Processes for forming thin, durable coatings of...

C - Chemistry – Metallurgy – 08 – J

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C08J 7/04 (2006.01) C08J 5/22 (2006.01) C25B 13/04 (2006.01) C25B 13/08 (2006.01)

Patent

CA 2231142

An improved process for forming a thin, durable coating of a perfluorosulfonated, salt- or acid-form ionomer on a selected substrate, which comprises contacting the substrate with an aqueous, surface active dispersion of the thermoplastic, sulfonyl fluoride precursor of the perfluorosulfonated, salt- or acid-form ionomer, contacting the dispersion-wetted substrate with a salt solution or a strongly ionizing acid solution of a sufficient ionic strength to cause a thin, adherent coating of the precursor particles in said dispersion to be formed on the substrate, then removing excess dispersion and excess salt or acid solution, annealing the coated substrate at an elevated temperature and thereafter converting the precursor to the desired acid or salt form ionomer.

Procédé amélioré de formation d'une couche mince et durable d'ionomère perfluorosulfoné, sous forme sel ou acide, sur un substrat choisi, consistant à mettre le substrat en contact avec une dispersion aqueuse, tensioactive du précurseur sulfonyl fluorure thermoplastique du ionomère perfluorosulfoné sous forme sel ou acide, à mettre le substrat mouillé à l'aide de la dispersion en contact avec un solution saline ou une solution acide fortement ionisante de force ionique suffisante pour provoquer la formation d'une couche fine, adhésive de particules de précurseur de ladite dispersion sur le substrat, puis à retirer l'excès de dispersion et l'excès de sel ou de solution acide, à recuire le substrat revêtu à une température élevée et enfin à convertir le précurseur pour obtenir l'ionomère voulu sous forme acide ou sel.

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