Dual-terminated polyamide for high speed spinning application

Patent metadata

Field	Value
Publication number	US-10494740-B2
Application number	US-201615388999-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Dec 23, 2015
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

Methods of producing a polyamide filaments and fibers are provided. The methods include providing a dual-terminated polyamide and spinning the dual-terminated polyamide at a speed of 3500 m/min to 8000 m/min to form a fiber. In one embodiment, the polyamide has an amine endgroup concentration of 25 mmol/kg to 40 mmol/kg and a carboxyl endgroup concentration of 18 mmol/kg to 50 mmol/kg. Fibers and yarns comprising polyamide filaments and fibers formed from the method are also disclosed.

First claim

What is claimed is:

1. A method of producing a plurality of fibers, the method comprising:
providing a dual-terminated polyamide-6 (PA-6) having an amine endgroup concentration of 25 mmol/kg to 40 mmol/kg, a carboxyl endgroup concentration of 18 mmol/kg to 50 mmol/kg, and a relative viscosity of 2.6 RV to 3.0 RV; and
spinning the dual-terminated polyamide-6 (PA-6) at a speed of 3500 m/min to 8000 m/min to form the fibers.

2. The method of claim 1 , wherein spinning includes heating the dual-terminated polyamide-6 (PA-6) to a temperature of 230° C. to 300° C.

3. The method of claim 1 , wherein spinning includes extruding the dual-terminated polyamide-6 (PA-6) through a spinneret including tri-lobal shape holes, wherein the tri-lobal shape holes define an R value of 0 to 0.1 mm.

4. The method of claim 1 , wherein the polyamide fibers each comprises a plurality of filaments, and the polyamide fibers have a denier per filament of 1.5 to 5.

5. The method of claim 1 , wherein the dual-terminated polyamide-6 (PA-6) includes amine endgroups and carboxyl endgroups with different, chemically distinct terminators.

6. The method of claim 1 , wherein the dual-terminated polyamide-6 (PA-6) has an amine endgroup concentration of 27 mmol/kg to 37 mmol/kg.

7. The method of claim 1 , wherein the dual-terminated polyamide-6 (PA-6) has an amine endgroup concentration of 30 mmol/kg to 35 mmol/kg.

8. The method of claim 1 , wherein the dual-terminated polyamide-6 (PA-6) has a carboxyl endgroup concentration of 20 mmol/kg to 40 mmol/kg.

9. The method of claim 1 , wherein the dual-terminated polyamide-6 (PA-6) has a carboxyl endgroup concentration of 22 mmol/kg to 30 mmol/kg.

10. The method of claim 1 , wherein the dual-terminated polyamide-6 (PA-6) has a relative viscosity of 2.7 RV to 3.0 RV.

11. The method of claim 1 , wherein the dual-terminated polyamide-6 (PA-6) has a relative viscosity of 2.8 RV to 3.0 RV.

12. The method of claim 1 , wherein the dual-terminated polyamide-6 (PA-6) has a polydispersity index less than 1.8.

13. The method of claim 1 , wherein the dual-terminated polyamide-6 (PA-6) has an extractables content of less than 0.8 wt. %.

14. The method of claim 1 , wherein prior to the spinning step, the dual-terminated polyamide-6 (PA-6) is heated to a temperature of 240° C. to 300° C.

15. The method of claim 1 , wherein prior to the spinning step, the dual-terminated polyamide-6 (PA-6) is heated to a temperature of 250° C. to 290° C.

16. The method of claim 1 , wherein the spinning step is carried out at a speed of 4000 m/min to 6000 m/min.

17. The method of claim 4 , wherein the polyamide fibers each comprises a plurality of filaments, and the polyamide fibers have a denier per filament of 1.7 to 5.

18. The method of claim 4 , wherein the polyamide fibers each comprises a plurality of filaments, and the polyamide fibers have a denier per filament of 1.7 to 3.

Assignees

• Advansix Resins & Chemicals Llc

Inventors

• Zhang Yu
• Wang Min
• Peng Shuwen
• Loy David J
• Wei Jie
• Chen Tingzhi

Classifications

• C08G69/14

  Lactams · CPC title

• C08G69/48

  Polymers modified by chemical after-treatment · CPC title

• D01F6/60

  from polyamides (from polyamino acids or polypeptides D01F6/68) · CPC title

• C08G69/22

  Beta-lactams · CPC title

• D01D5/08

  Melt spinning methods {(D01D5/0023 takes precedence)} · CPC title