Cord comprising multifilament para-aramid yarn comprising non-round filaments
AssigneeTeijin Aramid B.V.
InventorsJorrit JONG DE, Michel H.J. TWEEL VAN DEN, Frederik ELKINK, Leonardus A.G. BUSSCHER
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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.
Claims7
Cord comprising a 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.
Process to manufacture a cord comprising 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 wherein the para-aramid has at least 90% para bonds between the aromatic moieties 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.
Dependencies are inferred from the claim text.