Process for the manufacture of polyetherketoneketone fiber

Patent metadata

Field	Value
Publication number	US-11326277-B2
Application number	US-201716347609-A
Country	US
Kind code	B2
Filing date	Nov 8, 2017
Priority date	Nov 8, 2016
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A process for manufacturing a fiber including polyetherketoneketone including the steps of: mixing polyetherketoneketone and sulfuric acid having a concentration of at least 90 wt % to obtain a spin dope and passing the spin dope through a spinneret into a coagulation bath, wherein the polyetherketoneketone is dissolved in the sulfuric acid to a concentration of 12 to 22 wt %. Also disclosed are fibers obtainable by the process and polyetherketoneketone fibers having a sulfur content of 0.001 to 5 wt %, based on the weight of the fiber, in particular such fibers having low or high crystallinity, as well as, hybrid yarns and composite materials.

First claim

The invention claimed is:

1. A process for manufacturing a polyetherketoneketone fiber comprising the steps of:
mixing polyetherketoneketone and sulfuric acid having a concentration of at least 90 wt % to obtain a spin dope and passing the spin dope through a spinneret into a coagulation bath, wherein the polyetherketoneketone is dissolved in the sulfuric acid to a concentration of 12 to 22 wt %,
wherein the spin dope comprises a polymer fraction and at least 60 wt % of the polymer fraction is polyetherketoneketone.

2. The process according to claim 1 , wherein the polyetherketoneketone comprises repeating units represented by Formula I and Formula II:
-A-C(═O)—B—C(═O)—  I

-A-C(═O)-D-C(═O)—  II,

where A is a -Ph-O-Ph- group, where Ph is a phenylene radical, B is 1,4-phenylene and D is 1,3-phenylene and wherein the ratio of repeating units represented by Formula I:Formula II is 100:0 to 0:100.

3. The process according to claim 1 , wherein the polyetherketoneketone has a melting temperature T m which is at least 295° C.

4. The process according to claim 1 further comprising heating the fiber in at least one heating step to a temperature in the range of 150 to 290° C.

5. The process according to claim 4 , wherein during heating step, a tension is applied which results in a drawing ratio of 1.5 to 10.

6. The process according to claim 4 , wherein the fiber is heated in a second heating step to a temperature in the range of 150 to 290° C.

7. The process according to claim 6 , wherein during the second heating step a tension is applied which results in a drawing ratio of the fiber of at most 1.5.

8. The process according to claim 1 , wherein the fiber after coagulation is only treated with solutions having a pH of at most 11.

9. The process according to claim 1 , wherein the spin dope comprises a polymer fraction and at least 70 wt % of the polymer fraction is polyetherketoneketone.

10. The process according to claim 1 , wherein the spin dope comprises a polymer fraction and at least 90 wt % of the polymer fraction is polyetherketoneketone.

Assignees

• Teijin Aramid Bv
• Arkema France

Inventors

• Boerstoel Hanneke
• Gebben Bert
• Nijenhuis Wido
• Jouanneau Julien
• Bussi Philippe

Classifications

• D01F6/665 Primary

  from polyetherketones, e.g. PEEK · CPC title

• D02J13/00

  Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass (heating, cooling or drying during spinning or twisting D01H; drying of yarns or the like, in general F26B) · CPC title

• D02J1/22

  Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch (stretch spinning D01D5/12) · CPC title

• D02G3/38

  Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, {e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn; (D02G3/32 takes precedence)}; (covering endless core threads with fibres by using open-end spinning techniques D01H4/00) · CPC title

• D01D5/06

  Wet spinning methods {(D01D5/0046 takes precedence)} · CPC title