Ballistic resistant articles comprising tapes

Patent metadata

Field	Value
Publication number	US-10408575-B2
Application number	US-201515113869-A
Country	US
Kind code	B2
Filing date	Feb 5, 2015
Priority date	Feb 10, 2014
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A ballistic-resistant molded article includes a compressed stack of sheets made up of reinforcing tapes having a tensile strength of at least 1.0 GPa, a tensile modulus of at least 40 GPa, and a tensile energy-to-break of at least 15 J/g, the direction of the tapes within the compressed stack being not unidirectional. The stack includes a first layer of sheets including reinforcing tapes and a high-density polyethylene (HDPE) as matrix material and a further layer of sheets including reinforcing tapes and a thermoplastic elastomer as matrix material, wherein the further layer includes 0.2-8 wt. % matrix material.

First claim

The invention claimed is:

1. A ballistic-resistant molded article comprising:
a compressed stack of a plurality of sheets comprising reinforcing tapes having a tensile strength of at least 1.0 GPa, a tensile modulus of at least 40 GPa, and a tensile energy- to-break of at least 15 J/g, the reinforcing tapes having an orientation direction within the compressed stack that is not unidirectional, wherein the stack comprises:
at least one HDPE-based layer comprising:
a high-density polyethylene as a matrix material and at least one of the plurality of sheets comprising the reinforcing tapes,
wherein the matrix is at least 60 wt. % HDPE, and

at least one elastomer-based layer comprising:
a thermoplastic elastomer as a matrix material and another one of the plurality of sheets comprising the reinforcing tapes,
wherein the thermoplastic elastomer matrix material of the at least one elastomer-based layer makes up 0.2-8 wt. % of the at least one elastomer-based layer, and
the matrix is at least 60 wt. % elastomer.

2. The ballistic-resistant molded article according to claim 1 , wherein the high-density polyethylene matrix material of the at least one HDPE-based layer makes up between 0.2 and 20 wt. % of the at least one HDPE-based layer.

3. The ballistic-resistant molded article according to claim 1 , wherein the high-density polyethylene matrix material has a density, measured in accordance with ASTM D792, in a range of 0.930 to 0.970 g/cm 3 .

4. The ballistic-resistant molded article according to claim 1 , wherein the high-density polyethylene matrix material of the at least one HDPE-based layer has a molecular weight in a range of1·10 4 to 1·10 8 g/mol.

5. The ballistic-resistant molded article according to claim 1 , wherein the at least one HDPE-based layer is at or near a back face of the article, wherein the back face is opposite a strike face of the article from which an impact is expected.

6. The ballistic-resistant molded article according to claim 1 , wherein the at least one HDPE-based layer is at or near a strike face of the article from which an impact is expected.

7. The ballistic-resistant molded article according to claim 1 , comprising more than one of the at least one HDPE-based layer, wherein at least one of the more than one HDPE-based layers is at or near a strike face of the article, and at least one other one of the more than one HDPE-based layers is at or near a back face of the article, wherein the back face is the face opposite the strike face of the article from which an impact is expected.

8. The ballistic-resistant molded article according to claim 1 , wherein 2-70 wt. % of the article is made up of the at least one HDPE-based layer, calculated on a total weight of the high-density polyethylene matrix material, the thermoplastic elastomer matrix material and the reinforcing tapes in the article.

9. The ballistic-resistant molded article according to claim 1 , wherein the reinforcing tapes of the compressed stack are ultra-high molecular weight polyethylene tapes.

10. The ballistic-resistant molded article according to claim 1 , which is substantially flat, single-curved, double curved, or multicurved.

11. The ballistic-resistant molded article according to claim 10 , which is a panel, shield or helmet.

Assignees

• Teijin Aramid Bv

Inventors

• Van Der Eem Joris
• Harings Jules
• Janse Gerardus
• Tjaden Hendrik

Classifications

• F41H5/0485

  all the layers being only fibre- or fabric-reinforced layers · CPC title

• F41H5/0471 Primary

  Layered armour containing fibre- or fabric-reinforced layers (in combination with ceramic layers F41H5/0428, with metal layers F41H5/0457) · CPC title

• F41H5/0478 Primary

  Fibre- or fabric-reinforced layers in combination with plastics layers · CPC title

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title

• B32B2323/043

  HDPE, i.e. high density polyethylene · CPC title