Patent US2050001A successfully refreshed from Google Patents.
Patent EP0181772A2 successfully refreshed from Google Patents.
EP0181772A2
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EP
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Method of making membranes for gas separation and the composite membranes
Assignee: Research Foundation of the State University of New York
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Filing: 1985-11-08
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Granted: —
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Expires: 2005-11-08
Abstract
Abstract Composite membranes suitable for separating gas mixtures are made by in situ crosslinking of aminoorganofunctional polysiloxane, 1 to 9 mol percent aminosiloxane units, with diisocyanate on the surface of a highly porous polymer substrate, such as polysulfone. Using the crosslinked polysiloxane as a gutter layer, a gas separating entity can be coated on the gutter layer to make a double layer composite membrane which has a higher separation factor than the crosslinked polysiloxane and can be used effectively for flat sheet membranes, as well as, hollow fiber membranes.
Inventors
- 👤 Israel Cabasso
- 👤 Kevin Arthur Lundy
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:26
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D53/00; B01D53/22; B01D53/228; B01D67/00; B01D67/0002; B01D67/0006; B01D67/0081; B01D67/0088; B01D71/00; B01D71/06; B01D71/52; B01D71/522; B01D71/5223; B01D71/54; B01D2323/00; B01D2323/12; B01D2323/30; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/25; Y10T428/254
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
A method for making a composite suitable for increasing the oxygen gas content of an oxygen-nitrogen gas mixture by passing the mixture through the composite, consisting essentially of coating an aminoorganofunctional polysiloxane on at least one surface of a 20 to 250 µm thick, highly porous, polymer substrate, where the polysiloxane is applied in a thickness sufficient to provide a cured membrane having a thickness of 0.1 µm to 20 um, the polysiloxane consisting essentially of a random copolymer of from 1 to 9 mol percent aminosiloxane units having primary aminoorganofunctionality and 91 to 99 mol percent other repeating siloxane units contacting the polysiloxane coated on the substrate with a solution of a non-isocyanate-reactive organic solvent 'and diisocyanate for a sufficient time to cause a crosslinked membrane to form, where the weight ratio of the polysiloxane to the diisocyanate is in an inverse relationship to the permeability coefficient of the composite.
Claim 2
Independent Claim
151 words
A method for making a composite suitable for increasing the oxygen gas content of an oxygen-nitrogen gas mixture by passing the mixture through the composite, consisting essentially of coating an aminoorganofunctional polysiloxane on at least one surface of a 20 to 250 µm thick, highly porous, polymer substrate, where the polysiloxane is applied in a thickness sufficient to provide a cured membrane having a thickness of 0.1 µm to 20 um, the polysiloxane consisting essentially of a random copolymer of from 1 to 9 mol percent aminosiloxane units having primary aminoorganofunctionality and 91 to 99 mol percent other repeating siloxane units contacting the polysiloxane coated on the substrate with a solution of a non-isocyanate-reactive organic solvent 'and diisocyanate for a sufficient time to cause a crosslinked membrane to form, where the weight ratio of the polysiloxane to the diisocyanate is in an inverse relationship to the permeability coefficient of the composite.
Claim 3
Dependent Claim
10 words
A composite membrane obtained from the method of claim 1.
Claim 4
Dependent Claim
40 words
A method in accordance with claim 1 in which the product obtained is further processed by contacting the crosslinked membrane with poly(2,6-dimethyl-1,4-phenylene- oxide) in an amount sufficient to provide an ultrathin layer which is effective as a gas selective film.
Claim 5
Dependent Claim
41 words
A method in accordance with claim 1 in which the product obtained is further processed by contacting the crosslinked membrane with a brominated poly(2,6-dimethyl-1,4-phenyleneoxide) in an amount sufficient to provide an ultrathin layer which is effective as a gas selective film.
Claim 6
Dependent Claim
75 words
A double layer composite membrane suitable for separating gases consisting essentially of a 20 to 250 µm thick highly porous polymer substrate having tightly adhered thereto a gutter layer of a highly gas permeable rubber obtained by crosslinking an aminoorganofunctional polysiloxane having from 1 to 9 mol percent primary aminoorganofunctionality bearing siloxane units and 91 to 99 mol percent other siloxane units, and tightly adhered and overcoating the gutter layer is a gas separating entity.
Claim 7
Dependent Claim
75 words
A double layer composite membrane suitable for separating gases consisting essentially of a 20 to 250 µm thick highly porous polymer substrate having tightly adhered thereto a gutter layer of a highly gas permeable rubber obtained by crosslinking an aminoorganofunctional polysiloxane having from 1 to 9 mol percent primary aminoorganofunctionality bearing siloxane units and 91 to 99 mol percent other siloxane units, and tightly adhered and overcoating the gutter layer is a gas separating entity.
Claim 8
Dependent Claim
78 words
The composite membrane according to claim 5 in which the aminoorganofunctional polysiloxane crosslinked is derived from a random terpolymer polysiloxane having two trimethylsiloxy units, 2 to 15,000 dimethylsiloxane units, and 2 to 160 units selected from the general formulae in which R is a divalent radical selected from and the polysiloxane is crosslinked with diisocyanate and the gutter layer is 0.1 to 20 µm thick, the gas separating entity is poly(2,6-dimethyl-1,4-phenyleneoxide) and is less than 2 µm thick.
References Cited (Backward Citations)
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