# US 8,541,499 B2 · Process for manufacturing clean fluoropolymers

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,541,499 B2
- Document ID: US8541499B2
- Status: Granted
- Kind: B2
- Application number: 12/682,702
- Filed: 2008-10-10
- Published: 2010-12-02
- Granted: 2013-09-24
- Earliest claimed: 2007-10-12
- Assignees: 3M Innovative Properties Company
- Applicants: Klaus Hintzer; Kai H. Lochhaas; Michael Jürgens; Harald Kaspar; Tilman C. Zipplies; André Streiter
- Inventors: Klaus Hintzer; Kai H. Lochhaas; Michael Jürgens; Harald Kaspar; Tilman C. Zipplies; André Streiter
- Web page: https://patentgrep.com/patent/US8541499B2

## CPC

- C08K 5/19: Quaternary ammonium compounds
- C08F 2/24: with the aid of emulsifying agents
- C08F 14/18: Monomers containing fluorine
- C08F 214/18: Monomers containing fluorine
- C08K 5/095: Carboxylic acids containing halogens
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

There is provided a fluoroelastomer characterized by containing one type or more types of fluorinated emulsifiers represented by the formula: F—(CF2)t-[O(CF2)n]m-O—(CHF)o-(CF2)p-X where m=0 to 3; n=1 to 5; o=0 to 1; p=1 to 3; t=1 to 10; and where when t=2 than o≠0; and further where X is selected from a group consisting of a carboxyl acid group and a salt of a carboxylic acid group. A method for preparing fluoroelastomers by using such fluorinated emulsifiers in emulsion polymerization of fluoromonomers and articles containing such fluoroelastomers are also provided. A fluorinated elastomer dispersion including an aqueous mixture of a crosslinkable fluorinated elastomer and such fluorinated emulsifiers are also provided. The fluoroelastomers created with such fluorinated emulsifiers are essentially free of cations other than NH4+ and H+ and have a low glass transition temperature.

## Claims

### Claim 1

A fluorinated elastomer composition comprising an aqueous mixture of a crosslinkable fluorinated elastomer and a fluorinated emulsifier represented by the formula:
F—(CF2)t-[O(CF2)n]m-O—(CHF)o-(CF2)p-X
wherein m=0 to 3; n=1 to 5; o=1; p=1 to 3; t=1 to 10; and
further wherein X is selected from a group consisting of a carboxyl acid group and a salt of a carboxylic acid group.

### Claim 2 (depends on 1)

The fluoroelastomer of claim 1, wherein the fluoroelastomer comprises a polymer derived from at least one fluoromonomer selected from tetrafluoroethylene, vinylidene fluoride, hexafluoropropylene, a perfluoro(alkyl or alkoxyalkyl vinyl ether) represented by CF2═C(ORf)nF2-n, wherein Rf is a C1-9 perfluoroalkyl group or perfluoro(alkoxyalkyl) group containing one or more ether bonds, n is an integer of 1 or 2, and each carbon chain may be linear or contain branches, or may have a cyclic structure, a perfluoro(alkyl or alkoxyalkyl allyl ether) represented by CF2═CFC(ORf)nF2-n, wherein Rf is a C1-9 perfluoroalkyl group or perfluoro(alkoxyalkyl) group containing one or more ether bonds, n is an integer of 1 or 2, and each carbon chain may be linear or contain branches, or may have a cyclic structure, and wherein the fluoroelastomers further comprisies at least one co-monomer selected from chlorotrifluoroethylene, propylene and ethylene, and optionally, a cure site monomer.

### Claim 3 (depends on 1)

The fluoroelastomer of claim 1, wherein the fluoroelastomer is a polymer derived from at least one copolymer selected from tetrafluoroethylene/propylene, tetrafluoroethylene/propylene/vinylidene fluoride, vinylidene fluoride/hexafluoropropylene, tetrafluoroethylene/vinylidene fluoride/hexafluoropropylene, tetrafluoroethylene/CF2═CFOCF3, tetrafluoroethylene/CF2═CFOC3F7, tetrafluoroethylene/CF2═CFOCF3/CF2═CFOC3F7, tetrafluoroethylene/CF2═C(OC2F5)2, vinylidene fluoride/CF2═CFOC3F7, ethylene/hexafluoropropylene, and such a copolymer having a cure site monomer further copolymerized therewith.