Antiballistic shaped part

• US 6,238,768 B1
• Filed: 12/23/1998
• Issued: 05/29/2001
• Est. Priority Date: 06/24/1996
• Status: Expired due to Term

• Current Assignee: DSM IP Assets BV (DSM-Firmenich AG)
• Original Assignee: DSM B.V.
• Inventors: Van de Goot, Ernst L.
• Primary Examiner(s): DIXON, MERRICK L
• Application Number:
  US09/219,360
• Time in Patent Office: 888 Days
• Field of Search: 428/156, 428/284, 428/195, 428/170, 428/171, 428/172, 428/232, 428/294.7, 428/295, 428/911, 428/113, 428/295.4, 428/295.1, 428/221
• US Class Current: 428/113
• CPC Class Codes: B32B 2262/0269 Aromatic polyamide fibres
• CPC Class Codes: B32B 2571/02 defensive, e.g. armour plates, anti-ballistic clothing camouflage nets B32B2459/00
• CPC Class Codes: B32B 5/12 characterised by the relative arrangement of fibres or filaments of different layers, e.g. the fibres or filaments being parallel or perpendicular to each other
• CPC Class Codes: B32B 5/26 another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: B32B 7/04 Interconnection of layers
• CPC Class Codes: F41H 5/0485 all the layers being only fibre- or fabric-reinforced layers
• CPC Class Codes: Y10T 428/24124 Fibers
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/24595 and varying density
• CPC Class Codes: Y10T 428/24603 Fiber containing component
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/249921 Web or sheet containing structurally defined element or component
• CPC Class Codes: Y10T 428/249933 Fiber embedded in or on the surface of a natural or synthetic rubber matrix

Abstract

The invention relates to an antiballistic shaped part composed of a stack of composite layers which layers are not linked to one another. Each composite layer having two or more monolayers of unidirectionally oriented fibers in a matrix. The fibers in each monolayer being at an angle to the fibers in an adjoining monolayer, and composed of poly(p-phenylenebenzobisoxazole. The composite layer containing at most 10% by weight of an elastomeric matrix material (calculated on the basis of the total weight of the composite layer), and having an areal density of at most 500 g/m². The fiber content in each monolayer being between 10 and 200 g/m². The invention also relates to method for fabricating said shaped part and body armour in which the shaped part is used.

Claims

1. Antiballistic shaped part comprising a stack of composite layers which are not linked to one another, each composite layer comprising two or more monolayers of unidirectionally oriented fibres in a matrix, the fibres in each monolayer being at an angle to the fibres in an adjoining monolayer, wherein the fibres are aramid fibres or poly(p-phenylenebenzobisoxazole) fibres, the composite layer contains at most 10% by weight of an elastomeric matrix material calculated on the basis of the total weight of the composite layer, the composite layer has an areal density of at most 500 g/m², and the fibre content in each monolayer is between 10 and 200 g/m².

2. Antiballistic shaped part according to claim 1, wherein the composite layer contains at most 7% by weight of the elastomeric matrix material.

3. Antiballistic shaped part according to claim 1, wherein the composite layer contains at most 5% by weight of the elastomeric matrix material.

4. Antiballistic shaped part according to any of claims 1-3, wherein the matrix in addition to the elastomeric matrix material also contains a filler in an amount of from 5 to 80% by volume, calculated on the basis of the total volume of the elastomeric matrix material and the filler.

5. Antiballistic shaped part according to claim 4, wherein the matrix contains from 20 to 80% by volume of filler.

6. Antiballistic shaped part according to claim 5, wherein the elastomeric matrix material is a thermoplastic elastomer having a modulus in tension at 25°

C. of less than 40 MPa.

7. Antiballistic shaped part according to claim 5, wherein the elastomeric matrix material is a styrene-isoprene-styrene block copolymer.

8. Antiballistic shaped part according to claim 5, wherein disposed on one or both sides of each composite layer there is a separating layer.

9. Body armour comprising an antiballistic shaped part according to claim 5, wherein the composite layer has a total weight of at most 500 g/m², and the fibre content in each monolayer is between 10 and 150 g/m².

10. Body armour according to claim 9, wherein the composite layer has a total weight of at most 300 g/m², and the fibre content in each monolayer is between 10 and 100 g/m².

11. Method for fabricating an antiballistic shaped part according to claim 1, wherein the monolayer is produced by aramid yarns having a count of yarn between 800 and 2500 denier being wetted with a dispersion of the elastomeric matrix material and the filler which may be present.

12. Method according to claim 11, wherein the dispersion contains between 30 and 60% by weight of elastomeric matrix material and any filler which may be present based on the total weight dispersion.

13. Antiballistic shaped part obtainable in accordance with the method of claim 11 or 12.

14. Antiballistic shaped part according to claim 5 wherein the shaped part has a specific energy absorption of at least 190 Jm²/kg when struck by 9 mm full metal jacket 8 gram bullet.