EP0460769A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Semi-permeable composite membrane and process for manufacturing same
Assignee: X Flow BV
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Filing: 1991-06-06
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Granted: —
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Expires: 2011-06-06
Abstract
Abstract The invention relates to a semi-permeable composite membrane with a porous carrier substrate whereon a polymer network obtained by interfacial polymerisation is applied, said network comprises an additional polymer. According to the present invention said additional polymer is dissolved in the water phase or in the organic phase, from which said interfacial polymerisation occurs, which additional polymer is molecularly entangled in said network and may regulate in particular the selectivity and the permeability of the composite membrane. Preferably the additional polymer is a non-reactive polymer. Furthermore, the invention relates to a process for manufacturing the above-mentioned semi-permeable membrane.
Inventors
- 👤 Dirk Marinus Koenhen
- 👤 Aloysius Henricus Antonius Tinnemans
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:43
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/1251
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
71 words
A semi-permeable composite membrane with a porous carrier substrate whereon a polymer network obtained by interfacial polymerisation is applied, said network comprises an additional polymer, characterized in that said additional polymer is dissolved in the water phase or in the organic phase, from which said interfacial polymerisation occurs, which additional polymer is molecularly entangled in said network and may regulate in particular the selectivity and the permeability of the composite membrane.
Claim 2
Dependent Claim
16 words
A semi-permeable composite membrane of claim 1, characterized in that the polymer is a non-reactive polymer.
Claim 3
Dependent Claim
54 words
A semi-permeable composite membrane of claim 2, characterized in that the non-reactive polymer is a polyalkyl siloxane either branched or not with the formula wherein R and R₁ independent of each other represent a C₁-C₂₀ alkyl or alkyl group either substituted or not and n is an integral of 20-50.000 or a copolymer thereof.
Claim 4
Dependent Claim
22 words
A semi-permeable composite membrane of claim 3, characterized in that the polyalkyl siloxane is a polydimethyl siloxane with terminal trimethyl silyl groups.
Claim 5
Dependent Claim
47 words
A semi-permeable composite membrane of claim 2, characterized in that the non-reactive polymer is a polyacrylate or polymethacrylate with the formula wherein R₂ = H or CH₃ and R₃ an alkyl either branched or not with 1-20 carbon atoms, while n is an integral of ≧ 10.
Claim 6
Dependent Claim
29 words
A semi-permeable composite membrane of claim 2, characterized in that the non-reactive polymer is a polyolefine either branched or not chosen from the group of polyisobutylene, polyisoprene or polybutadiene.
Claim 7
Dependent Claim
22 words
A semi-permeable composite membrane of claim 2, characterized in that the non-reactive polymer is a block copolymer of styrene-butadiene-styrene, styrene-isoprene-styrene, styrene-ethylene-butylene-styrene etc.
Claim 8
Dependent Claim
16 words
A semi-permeable composite membrane of claim 2, characterized in that the non-reactive polymer is cellulose acetate.
Claim 9
Dependent Claim
35 words
A semi-permeable composite membrane of claim 2, characterized in that the non-reactive polymer is a polyalkylene oxide, in particular polyethylene oxide with the formula (CH₂-CH₂-O) n , wherein n is an integral of ≧ 20.
Claim 10
Dependent Claim
46 words
A semi-permeable composite membrane of claims 1-9, characterized in that the polymer regulating the membrane properties is present in the polymer network in a quantity of 5-90%, by weight, and preferably in a quantity of 10-60%, by weight, related to the total weight of the network.
Claim 11
Dependent Claim
207 words
A process for manufacturing a semi-permeable membrane by coating a porous substrate with a polymer network obtained by interfacial polymerisation, characterized in that the porous substrate is treated with a solution of at least one reactive polyfunctional monomer or oligomer or prepolymer with as reactive groups -NHR₄ (R₄ = H or alkyl with C₁-C₂₀), -OH or -SH and eventually a surfactant in water, whereafter the so treated substrate is further treated with a solution of at least one reactive polyfunctional monomer or oligomer or prepolymer or polymer with as reactive groups -COX, -SO₂X, -POXR₅, -NR₆COX or -NCO, wherein X = Cl, Br or I, wherein R₅ and R₆ represent an alkoxy group or alkyl group with 1-16 carbon atoms, preferably 1-5 carbon atoms, in a suitable organic solvent, wherein a polymer regulating the membrane properties according to claims 1-10 prior to the treatment of the substrate with the aqueous solution of the said reactive components is added to that solution in case the polymer is soluble in water, whereas in case the polymer solves in an organic solvent, this is added to the organic solution of said reactive components, whereafter the so treated substrate is dried and is or is not subjected to a heat treatment, subsequently.
Claim 12
Dependent Claim
11 words
A semi-permeable composite membrane obtained by the process of claim 11.
References Cited (Backward Citations)
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