Abstract: Provided is an air permeation resistant film in which flexibility can be imparted to the film without remarkably increasing the proportion of a rubber constituting a dispersed phase. An air permeation resistant film comprising (A) a thermoplastic polyester elastomer which comprises a block copolymer containing a polyester as a hard segment and has a melting point of from 180 to 230° C., and (B) a rubber, in a mass ratio (A)/(B) of from 90/10 to 40/60, wherein the component (A) and the component (B) are melt-kneaded to perform dynamic crosslink, thereby forming a continuous phase composed of the component (A) and a dispersed phase composed of the component (B), and the film has an air permeation coefficient at 80° C. of 5×1013 fm2/Pa·s or less and Young's modulus of 120 MPa or less.

Abstract: Provided is an acidic gas-containing gas treatment separation membrane in which an intermediate layer provided on a support member is optimized, and which can treat and separate a gas mixture containing acidic gas and methane gas and/or nitrogen gas into the gas components, and thereby efficiently obtain acidic gas or methane gas and/or nitrogen gas. The acidic gas-containing gas treatment separation membrane includes an inorganic porous support member, an intermediate layer containing a polysiloxane network structure material and formed on a surface of the inorganic porous support member, and a separation layer containing a hydrocarbon group-containing polysiloxane network structure material and formed on the intermediate layer.

Abstract: Provided is an oxygen enrichment membrane that has both good oxygen separation performance and good membrane physical properties (mechanical strength, ease of membrane formation, etc.), and moreover, can be used to industrially obtain a high concentration of oxygen, and a method for producing the oxygen enrichment membrane. The oxygen enrichment membrane includes, as a main component, a hydrocarbon group-containing polysiloxane network structure material which is a reaction product of a tetraalkoxysilane and a hydrocarbon group-containing dialkoxysilane. The tetraalkoxysilane is a tetramethoxysilane or a tetraethoxysilane (referred to as “A”), and the hydrocarbon group-containing dialkoxysilane is dimethyldimethoxysilane or diethyldiethoxysilane (referred to as “B”). The mixing ratio (A/B) of the A and the B as expressed in a molar ratio is 1/9-9/1.

Abstract: An acid gas-containing gas treatment separation membrane is provided which can separate acid gas, such as carbon dioxide, etc., or methane gas from biogas containing acid gas and methane gas, to obtain a gas having a high methane concentration. The acid gas-containing gas treatment separation membrane includes a polysiloxane network structure having an introduced hydrocarbon group, in which unreacted residual groups present on a surface of the polysiloxane network structure have been eliminated or reduced by reaction with at least one modifying silane compound selected from the group consisting of hydrocarbon group-containing monoalkoxysilanes, hydrocarbon group-containing dialkoxysilanes, hydrocarbon group-containing monochlorosilanes, hydrocarbon group-containing dichlorosilanes, and hydrocarbon group-containing trichlorosilanes.

Abstract: An acidic gas-containing gas treatment separation membrane is provided which is capable of separating acidic gas or methane gas from biogas containing acidic gas, such as carbon dioxide or the like, and methane gas to obtain a gas having a high methane concentration. The acidic gas-containing gas treatment separation membrane includes a polysiloxane network structure having an introduced hydrocarbon group, doped with a metal salt having affinity for acidic gas. The polysiloxane network structure having the introduced hydrocarbon group is a composite polysiloxane network structure obtained by a reaction of a tetraalkoxysilane with a trialkoxysilane containing the hydrocarbon group. The tetraalkoxysilane is tetramethoxysilane or tetraethoxysilane. The trialkoxysilane containing the hydrocarbon group is trimethoxysilane or triethoxysilane whose Si atom is bonded with an alkyl or phenyl group having 1-6 carbon atoms.

Abstract: The present invention discloses a process for producing a membrane for separating methane or carbon dioxide, having excellent heat resistance, durability and anti-chemical agent resistance (anti-corrosion resistance). The present invention is related to a process for producing a membrane for separating methane or carbon dioxide, which comprises the following steps: (a) preparing a metal alkoxide solution by (i) mixing an acid catalyst, water and an organic solvent, (ii) adding thereto tetraalkoxysilane and mixing, and (iii) then adding thereto a hydrocarbon group-containing trialkoxysilane, of which a hydrocarbon group is selected from the group consisting of an alkyl group having 1 to 6 carbon atoms and a phenyl group, and mixing, (b) applying the metal alkoxide solution on an inorganic porous support, and then (c) calcining the inorganic porous support having metal alkoxide solution layer at a temperature of 30 to 300° C.

Abstract: Provided is an air permeation resistant film in which flexibility can be imparted to the film without remarkably increasing the proportion of a rubber constituting a dispersed phase. An air permeation resistant film comprising (A) a thermoplastic polyester elastomer which comprises a block copolymer containing a polyester as a hard segment and has a melting point of from 180 to 230° C., and (B) a rubber, in a mass ratio (A)/(B) of from 90/10 to 40/60, wherein the component (A) and the component (B) are melt-kneaded to perform dynamic crosslink, thereby forming a continuous phase composed of the component (A) and a dispersed phase composed of the component (B), and the film has an air permeation coefficient at 80° C. of 5×1013 fm2/Pa·s or less and Young's modulus of 120 MPa or less.

Abstract: The present invention discloses a process for producing a membrane for separating methane or carbon dioxide, having excellent heat resistance, durability and anti-chemical agent resistance (anti-corrosion resistance). The present invention is related to a process for producing a membrane for separating methane or carbon dioxide, which comprises the following steps: (a) preparing a metal alkoxide solution by (i) mixing an acid catalyst, water and an organic solvent, (ii) adding thereto tetraalkoxysilane and mixing, and (iii) then adding thereto a hydrocarbon group-containing trialkoxysilane, of which a hydrocarbon group is selected from the group consisting of an alkyl group having 1 to 6 carbon atoms and a phenyl group, and mixing, (b) applying the metal alkoxide solution on an inorganic porous support, and then (c) calcining the inorganic porous support having metal alkoxide solution layer at a temperature of 30 to 300° C.