Poly(aryletherketone)s and process for making them
Poly(aryletherketone)s comprising fluoride end groups having improved melt stability, lower gel content and lower color are provided.
1. A poly(aryletherketone), comprising:
[F] fluoride end groups,
wherein
[ F]·VM 0.29 >265
wherein:
[F] is a content of the fluoride end groups, expressed in μeq/g, and
VM is a melt viscosity of the poly(aryletherketone) at 410° C. and 46.4 s −1 as measured according to ASTM D3835, expressed in (Pa.s).
2. A poly(aryletherketone), comprising;
fluoride end groups; and
end groups other than fluoride;
wherein a content of end groups other than fluoride is less than 70 μeq/g.
3. A poly(aryletherketone), comprising:
fluoride end groups;
wherein
the poly(aryletherketone) is a powder,
a lightness L*of the powder is above 86, and
a* and b* coordinates of the powder are respectively between −1 and 1, and between 4 and 16, as measured according to ASTM E308 using Cool White Fluorescent as illuminant.
4. The poly(aryletherketone) according to claim 1 , wherein
a melt viscosity ratio VR 40 is between 0.90 and 1.10,
the melt viscosity ratio is defined as
VR 40 =V 40 /V 10 ,
V 40 is a melt viscosity at 400° C. and 10 rad/s after 10 minutes, and
V 10 is a melt viscosity at 400° C. and 10 rad/s after 40 minutes, as measured according to ASTM D4440.
5. The poly(aryletherketone) of claim 2 , wherein the end groups other than fluoride end groups comprise hydroxyl, quinone, and/or chlorine end groups.
6. The poly(aryletherketone) of claim 2 , wherein the poly(aryletherketone) comprises less than 69 μeq/g of end groups other than fluoride end groups, based on the total number of end groups.
7. The poly(aryletherketone) of claim 2 , wherein the poly(aryletherketone) comprises less than 66 μeq/g of end groups other than fluoride end groups, based on the total number of end groups.
8. The poly(aryletherketone) of claim 3 , wherein the poly(aryletherketone) has a lightness L* of above 88.
9. The poly(aryletherketone) of claim 3 , wherein the poly(aryletherketone) has an a* coordinate of more than −0.6 and less than 0.8.
10. The poly(aryletherketone) of claim 3 , wherein the poly(aryletherketone) has a b* coordinate of more than 4.2 and less than 15.0.
11. The poly(aryletherketone) of claim 4 , wherein the poly(aryletherketone) has a VR 40 of more than 0.91 and less than 1.09.
12. The poly(aryletherketone) of claim 4 , wherein the poly(aryletherketone) has a VR 40 of more than 0.92 and less than 1.08.
13. The poly(aryletherketone) of claim 3 , wherein a compression molded plaque of 2.5 mm thickness comprising the poly(aryletherketone) has a lightness L* according to the relationship:
L*> 90−17 (η int )
wherein L* is measured according to ASTM E308 using D 65 illuminant and η int is the intrinsic viscosity measured in methyl sulfonic acid at 30° C., according to ASTM2857, expressed in dL/g.
14. The poly(aryletherketone) of claim 13 , wherein the compression molded plaque has a lightness L* according to the relationship: L*>93−17 (η int ).
15. The poly(aryletherketone) of claim 13 , wherein the compression molded plaque has a lightness L* according to the relationship: L*>95−17 (72 int ).
16. The poly(aryletherketone) of claim 13 , wherein the compression molded plaque has lightness L* of above 70.
17. The poly(aryletherketone) of claim 13 , wherein the compression molded plaque has a* and b* coordinates respectively between −1 and 3, and between 5 and 20, as measured according to ASTM E308 using D 65 illuminant.
18. The poly(aryletherketone) of claim 17 , wherein the compression molded plaque has an a* coordinate of more than −0.5 and less than 2.5.
19. The poly(aryletherketone) of claim 17 , wherein the compression molded plaque has a b* coordinate of more than 6.5 and less than 18.5.