High-performance polyethylene multifilament yarn

Patent metadata

Field	Value
Publication number	US-2022018040-A1
Application number	US-202117336040-A
Country	US
Kind code	A1
Filing date	Jun 1, 2021
Priority date	Jan 1, 2004
Publication date	Jan 20, 2022
Grant date	—

Abstract

Processes for making high-performance polyethylene multi-filament yarn are disclosed which include the steps of a) making a solution of ultra-high molar mass polyethylene in a solvent; b) spinning of the solution through a spinplate containing at least 5 spinholes into an air-gap to form fluid filaments, while applying a draw ratio DRfluid; c) cooling the fluid filaments to form solvent-containing gel filaments; d) removing at least partly the solvent from the filaments; and e) drawing the filaments in at least one step before, during and/or after said solvent removing, while applying a draw ratio DRsolid of at least 4, wherein in step b) each spinhole comprises a contraction zone of specific dimension and a downstream zone of diameter Dn and length Dn with Ln/Dn of from 0 to at most 25, to result in a draw ratio DRfluid=DRsp*DRag of at least 150, wherein DRsp is the draw ratio in the spinholes and DRag is the draw ratio in the air-gap, with DRsp being greater than 1 and DRag at least 1. High-performance polyethylene multifilament yarn, and semi-finished or end-use products containing said yarn, especially to ropes and ballistic-resistant composites, are also disclosed.

First claim

1 . A preformed sheet comprising four mono-layers, each mono-layer comprising filaments from multifilament polyethylene yarn, the polyethylene having an IV of between 8 and 40 dl/g as measured on decalin solutions at 135° C., wherein said filaments in said mono-layers are spread uni-directionally; and wherein the direction of the filaments in each mono-layer is rotated with respect to the direction of the filaments in an adjacent layer, and wherein the preformed sheet exhibits a specific energy absorption of more than 265 and at most 479 J·kg/m 2 against a 9*19 mm FMJ Parabellum FMJ bullet, as measured on panels assembled from a plurality of the preformed sheets having an areal density of 2.0 kg/m 2 .

2 . The preformed sheet of claim 1 , wherein the preformed sheet exhibits a specific energy absorption of between 280 and 479 J·kg/m 2 against a 9*19 mm FMJ Parabellum FMJ bullet.

3 . The preformed sheet of claim 1 , wherein the preformed sheet exhibits a specific energy absorption of between 291 and 479 J·kg/m 2 against a 9*19 mm FMJ Parabellum FMJ bullet.

4 . The preformed sheet of claim 1 , wherein the preformed sheet exhibits a specific energy absorption of between 300 and 479 J·kg/m 2 against a 9*19 mm FMJ Parabellum FMJ bullet.

5 . The preformed sheet of claim 1 , wherein the preformed sheet exhibits a specific energy absorption of between 280 and 442 J·kg/m 2 against a 9*19 mm FMJ Parabellum FMJ bullet.

6 . The preformed sheet of claim 1 , wherein the preformed sheet exhibits a specific energy absorption of between 291 and 442 J·kg/m 2 against a 9*19 mm FMJ Parabellum FMJ bullet.

7 . The preformed sheet of claim 1 , wherein the preformed sheet exhibits a specific energy absorption of between 300 and 442 J·kg/m 2 against a 9*19 mm FMJ Parabellum FMJ bullet.

8 . The preformed sheet of claim 1 , wherein the preformed sheet exhibits a specific energy absorption of between 291 and 391 J·kg/m 2 against a 9*19 mm FMJ Parabellum FMJ bullet.

9 . The preformed sheet of claim 1 , wherein each of the mono-layers has an areal density of between 18.4 and 65.5 g/m 2 .

10 . The preformed sheet of claim 1 , wherein each of the mono-layers has an areal density of between 18.4 and 58.5 g/m 2 .

11 . The preformed sheet of claim 1 , wherein each of the mono-layers has an areal density of between 18.4 and 40.3 g/m 2 .

12 . The preformed sheet of claim 1 , wherein each of the mono-layers has an areal density of between 20.2 and 40.3 g/m 2 .

13 . The preformed sheet of claim 1 , wherein each of the mono-layers has an areal density of between 22.2 and 37.6 g/m 2 .

14 . The preformed sheet of claim 1 , wherein the preformed sheet comprises a binder in an amount less than 30 mass % based on the mass of the preformed sheet.

15 . The preformed sheet of claim 14 , wherein the amount of the binder is less than 20 mass % based on the mass of the preformed sheet.

16 . The preformed sheet of claim 14 , wherein the amount of the binder is less than 15 mass % based on the mass of the preformed sheet.

17 . The preformed sheet of claim 14 , wherein the amount of the binder is between 10 and 23 mass % based on the mass of the preformed sheet.

18 . The preformed sheet of claim 14 , wherein the amount of the binder is between 10 and 18 mass % based on the mass of the preformed sheet.

19 . The preformed sheet of claim 1 , wherein the mono-layers have an areal density of between 18.4 and 65.5 g/m 2 and the preformed sheet comprises a binder in an amount between 10 and 23 mass %, based on the mass of the preformed sheet.

20 . The preformed sheet of claim 19 , wherein the mono-layers have an areal density of between 18.4 and 40.3 g/m 2 and the preformed sheet comprises a binder in an amount between 10 and 23 mass %, based on the mass of the preformed sheet.

21 . The preformed sheet of claim 19 , wherein the mono-layers have an areal density of between 18.4 and 40.3 g/m 2 and the preformed sheet comprises a binder in an amount between 10 and 18 mass %, based on the mass of the preformed sheet.

22 . The preformed sheet of claim 19 , wherein the mono-layers have an areal density of between 20.2 and 40.3 g/m 2 and the preformed sheet comprises a binder in an amount between 10 and 23 mass %, based on the mass of the preformed sheet.

23 . The preformed sheet of claim 19 , wherein the mono-layers have an areal density of between 22.2 and 37.6 g/m 2 and the preformed sheet comprises a binder in an amount between 10 and 23 mass %, based on the mass of the preformed sheet.

24 . The preformed sheet according to claim 1 , wherein the polyethylene has an IV of between 10 and 30 dl/g

25 . The preformed sheet according to claim 24 , wherein the polyethylene has an IV of between 12 and 28 dl/g

26 . The preformed sheet according to claim 24 , wherein the polyethylene has an IV of between 15 and 25 dl/g

27 . The preformed sheet according to claim 1 , wherein said sheet further comprises at least one film layer.

28 . The preformed sheet according to claim 27 , wherein said sheet further comprises a film layer on both of its outer sides.

29 . The preformed sheet according to claim 27 , wherein said film is a polyethylene film having a weight of about 7 g/m 2 .

30 . A ballistic-resistant article comprising the preformed sheet according to claim 1 .

Assignees

• Dsm Ip Assets Bv

Inventors

• Simmelink Joseph Arnold Paul Maria
• Mencke Jacobus Johannes
• Jacobs Martinus Johannes Nicolaas
• Marissen Roeloef

Classifications

• F41H5/0485

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

• D07B2801/10

  Smallest filamentary entity of a rope or strand, i.e. wire, filament, fiber or yarn · CPC title

• D01D4/02

  Spinnerettes (alloys therefor C22C) · CPC title

• Y10T442/2623

  Ballistic resistant · CPC title

• D07B2205/2014

  High performance polyolefins, e.g. Dyneema or Spectra · CPC title