Melt-processible poly(tetrafluoroethylene)

• US 20030069343A1
• Filed: 03/18/2002
• Published: 04/10/2003
• Est. Priority Date: 08/06/1998
• Status: Abandoned Application

• Current Assignee: Cees Bastiaansen, Jeroen Visjager, Paul Smith
• Original Assignee: Cees Bastiaansen, Jeroen Visjager, Paul Smith
• Inventors: Visjager, Jeroen, Smith, Paul, Bastiaansen, Cees
• Application Number:
  US10/098,613
• Publication Number:
  US 20030069343A1
• Time in Patent Office: Days
• US Class Current: 524/431
• CPC Class Codes: C08F 14/26 Tetrafluoroethene
• CPC Class Codes: C08F 214/262 with fluorinated vinyl ethers
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 27/18 Homopolymers or copolymers or tetrafluoroethene
• CPC Class Codes: C09J 127/18 Homopolymers or copolymers of tetrafluoroethene
• CPC Class Codes: H05K 1/034 containing halogen

Abstract

The present invention provides melt-processible poly(tetrafluoroethylene) polymers having a peak melting temperature above 315° C. and good mechanical properties at room temperature and at elevated temperatures, for instance a strain at break (25° C.) of at least 125% and a tensile strength (150° C.) of at least 7 MPa, both determined at a strain rate of 100/min.

Claims

1. A poly(tetrafluoroethylene) polymer having:

(i) a melt flow index (372°

C.;

10 kg) of at least 0.1 g/10 min;

(ii) a strain at break at (25°

C.;

100/min) of at least 125%;

(iii) a tensile strength (150°

C.;

100/min) of at least 7 MPa;

(iv) a co-monomer content below 2.2 wt %;

(v) a peak melting temperature above 315°

C.;

(vi) a crystallinity below 60%; and

(vii) one or more of the following parameters;

(a) a peak melting temperature below 320°

C.;

(b) a crystallinity between 30% and 54%;

(c) a melt-flow index (372°

C./10 kg) below 10 g/10 min;

(d) a co-monomer content above 1 wt %.

2. The polymer of claim 1, wherein said polymer has a peak melting temperature in the range of above 315°

C. to below 320°

C.

3. The polymer of claim 1, wherein said polymer has a crystallinity between 30% and 54%.

4. The polymer of claim 1, wherein said polymer has a melt-flow index (372°

C./10 kg) below 10 g/10 min.

5. The polymer of claim 1, wherein said polymer has a co-monomer content above 1 wt %.

6. The polymer according to any one of claims 1-5, wherein said polymer has two or more of said parameters (a)-(d).

7. The polymer according to any one of claims 1-5, wherein said polymer has three or more of said parameters (a)-(d).

8. The polymer of claim 1, wherein said polymer has all four of said parameters (a)-(d).

9. The polymer according to any one of claims 1-8, wherein said polymer has a melt flow index (372°

C.;

10 kg) of at least 0.6 g/10 min.

10. The polymer according to any one of claims 1-9, wherein said polymer has a strain at break at (25°

C.;

100/min) of at least 400%.

11. The polymer according to any one of claims 1-10, wherein said polymer has a tensile strength (150°

C.;

100/min) of at least 15 MPa.

12. The polymer according to any one of claims 1-11, wherein said polymer has a comonomer content between 1 and 1.4 wt %.

13. The polymer according to any one of claims 1-12, wherein said polymer has a peak melting temperature in the range of 316-319°

C.

14. The polymer according to any one of claims 1-13, wherein said polymer has a crystallinity in the range of 35-44%.

15. The polymer according to any one of claims 1-13, wherein said polymer comprises a co-monomer selected from the group consisting of hexafluoropropylene, perfluoro(methyl vinyl ether), perfluoro(ethyl vinyl ether), perfluoro(propyl vinyl ether), perfluoro-(2,2-dimethyl-1,3-dioxole).

16. The polymer according to any one of claims 1-13, wherein said polymer comprises a perfluor(alkyl vinyl ether) co-monomer.

17. The polymer according to any one of claims 1-13, wherein said polymer comprises a perfluoro(propyl vinyl ether) co-monomer.

18. The polymer according to any one of claims 1-13, wherein said polymer comprises a hexafluoropropylene co-monomer.

19. A composition comprising the polymer according to any one of claims 1-18.

20. The composition of claim 19, wherein said composition comprises at least 20 wt % of said polymer.

21. The composition according to any one of claims 19-20, wherein said composition comprises at least 5 wt % of additives selected from the group consisting of colorants, fillers, reinforcing matter, blowing agents, foaming agents, and electrically conducting matter.

22. The composition according to any one of claims 19-21, wherein said composition comprises, titanium dioxide, carbon, graphite, glassfiber, molybdenum, bronze, or stainless steel.

23. A blend of two or more poly(tetrafluorethylene) polymers, at least one of said two or more poly(tetrafluorethylene) polymers being a polymer according to any one of claims 1-18.

24. An article comprising the polymer according to any one of claims 1-18.

25. The article of claim 24, wherein said article is formed at least in part by melt-processing said polymer.

26. A method comprising:

melt-processing the polymer according to any one of claims 1-18.

27. The method of claim 26, wherein said method includes injection molding, transfer-molding, melt-blowing, melt-extrusion, melt-spinning, and/or blow-molding.

28. An article obtained by the method of claim 27.