Cord comprising multifilament para-aramid yarn comprising non-round filaments

Patent metadata

Field	Value
Publication number	US-10633767-B2
Application number	US-201615564569-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	Apr 22, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A cord including multifilament para-aramid yarn comprising filaments, wherein the filaments have a non-round cross section having a smaller and a larger dimension, where the cross-sectional aspect ratio between the larger and the smaller dimension is 1.5-10 and the smaller dimension of the cross section has a maximum of 50 μm and wherein the para-aramid has at least 90% para bonds between the aromatic moieties. The cords have excellent fatigue properties.

First claim

The invention claimed is:

1. Cord comprising a multifilament para-aramid yarn comprising filaments, wherein the filaments have a non-round cross section having a smaller dimension and a larger dimension, where a cross-sectional aspect ratio between the larger dimension and the smaller dimension is in a range from 1.5 to 10 and the smaller dimension of the cross section has a maximum thickness of 50 μm, wherein the para-aramid has at least 90% para bonds between the aromatic moieties, and wherein the cord comprises a resorcinol-formaldehyde-latex adhesive.

2. Cord of claim 1 , wherein the cross-sectional aspect ratio between the larger dimension and the smaller dimension is in the range from 2 to 8.

3. Cord of claim 1 , wherein the larger dimension has a maximum length of 100 μm.

4. Cord of claim 1 , wherein the para-aramid yarn is para-phenylene terephthalamide yarn.

5. Cord of claim 1 , having a linear density of at least 25 dtex.

6. A tire, belt, hose, flowline, rope or umbilical incorporating the cord of claim 1 .

7. Process to manufacture a cord comprising multifilament para-aramid yarn comprising filaments, wherein the filaments have a non-round cross section having a smaller dimension and a larger dimension, where a cross-sectional aspect ratio between the larger dimension and the smaller dimension is in a range from 1.5 to 10 and the smaller dimension of the cross section has a maximum thickness of 50 μm, wherein the para-aramid has at least 90% para bonds between the aromatic moieties, and wherein the cord comprises a resorcinol-formaldehyde-latex adhesive, comprising the steps of: i) dissolving the para-aramid in sulfuric acid to obtain a dope; ii) extruding the dope through a spinneret having multiple non-round nozzles to obtain a multifilament yarn, where the nozzles have a rectangular cross section; iii) coagulating the multifilament yarn in an aqueous solution, iv) combining at least two of the obtained multifilament yarns.

8. Cord of claim 1 , wherein the cross-sectional aspect ratio between the larger dimension and the smaller dimension is in the range from 2.5 to 6.

Assignees

• Teijin Aramid Bv

Inventors

• De Jong Jorrit
• Van Den Tweel Michel H J
• Elkink Frederik
• Busscher Leonardus A G

Classifications

• D02G3/447

  Yarns or threads for specific use in general industrial applications, e.g. as filters or reinforcement · CPC title

• D07B1/025

  comprising high modulus, or high tenacity, polymer filaments or fibres, e.g. liquid-crystal polymers · CPC title

• D01D5/253 Primary

  with a non-circular cross section; Spinnerette packs therefor (D01D5/38 takes precedence) · CPC title

• D01F6/605

  from aromatic polyamides · CPC title

• D07B2201/2009

  characterised by the materials used · CPC title