Highly fluorinated polymers

Patent metadata

Field	Value
Publication number	US-9938403-B2
Application number	US-201614992223-A
Country	US
Kind code	B2
Filing date	Jan 11, 2016
Priority date	Dec 4, 2012
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A method of making a highly fluorinated polymers and resulting aqueous mixtures. The method comprising polymerizing one or more perfluorinated monomers in an aqueous emulsion polymerization in the presence of a polymerizable fluorinated emulsifier to form a perfluorinated polymer. The polymerizable fluorinated emulsifier has the formula X 2 C═CX(CF 2 ) m (CH 2 ) n [O—(CX 2 ) p ] q —[O—(CX 2 ) r ] s −[O—(CX 2 —CX 2 )] t —[(O) w —(CX 2 ) u ] v —[CH 2 ] z —Y. The method also provides for isolating the highly fluorinated polymer and post-fluorinating the isolated highly fluorinated polymer.

First claim

What is claimed is:

1. An aqueous mixture comprising:
a polymerization product of a perfluorinated monomer and a polymerizable fluorinated emulsifier wherein the polymerizable fluorinated emulsifier is selected from the group consisting of:
CF 2 ═CF—O—(CF 2 ) p —O—(CF 2 ) r —Y where Y is COOM or SO 3 M, p is an integer selected from at least 3 and at most 6, r is an integer selected from at least 1 and at most 6, and M is H, an alkali metal, or NH 4 ,
wherein the resulting polymer comprises a perfluorinated backbone.

2. The aqueous mixture of claim 1 , wherein the perfluorinated monomers are selected from the group consisting of: tetrafluoroethylene, hexafluoropropylene, perfluoroalkoxy alkenes, perfluoro alkyl vinyl ethers, perfluoroalkoxy vinyl ethers, perfluoro-5-oxa-hept-6-ene sulphonic acid fluoride, CF 2 ═CFO(CF 2 ) 5 CN, and combinations thereof.

3. The aqueous mixture of claim 1 , wherein the aqueous mixture is substantially free of a non-polymerizable fluorinated emulsifier.

4. The aqueous mixture of claim 1 , wherein the aqueous mixture is substantially free of saturated fluorinated emulsifier.

5. The aqueous mixture of claim 1 , wherein the polymerizable fluorinated emulsifier is CF 2 ═CF—O—(CF 2 ) 3 —O—CF 2 —COOM, where M is H, an alkali metal, or NH 4 .

6. The aqueous mixture of claim 1 , wherein an amount of polymerizable fluorinated emulsifier is at least 50 parts per million based on a total amount of the perfluorinated monomer.

7. The aqueous mixture of claim 1 , wherein an amount of polymerizable fluorinated emulsifier is at most 10000 parts per million based on a total amount of the perfluorinated monomer.

Assignees

• 3M Innovative Properties Co

Inventors

• Hintzer Klaus
• Kaspar Harald
• Koenigsmann Herbert
• Traunspurger Helmut
• Zipplies Tilman C

Classifications

• C08L27/18 Primary

  Homopolymers or copolymers or tetrafluoroethene · CPC title

• C08F214/262 Primary

  with fluorinated vinyl ethers · CPC title