Multilayered material sheet and process for its preparation

F - Mech Eng,Light,Heat,Weapons – 41 – H

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F41H 5/04 (2006.01)

Patent

CA 2650447

The invention relates to a multilayered material sheet comprising a consolidated stack of unidirectional monolayers of drawn ultra high molecular weight polyolefine. The draw direction of two subsequent monolayers in the stack differs. Moreover the thickness of at least one monolayer does not exceed 50 µm, and the strength of at least one monolayer is comprised between 1.2 GPa and 3 GPa. The invention also relates to a ballistic resistant article comprising the multilayered material sheet and to a process for the preparation of the ballistic resistant article.

L'invention porte sur une feuille de matériau multicouche comprenant une pile consolidée de monocouches unidirectionnelles d'une polyoléfine étirée à poids moléculaire ultra élevé. Le sens d'étirement des deux couches suivantes de la pile diffère. De plus, l'épaisseur d'au moins une monocouche n'excède pas 50 µm, et la résistance d'au moins une monocouche est comprise entre 1,2 GPa and 3 GPa. L'invention porte également sur un article résistant aux balles comprenant la feuille de matériau multicouche et sur son procédé de préparation.

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