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Aqueous process for making fluoropolymers

A fluoropolymer and polymer technology, applied in the field of manufacturing fluoropolymers, can solve the problems of limited shelf life of latex and large particle size of emulsion

Active Publication Date: 2009-10-07
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, the particle size of emulsifier-free emulsions of fluoropolymers can be very large; as a result, the shelf life of the latex can be very limited
Although the use of fluoropolymer dispersions in place of waste water was not contemplated by the inventors, it is still feasible with some difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] Glycol-based emulsifiers used in this example include polyethylene glycol acrylate (PEGA), polyethylene glycol (PEG), and polyethylene glycol octyl-phenyl ether (Triton X-100 ), polypropylene glycol acrylate (PPGA), polypropylene glycol (PPG), polyethylene glycol methacrylate (PEG-MA), dimethyl polyethylene glycol (DMPEG), polyethylene glycol butyl ether (PEGBE ), polypropylene glycol methacrylate (PPG-MA), polypropylene glycol dimethacrylate (PPG-DMA), and polytetramethylene glycol (PTMG). Looking at the results in the table below, it shows that at low loading of emulsifier, fluoropolymer emulsions with particle sizes of about 100 nm and higher were produced. These novel emulsions have solids levels as high as 42%.

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PUM

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Abstract

A novel aqueous polymerization process for making fluoropolymer dispersions is disclosed in which non-ionic non-fluorinated emulsifier is used to produce fluoropolymer emulsions. The emulsifiers contain blocks of polyethylene glycol, polypropylene glycol and / or polytetramethylene glycol. The process and fluoropolymer produced contain no fluorinated surfactant. The fluoropolymers have excellent resistance to discoloration.

Description

field of invention [0001] This invention relates to a method of making fluoropolymers using non-fluorinated, nonionic emulsifiers. These emulsifiers comprise blocks of polyethylene glycol, polypropylene glycol and / or polytetramethylene glycol. The method and resulting fluoropolymers do not contain fluorinated surfactants. These fluoropolymers have excellent resistance to fading. Background of the invention [0002] Fluoropolymers are generally manufactured by an aqueous dispersion process that provides a suitable heat sink to control the heat of polymerization and enables high yields and high molecular weights (relative to polymerizations performed in organic solvents). In order to obtain stable dispersions or emulsions, suitable surfactants or emulsifiers must be used. Fluorinated surfactants are commonly used because they produce stable particles and high molecular weight fluoropolymers. However, fluorinated surfactants such as ammonium salts of perfluorooctanoic acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/05
CPCC08F214/22C08K5/06C08L27/16C08F14/18C08L71/02C08F2/30C08F2/20C08L27/12C08L2666/14
Inventor R·阿明-萨纳伊M·杜拉利P·卡普勒G·伯奇
Owner ARKEMA FRANCE SA