High stability polytetrafluoroethylene dispersions and...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 3/05 (2006.01) C08J 3/07 (2006.01) C08L 27/18 (2006.01)

Patent

CA 2537351

A process for stabilizing aqueous dispersions of polytetrafluoroethylene (PTFE) or co- and terpolymers of PTFE by adding a macromolecular species directly to the aqueous dispersion. Surprisingly, it has been observed that after the macromolecular species has been added to the dispersion of PTFE or co- and terpolymers of PTFE, the dispersions are very stable, do not readily coagulate, and remain stable even when subjected to freeze/melt cycles. The amount of macromolecular species which may be added may vary from about 0. 1 wt. % to about 20.0 wt. %, for example, and suitable macromolecular species include polyacrylic acid (PAA), polyvinylalcohol (PVOH), polyethyleneimies (PEI), and polyethylene glycol (PEG), and others. The present method is particularly effective for stabilizing commercially available ~unstabilized~ aqueous dispersions of PTFE or co- and terpolymers of PTFE which do not include a surfactant or are substantially free of surfactant.

L'invention porte sur un procédé de stabilisation de dispersions aqueuses de polytetrafluoroéthylène (PTFE) ou de copolymères et terpolymères de PTFE par ajout d'une espèce macromoléculaire directement dans la dispersion aqueuse. Curieusement, il a été observé que, après l'ajout des espèces macromoléculaires dans la dispersion de PTFE ou de copolymères ou terpolymères de PTFE, les dispersions sont très stables, ne coagulent pas rapidement, et restent stables même lorsqu'elles sont soumises à des cycles de congélation/fusion. La quantité d'espèces macromoléculaires pouvant être ajoutées est comprise entre 0,1 % et 20 % en poids environ par exemple, et les espèces macromoléculaires convenables contiennent de l'acide polyacrylique (PAA), de l'alcool polyvinylique (PVOH), des polyéthylèneimines (PEI), et du glycol de polyéthylène (PEG), ainsi que d'autres éléments. Ce procédé permet de stabiliser de manière efficace des dispersions aqueuses non stabilisées commercialement disponibles de PTFE ou de copolymères ou terpolymères de PTEF qui ne contiennent pas ou presque pas d'agent de surface .

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