the oriented polymer B in the monolayers B. The invention also relates to a hybrid ballistic-resistant molded article with a V50 when shot at an angle of 30° from perpendicular better than the V50 expected based on the individual V50 of the employed components. The invention further relates to a high performance ballistic-resistant sheet enabling the hybrid ballistic-resistant molded article.
A ballistic-resistant molded article comprising a consolidated stack comprising between 50 wt % and 95 wt % monolayers A and 5 wt % and at most 50 wt % monolayers B based on the total weight of monolayers A and monolayers B, the consolidated stack having an areal density (AD) of at least 7.0 and at most 15.0 kg/m2, the monolayers A and the monolayers B comprising oriented polymer A and oriented polymer B respectively, whereby the direction of orientation of the oriented polymers of two adjacent monolayers in the stack differs by at least 40 and up to 90 degree, wherein the monolayers A have an areal density of between 28 and 80 g/m2 of the oriented polymer A and the monolayers B having an areal density of between 4 and 28 g/m2 of the oriented polymer B, wherein the areal density of the oriented polymer A in the monolayers A is at least 5 g/m2 higher than the areal density of the oriented polymer B in the monolayers B.
A ballistic-resistant molded article comprising a consolidated stack comprising between 50 wt % and 95 wt % monolayers A and 5 wt % and at most 50 wt % monolayers B based on the total weight of monolayers A and monolayers B, the consolidated stack having an areal density (AD) of at least 7.0 and at most 15.0 kg/m2, the monolayers A and the monolayers B comprising oriented polymer A and oriented polymer B respectively, whereby the direction of orientation of the oriented polymers of two adjacent monolayers in the stack differs by at least 40 and up to 90 degree, wherein the ballistic resistant molded article has a V50 when shot at an angle (26) of 30° from perpendicular (V50) according to formula (1)
A ballistic-resistant sheet comprising at least 2 fibrous layers, each fibrous layer containing unidirectionally aligned filaments of oriented polyethylene, whereby the direction of orientation between the polyethylene filaments of two adjacent fibrous layers in the sheet differ by at least 40 and up to 90 degree, the polyethylene filaments having a tenacity of at least 3.5 N/tex, wherein the ballistic-resistant sheet comprises between 5.0 and 20 wt % of a binder based on the weight of the filaments of oriented polyethylene, wherein the fibrous layer of unidirectionally aligned filaments of oriented polyethylene are substantially free of binder and wherein adjacent fibrous layers are separated by the binder, wherein the fibrous layers of the ballistic-resistant sheet have each an areal density of between 4 and 28 g/m2 per layer of unidirectionally aligned filaments of oriented polyethylene, preferably between 6 and 26 g/m2, more preferably between 8 and 25 g/m2 and most preferably between 10 and 24 g/m2.
Dependencies are inferred from the claim text.