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An ultrathin solid membrane is composed substantially of a silicon-containing copolymer consisting substantially of recurring units derived from a silicon-containing allyl monomer and an ethylenically unsaturated monomer and/or a diene monomer. The ultrathin solid membrane is useful for obtaining a

An ultrathin solid membrane is composed substantially of a silicon-containing copolymer consisting substantially of recurring units derived from a silicon-containing allyl monomer and an ethylenically unsaturated monomer and/or a diene monomer. The ultrathin solid membrane is useful for obtaining a specified gas, such as oxygen, in a concentrated state, from a mixture of two or more gases, such as air.

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An ultrathin solid membrane capable of producing a concentrated gas from a mixture of two or more gases, especially for obtaining an oxygen-enriched gas from a gaseous mixture containing oxygen gas, said solid membrane having a thickness of from about 50 to about 3,000 A and being composed substanti

An ultrathin solid membrane capable of producing a concentrated gas from a mixture of two or more gases, especially for obtaining an oxygen-enriched gas from a gaseous mixture containing oxygen gas, said solid membrane having a thickness of from about 50 to about 3,000 A and being composed substantially of a film-forming silicon-containing copolymer consisting substantially of (a) at least one recurring unit of the following formula [Figure](I) wherein R1, R2 and R3 are identical or different, and each represents an alkyl group having 1 to 10 carbon atoms, or a phenyl group which may be substituted by an alkyl group having 1 to 4 carbon atoms, and (b) at least one additional recurring unit selected from recurring units of the formula (II-1) and (II-2): [Figure] (II-1) wherein R4 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and R5 represents a hydrogen atom, an alkyl or alkenyl group having 1 to 20 carbon atoms, or a phenyl group which may be substituted by an alkyl group having 1 to 4 carbon atoms; and [Figure] (II-2) wherein R6 and R7 are identical or different, and each represents a hydrogen atom, a chlorine atom, or a methyl group, the proportion of said recurring unit of formula (I) being about 5 to about 95 mole% based on the total recurring units of the silicon-containing copolymer and said silicon-containing copolymer having an inherent viscosity, measured at 25°C. for a solution of 0.5 g of the copolymer in 100 cc of cyclohexane, of about 0.5 to about 4.0. The solid membrane of claim 1 which is carried on a porous sheet-like material. A composite film membrane comprising a porous sheet-like material supporting thereon a laminate of the ultrathin solid membrane of claim 1 and another solid membrane able to separate gases, said laminate having a total thickness in the range of about 50 to about 5,000 A.