Avient Protective Materials B.v.

Dsm Protective Materials B.v.

Matthew Craig

James Rogers

Johann Van Elburg

The present invention provides a process for producing a ballistic-resistant curved molded article said process comprising pressing in a mold a stack comprising a plurality of layers of unidirectionally aligned polyolefin fibers substantially absent a bonding matrix and a plurality of layers of adhesive; characterized in that a means for dispersing pressure is employed against at least one surface of the stack. Also provided are a ballistic-resistant curved molded article and a press-pad having substantially the shape of a curved mold.

Ballistic-resistant curved molded article

The present invention provides process for producing a ballistic-resistant molded article, which molded article comprises: i) a plurality of layers of unidirectionally aligned polyolefin fibers, which layers are substantially absent a bonding matrix; and ii) a plurality of layers of adhesive, and which process comprises: a) providing a plurality of precursor sheets, each of said precursor sheets comprising i) at least one layer of unidirectionally aligned polyolefin fibers which layer is substantially absent a bonding matrix, and ii) at least one layer of adhesive; b) stacking said precursor sheets to form a stack, wherein the total amount of adhesive in the stack is from 5.0 to 12.0 wt. % based on the total weight of the stack; c) pressing the stack produced in step b) at a temperature of from 1 to 30&#xb0; C. below the melting point of the polyolefin fibers and at a pressure of at least 8 MPa; and d) cooling the pressed stack produced in step c) to at least 50&#xb0; C. below the melting point of the polyolefin fibers while maintaining pressure.

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Stanley, NC, United States of America

Matthew Craig