Jul 7, 2026

US12674649 - Ballistic-resistant molded article

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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° 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° C. below the melting point of the polyolefin fibers while maintaining pressure.

Assignee: AVIENT PROTECTIVE MATERIALS B.V.
Inventors: Johann Van Elburg, Matthew Craig, James Rogers
Filing date: 2022-10-19

ballisticmaterialprotection

The invention describes a method for creating a ballistic-resistant molded article using layers of unidirectionally aligned polyolefin fibers and adhesive, without a bonding matrix. The process involves stacking precursor sheets, applying pressure and heat, and then cooling the assembly while maintaining pressure to achieve the desired properties.

Claim 1

1 . A ballistic-resistant molded article which comprises: i) a plurality of layers of unidirectionally aligned mechanically fused polyolefin fibers, which layers are substantially absent a bonding matrix or adhesive; and ii) a plurality of layers of adhesive between adjacent layers of the unidirectionally aligned mechanically fused fibers, wherein the ballistic-resistant molded article is obtained by a process comprising: a) providing a plurality of precursor sheets, each of said precursor sheets comprising: i) at least one layer of unidirectionally aligned mechanically fused polyolefin fibers, wherein the at least one layer is substantially absent of a bonding matrix or adhesive, and ii) at least one layer of adhesive; b) stacking the precursor sheets to form a stack, wherein the total amount of the 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° 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° C. below the melting point of the polyolefin fibers while maintaining pressure. i) a plurality of layers of unidirectionally aligned mechanically fused polyolefin fibers, which layers are substantially absent a bonding matrix or adhesive; and ii) a plurality of layers of adhesive between adjacent layers of the unidirectionally aligned mechanically fused fibers, wherein the ballistic-resistant molded article is obtained by a process comprising: a) providing a plurality of precursor sheets, each of said precursor sheets comprising: i) at least one layer of unidirectionally aligned mechanically fused polyolefin fibers, wherein the at least one layer is substantially absent of a bonding matrix or adhesive, and ii) at least one layer of adhesive; i) at least one layer of unidirectionally aligned mechanically fused polyolefin fibers, wherein the at least one layer is substantially absent of a bonding matrix or adhesive, and ii) at least one layer of adhesive; b) stacking the precursor sheets to form a stack, wherein the total amount of the 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° 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° C. below the melting point of the polyolefin fibers while maintaining pressure.

Google Patents

https://patents.google.com/patent/US12674649

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12674649