Polyamide yarn spinning process and modified yarn
Provided by this invention is a modified synthetic polyamide polymer yarn produced by an improved melt extrusion process. Yarn of this invention are either partially oriented yarns (POY) or drawn oriented yarns. The improved process provides for modification of a polymer in a melt extruder. Following this modification of the polymer, a filament forming process step is provided which is coupled to a drawing stage prior to winding a package of yarn.
1 . A process for spinning a polyamide filament comprising the steps of: providing polyamide polymer to a melt extruder; providing a triamino compound capable of branching the polyamide polymer; charging said triamino compound to said melt extruder at an injection point selected to provide sufficient contact time for said triamino compound and said polyamide polymer to form a melt polymer; melting said polyamide polymer; and extruding the melt polymer to form a filament.
2 . The process of claim 1 further comprising quenching the filament.
3 . The process of claim 2 further comprising drawing the filament.
4 . The process of claim 3 further comprising winding up the filament.
5 . The process of claim 1 wherein the contact time is less than about 12 minutes.
6 . The process according to claim 1 wherein the triamino compound is selected from the group comprising TAN and TREN.
7 . The process according to claim 1 wherein the draw ratio is about 1 to about 2.
8 . A synthetic polyamide yarn comprising nylon 66 polymer having a formic acid relative viscosity (RV) of about 40 to about 55 and having an elongation at break of about 60% to about 100%, having a triamino compound content of about 0.01 to 0.10 weight percent, wherein the yarn is provided by the process according to claim 1 comprising a draw ratio of less than about 2.0.
9 . The synthetic polyamide yarn of claim 8 comprising an elongation at break of less than about 60% and comprising a draw ratio of about 1.1 to about 2.0.
10 . In a process for spinning a polyamide yarn comprising the steps of: providing to a melt extruder polyamide polymer chips, melting the chips and forwarding the melted polymer to an extrusion die during a time period, forming at least a filament, quenching the filament, optionally drawing the filament according to a draw ratio and winding up the filament; the improvement comprising: providing at the entrance to the extruder a triamino compound, capable of branching the polymer, characterized by a time period during which the triamino compound and polymer are formed into a melt polymer.
11 . The process according to claim 10 wherein the time period during which the triamino compound and polymer are formed into a melt polymer is less than about 12 minutes.
12 . The process according to claim 11 wherein the triamino compound is selected from the group comprising TAN and TREN.
13 . The process according to claim 12 wherein the draw ratio is about 1 to about 2.
14 . A synthetic polyamide yarn comprising nylon 66 polymer having a formic acid relative viscosity (RV) of about 40 to about 55 and having an elongation at break of about 60% to about 100%, having a triamino compound content of about 0.01 to 0.10 weight percent, wherein the yarn is provided by the process according to claim 1 comprising a draw ratio of about 1.0.
15 . The synthetic polyamide yarn of claim 5 comprising an elongation at break of less than about 60% and comprising a draw ratio of about 1.1 to about 2.0.