Tetrafluoroethylene and perfluorinated allyl ether copolymers

Patent metadata

Field	Value
Publication number	US-11028198-B2
Application number	US-201716325831-A
Country	US
Kind code	B2
Filing date	Aug 1, 2017
Priority date	Aug 17, 2016
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A copolymer having tetrafluoroethylene units and second polymerized monomer units in a range from 0.2 to 1 percent by weight, based on the total weight of the copolymer. Rf is a linear or branched perfluoroalkyl group having from 1 to 8 carbon atoms and optionally interrupted by one or more —O— groups, n is independently from 1 to 6, and z is 0, 1, or 2. The copolymer has a melt flow index in a range from 0.02 grams per 10 minutes to 19.4 grams per 10 minutes. The copolymer can be extruded to make articles, such as insulated cables. A method of making the copolymer is also disclosed.

First claim

What is claimed is:

1. A copolymer comprising
at least 66% by weight based on the total weight of the copolymer of tetrafluoroethylene units;
units independently represented by formula

in a range from 0.2 to 12% by weight, based on the total weight of the copolymer, wherein n is independently from 1 to 6, z is 0, 1, or 2, and Rf is a linear or branched perfluoroalkyl group having from 1 to 8 carbon atoms and optionally interrupted by one or more —O— groups;
from 5 to 22% by weight based on the total weight of the copolymer of units derived from hexafluoropropylene; and
units represented by formula

wherein a is 0 or 1, each b is independently from 1 to 4, c is 0 to 4, d is 0 or 1, e is 1 to 6, and X is independently —F, —NH 2 , —OH, or —OZ, and wherein Z is independently a metallic cation or a quaternary ammonium cation,
wherein the copolymer has a melt flow index in a range from 1 to 19 grams per 10 minutes; and
wherein the copolymer has up to 200 —SO 2 X groups per 10 6 carbon atoms and up to 100 unstable end groups per 10 6 carbon atoms, wherein X is independently —F, —NH 2 , —OH, or —OZ, wherein Z is independently a metallic cation or a quaternary ammonium cation, wherein the unstable end groups are selected from —COOM, —CH 2 OH, —COF, and —CONH 2 , and wherein M is independently an alkyl group, a hydrogen atom, a metallic cation or a quaternary ammonium cation.

2. The copolymer of claim 1 , wherein Rf is —CF 3 , and wherein n is 1 or 3.

3. The copolymer of claim 1 , wherein z is 1 or 2.

4. The copolymer of claim 1 , wherein z is 0.

5. The copolymer of claim 1 , comprising the units independently represented by formula

in a range from 0.02 to 1.9 mole percent based on the total amount of the copolymer.

6. The copolymer of claim 1 , further comprising units derived from at least one perfluorinated terminal olefin independently having from 4 to 8 carbon atoms.

7. The copolymer of claim 1 , wherein the —SO 2 X groups comprise —SO 2 X end groups.

8. The copolymer of claim 1 , wherein
(i) the copolymer comprises 10 percent to 17 percent by weight, based on the total weight of the copolymer of the units derived from hexafluoropropylene and
(ii) the copolymer has a melting point in a range from 220° C. to 285° C.

9. The copolymer of claim 1 , being provided as an aqueous dispersion comprising the copolymer.

10. A method of making an extruded article, the method comprising extruding a melted composition comprising the copolymer of claim 1 .

11. The method of claim 10 , wherein the extruded article comprises at least one of a film, tube, pipe, or hose.

12. The method of claim 10 , wherein the extruded article is a conductor having the copolymer extruded thereon.

13. An extruded article comprising the copolymer of claim 1 .

14. The extruded article of claim 13 , wherein the extruded article comprises at least one of a film, tube, pipe, or hose.

15. The extruded article of claim 13 , wherein the extruded article is a conductor having the copolymer extruded thereon.

16. A method of making the copolymer of claim 1 , the method comprising copolymerizing components comprising tetrafluoroethylene; at least one compound independently represented by formula CF 2 ═CFCF 2 (OC n F 2n ) Z ORf, wherein n is independently from 1 to 6, z is 0, 1, or 2, and Rf is a linear or branched perfluoroalkyl group having from 1 to 8 carbon atoms and optionally interrupted by one or more —O— groups; hexafluoropropylene; and a monomer resulting in units of

Assignees

• 3M Innovative Properties Co

Inventors

• Kaspar Harald
• Hintzer Klaus
• Hirschberg Markus E
• Koenigsmann Herbert
• Weilandt Karl D
• Zipplies Tilman C

Classifications

• C08F214/26 Primary

  Tetrafluoroethene · CPC title

• C08F214/182

  Monomers containing fluorine not covered by the groups C08F214/20 - C08F214/28 · CPC title

• C08F214/28

  Hexyfluoropropene · CPC title

• H01B3/445

  from vinylfluorides or other fluoroethylenic compounds · CPC title

• C08L27/18

  Homopolymers or copolymers or tetrafluoroethene · CPC title