Patent ID: 8557079

Claim:
A method for preparing a ballistic resistant article, which comprises: (a) aligning a plurality of unidirectional ultrahigh-molecular-weight polyethylene flat film strips such that each strip is oriented in parallel to adjacent strips such that adjacent strips contact each other but do not overlap along an edge region thereof, said plurality of strips being laid over a first unidirectional ultrahigh-molecular-weight polyethylene monolayer, with the direction of said plurality of strips being rotated with respect to the direction of said first unidirectional ultrahigh-molecular-weight polyethylene monolayer at an angle; and (b) compressing said plurality of unidirectional ultrahigh-molecular-weight polyethylene flat film strips laid over said unidirectional ultrahigh-molecular-weight polyethylene monolayer, thereby obtaining a bilayered material consisting essentially of ultrahigh-molecular-weight polyethylene and essentially devoid of bonding matrices, comprising two compressed unidirectional monolayers with the direction of each monolayer being rotated at an angle with respect to the direction in an adjacent unidirectional monolayer, with the bilayered material being essentially devoid of resins or adhesives.