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A process for producing ultrathin solid membranes from a solvent solution of an addition polymer derived from an ethylenically unsaturated hydrocarbon monomer or a conjugated unsaturated hydrocarbon monomer in a solvent composed mainly of a volatile, substantially water-immiscible organic liquid med

A process for producing ultrathin solid membranes from a solvent solution of an addition polymer derived from an ethylenically unsaturated hydrocarbon monomer or a conjugated unsaturated hydrocarbon monomer in a solvent composed mainly of a volatile, substantially water-immiscible organic liquid medium capable of dissolving the addition polymer and another organic compound having a distribution coefficient k, which is the ratio of the concentration of the other organic compound in the organic liquid medium to that in water, of from 0.5 to 35. The solvent satisfies the equation c1-(a1+b1)≥25 wherein c1 is the surface tension (dynes/cm) of water, a1 is the surface tension (dynes/cm) of the solution of the addition polymer in the solvent, and b1 is the interfacial tension (dynes/cm) between the solvent solution and water. The solvent solution of the addition polymer is allowed to spread spontaneously on the surface of a liquid support consisting substantially of water whereby the solvent in the solvent solution is removed to an amount sufficient to form a solid membrane on the surface of the liquid support. The process may be performed batchwise or continuously. The solid membrane can be used for obtaining a gas having a specified component gas concentrated therein, for example, a gaseous mixture having enriched oxygen gas from a gaseous mixture of two or more gases for example air.

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A process for producing an ultrathin solid membrane, which comprises dissolving an addition polymer derived from at least one monomer having from 2 to 20 carbon atoms and selected from the group consisting of ethylenically unsaturated hydrocarbon monomers and conjugated unsaturated hydrocarbon monom

A process for producing an ultrathin solid membrane, which comprises dissolving an addition polymer derived from at least one monomer having from 2 to 20 carbon atoms and selected from the group consisting of ethylenically unsaturated hydrocarbon monomers and conjugated unsaturated hydrocarbon monomers in a solvent composed mainly of volatile, substantially water-immiscible organic liquid medium capable of dissolving the addition polymer and being selected from the group consisting of a hydrocarbon and a halogenated hydrocarbon, said solvent containing 0.1 to 15% by weight of another organic compound selected from the group consisting of alicyclic alcohols, aromatic alcohols, ketones, aldehydes, carboxylic acids, peroxides, and mixtures thereof, said organic compound having a distribution coefficient k, which is the ratio of the concentration of the other organic compound in the organic liquid medium to that in water, of from 0.5 to 35, and said solvent meeting the following equation c1-(a1+b1)≥25 wherein c1 is the surface tension (dynes/cm) of water, a1 is the surface tension (dynes/cm) of the solution of the addition polymer in the solvent, and b1 is the interfacial tension (dynes/cm) between the solvent solution and water, and thereafter allowing the solvent solution of the addition polymer to spread spontaneously on the surface of a liquid support consisting substantially of water whereby the solvent in the solvent solution is removed to an amount sufficient to form a solid membrane on the surface of the liquid support.