Aqueous process for making fluoropolymers

a fluoropolymer and water-based technology, applied in the field of water-based fluoropolymer making process, can solve the problems of insufficient use of ionic emulsifiers, inability to produce small particle size latex without inhibiting, and high cost of fluorinated surfactants used in emulsion polymerization of fluoropolymers

Inactive Publication Date: 2006-12-14
ARKEMA INC
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the fluorinated-surfactants typically used in emulsion polymerization of fluoropolymers, such as the ammonium salt of perfluoro octanoic acid or salts of perfluoro sulfonic acids are expensive.
The ionic emulsifiers are undesired for high purity applications due to high levels extractable ions.
Furthermore, hydrocarbon sulfonates act as implicit chain transfer agent in the emulsion polymerization of fluoropolymers, as a result, it cannot be used in sufficient amount to produce small particle size latex without inhibiting such polymerizations.
Second, the particle size of emulsifier free emulsion of fluoropolymers would be large; as a result, the shelf-life of latex would be very limited.
Third, the solid content of emulsifier free latex is limited to low or moderate solids, where in fact a high solid latex is desirable in variety of commercial applications.

Method used

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Examples

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examples

[0028] The glycol-based emulsifiers used in this example include polyethylene glycol acrylate (PEGA), polyethylene glycol (PEG), and polyethylene glycol phenol oxide (Triton X-100), polypropylene glycol acrylate (PPGA), and polypropylene glycol (PPG). Inspection of results in the following table indicates that a with a low loading of the emulsifiers, emulsions of fluoropolymers having particle sizes of approximately 100 nm were produced. The solid level of these novel emulsions were as high as 42%.

[0029] To a 1.7 liter agitated-autoclave reactor was added one liter of DI-water along with the reported amount of 10% aqueous solution of emulsifier (as shown in Table 1). The mixture was purged with argon and then heated to desired temperature. The reactor was then charged with VF2 / HFP to reach pressure of 4510 kPa. A continuous feed of the 1% aqueous initiator solution was added to the reaction and the pressure was maintained at 4480 kPa by adding as needed VF2 / HFP. After the pre-deter...

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Abstract

A novel aqueous polymerization process for making fluoropolymers is disclosed in which non-ionic non-fluorinated emulsifier is used to produce fluoropolymer emulsions. The emulsifiers used in the invention are those that contain segments of polyethylene glycol and / or polypropylene glycol with repeating units of 3 to 100.

Description

FIELD OF THE INVENTION [0001] The invention relates to a process for making fluoropolymers using non-fluorinated, non-ionic emulsifiers. The emulsifiers contain segments of polyethylene glycol and / or polypropylene glycol. BACKGROUND OF THE INVENTION [0002] Fluoropolymers are generally made by an aqueous dispersion process, which provides a suitable heat sink for controlling the heat of polymerization and can produce a high yield and high molecular weight relative to polymerization conducted in an organic solvent. In order to achieve stable dispersion or emulsion, a suitable surfactant or emulsifier must be employed. Fluorinated-surfactants are generally used because they can yield stable particle and high molecular weight fluoropolymers. However, the fluorinated-surfactants typically used in emulsion polymerization of fluoropolymers, such as the ammonium salt of perfluoro octanoic acid or salts of perfluoro sulfonic acids are expensive. They also present an environmental concern rel...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08K5/05
CPCC08F14/22C08F214/22C08K5/06C08L27/16C08L71/02C08F2/20C08F2/30C08L27/12C08L2666/14C08K5/05
Inventor AMIN-SANAYEI, RAMINOLMSTEAD, CHRISTYN
Owner ARKEMA INC
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