The Dow Chemical Company

Terry D Gordon

Charles W Martin

Stan H Baker

Melisa Davila

Marinda L Wu

John P McGraw

Paul R Peters

Non-evaporative processes for coating ion-containing polymers onto selected substrates and the articles made thereby, which processes fundamentally comprise contacting a substrate with a dispersion or solution of an ion-containing polymer and especially a solventless dispersion of a perfluorosulfonic acid ionomer, and thereafter contacting the dispersion- or solution-wetted substrate with a solution of a salt or of a strongly ionizing acid of a sufficient concentration to cause an adherent coating of the ion-containing polymer to be formed on the substrate.

Processes for forming thin, durable coatings of cation-containing

A novel, improved process for forming a thin, adherent coating of a perfluorocarbon ionomer on a polymeric substrate which is typically in powdered form, fibrous form, or a mixture of powdered and fibrous forms, from a colloidal dispersion of the perfluorocarbon ionomer in a liquid medium which consists essentially of water and is substantially free of organic solvents, comprising adding a) the colloidal dispersion and b) a salt or a strongly ionizing acid to a vessel containing the polymeric substrate, and subjecting the dispersion, salt or acid and polymeric material to high shear conditions whereby a thin, durable coating of the perfluorocarbon ionomer is formed on the polymeric substrate.

Solventless process for forming thin, durable coatings of

The invention relates to a process of separating gases using a membrane fabricated from a polymer containing a perfluorinated backbone and pendant hydrated metal ionomer groups wherein the pendant hydrated metal ionomer groups contain cations of alkali metals, alkaline earth metals, or transition metals bound to SO.sub.3.sup.-. The hydrated membranes have improved gas permeabilities with comparable gas selectivities over the unhydrated membranes. The membranes may be used to separate gas mixtures containing such gases as carbon dioxide and methane.

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Angleton, TX, United States of America

Terry D Gordon