Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
  • B01D67/0081—After-treatment of organic or inorganic membranes
  • B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
  • B01D67/0081—After-treatment of organic or inorganic membranes
  • B01D67/0093—Chemical modification
  • B01D67/00931—Chemical modification by introduction of specific groups after membrane formation, e.g. by grafting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
  • B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
  • B01D69/12—Composite membranes; Ultra-thin membranes
  • B01D69/125—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
  • B01D71/06—Organic material
  • B01D71/08—Polysaccharides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
  • B01D71/06—Organic material
  • B01D71/08—Polysaccharides
  • B01D71/12—Cellulose derivatives
  • B01D71/22—Cellulose ethers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
  • B01D71/06—Organic material
  • B01D71/38—Polyalkenylalcohols; Polyalkenylesters; Polyalkenylethers; Polyalkenylaldehydes; Polyalkenylketones; Polyalkenylacetals; Polyalkenylketals
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
  • B01D71/06—Organic material
  • B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
  • B01D71/68—Polysulfones; Polyethersulfones
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
  • B05D3/068—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using ionising radiations (gamma, X, electrons)
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/12—Chemical modification
  • C08J7/123—Treatment by wave energy or particle radiation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2323/00—Details relating to membrane preparation
  • B01D2323/02—Hydrophilization
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2323/00—Details relating to membrane preparation
  • B01D2323/30—Cross-linking
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2323/00—Details relating to membrane preparation
  • B01D2323/34—Use of radiation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2323/00—Details relating to membrane preparation
  • B01D2323/36—Introduction of specific chemical groups
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/249921—Web or sheet containing structurally defined element or component
  • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]

Definitions

• the present invention relates to a process for producing a microporous membrane having fixed on its surface an electron beam cross-linked polymer, comprising providing a microporous starting membrane, impregnating the membrane with an impregnating solution comprising a solvent and a polymer dissolved or dispersed therein to provide an impregnated membrane, and to irradiate the impregnated membrane with electron radiation to provide a microporous membrane having on its surface the electron beam cross-linked polymer fixed, and a microporous membrane produced by this method and the use of such a membrane.
• the filter material is mechanically stable, thermally and chemically resistant, and insoluble in common (organic) solvents.
• polymers are frequently used as filter materials whose surface properties, such as wettability with water or unspecific binding (eg of proteins), do not meet the requirements in later use.
• Modification is a simple impregnation of the membrane with a solution such as a hydrophilic polymer (for a hydrophilization of a hydrophobic polymer membrane) out of the question, since this hydrophilic polymer can be easily washed back from the membrane.
• U.S. Patent 4,698,388 discloses polymeric materials coatable with a block copolymer preparable from two grades of vinyl monomers in the presence of a polymeric peroxide wherein the polymer of one of the two grades of vinyl monomers is homogeneously dispersible in the polymeric materials and the other type forms hydrophilic homopolymers , The durability of the hydrophilic modification, e.g. B.
• US-A-2003/148017 discloses the modification of hydrophobic poly (ether) sulfone-based dialysis membranes by adsorption of copolymers with hydrophobic polypropylene oxide (PPO) segments and with hydrophilic polyethylene oxide (PEO) segments, washing them from the membrane into the membrane Dialysate solution in hemodialysis harmless in sterile filtration but is undesirable.
• PPO polypropylene oxide
• PEO polyethylene oxide
• US Pat. No. 4,618,533 proposes porous, hydrophobic raw membranes based on poly (ether) sulfone or polyvinylidene fluoride with a solution of a monomer (hydroxyalkyl or aminoalkyl acrylate). and an initiator, and then initiate polymerization of the monomer by energization, e.g. By heating (thermal initiation) or UV irradiation (using a photoinitiator). The polymerization forms long-chain, crosslinked polymer chains in the interior of the porous matrix which can not be washed by the membrane and are partially grafted onto the membrane, resulting in permanent modification.
• U.S. Patent 5,629,084 discloses impregnation of base membranes of polyvinylidene difluoride, polytetrafluoroethene, polyethene and polypropene with a solution of prepolymers using a polymerization initiating radical initiator.
• a crosslinker is not used and the crosslinking of the prepolymers based on polyvinyl alcohols, polyvinylamines, polyacrylic acids and polyvinylpyrrolidone and their grafting to the membrane surface are initiated by energy supply, namely heat in thermal initiators or UV irradiation in photoinitiators.
• energy supply namely heat in thermal initiators or UV irradiation in photoinitiators.
• a disadvantage of this method is the use of initiators peroxide and persulfate, which are used in considerable proportions between 10 and 30 weight percent during manufacture, since these and their degradation products (alkali sulfates, phosphates and benzoic acid derivatives) after modification of the modified membrane material must be removed by extraction as waste.
• the production method is limited to heat energy and ultraviolet radiation as kinds of radiation because electron beam irradiation destroys the base membrane material, and thus no modification is achieved (see column 3, lines 53 to 56, of U.S. Patent 5,629,084).
• This finding from the prior art is supported by the fact that in all embodiments, the modification of the starting membrane with crosslinking of the prepolymer is carried out only under heat or under UV irradiation, which involves the use of a radical or photoinitiator necessary (see “Examples 1-11", of US Patent 5,629,084).
• an alternative to the use of initiators is the initiation of the polymerization by electron beams.
• the membrane to be modified is impregnated with a solution containing reactive organic molecules, such as. B. derived from acrylic acid derivatives monomers, and then exposed to electron beam, which initiates the reaction of the monomers.
• reactive organic molecules such as. B. derived from acrylic acid derivatives monomers
• electron beam which initiates the reaction of the monomers.
• this process is described in US Patent 4,944,879, EP-B-1 390 087, EP-B-1 381 447 and US Patent 7,067,058.
• the described impregnation solutions often also contain crosslinkers, i. H.
• the variants of the thermally induced modification with a homopolymer and a crosslinker (WO-A-2005/077500) or with an oligomer, with a monomer and optionally with a crosslinker employ hazardous low molecular weight, organic compounds, wherein US Patent 6,039,872 hydrophilic Discloses membranes which can be prepared from a hydrophobic poly (ether) sulfone membrane and a crosslinkable polyalkylene glycol diacrylate and a hydrophilic monoacrylate.
• the processes described are complex and cost-intensive.
• the present invention is therefore based on the object to provide a microporous membrane which has a permanent modification on its surface, and contains no extractable, toxic components, and to provide an environmentally friendly process for their preparation, which is based on the use of toxicologically harmful starting materials and toxic process-initiating Substances omitted.
• a process for producing a microporous membrane having fixed on its surface an electron beam cross-linked polymer comprising the steps of: a) providing a starting microporous membrane, b) impregnating the membrane with an impregnating solution comprising a solvent and a polymer dissolved or dispersed therein to provide an impregnated membrane, and c) irradiating the impregnated membrane with electron radiation to form a microporous membrane on the surface of which
• Electron radiation crosslinked polymer is fixed to provide.
• the microporous membrane understood a membrane having pores in the micrometer range.
• the microporous starting membrane has an average pore size in the range of 0.001 to 10 microns.
• the starting microporous membrane may be made of any suitable material.
• Corresponding microporous membranes are known in the art.
• the starting microporous membrane is a material selected from the group consisting of polysulfone, polyethersulfone, cellulose acetate, cellulose nitrate, polyvinylidene fluoride, polypropene, polyethene, polytetrafluoroethene, polyamide, copolymers of these, and mixtures thereof.
• the thickness of the starting membrane is in the range from 5 to 500 ⁇ m, more preferably in the range from 50 to 300 ⁇ m and most preferably in the range from 80 to 200 ⁇ m.
• step b) of the process according to the invention After providing the previously described microporous starting membrane (step a) of the process according to the invention, the impregnation of the membrane with an impregnating solution comprising a solvent and a polymer dissolved or dispersed therein is carried out in step b) to provide an impregnated membrane.
• impregnation means all possible forms of contacting the substantially entire surface of the starting membrane with the polymer.
• the impregnation is carried out by immersing the starting membrane in the impregnating solution or by spraying the starting membrane with the impregnating solution, optionally followed by removing an excess of the impregnating solution from the outer surfaces of the membrane. If it is advantageous for the impregnation process, wetting a dry starting membrane first with a liquid suitable for wetting take place, which is replaced in a second step against the impregnating solution.
• the surface of the starting membrane is understood as meaning both the inner surface, ie the pore inner wall surfaces, and the outer surface, ie the outer surfaces of the membrane.
• the solvent of the impregnating solution may be any suitable solvent. However, it is preferred that such a solvent be selected in which the polymer is indeed soluble or dispersible, but which does not attack or dissolve the starting membrane. In addition, the solvent is preferably selected so as not to interfere with the crosslinking reaction. The swelling behavior of the starting membrane in the solvent should be taken into account when choosing the solvent.
• a solvent selected from the group consisting of water, alcohols, ketones, hydrofluoroethers and mixtures thereof is used. Suitable alcohols are, for example, methanol, ethanol, propanol, so-propanol and butanol.
• a suitable ketone is, for example, acetone. Particular preference is given to using water or a mixture of water and butanol as the solvent. In particular, by the use of water as a solvent, the environmental friendliness and cost-effectiveness of the method according to the invention can be increased.
• the polymer is dissolved or dispersed in an appropriate amount.
• membranes with variably adjustable permeabilities can be produced by the process according to the invention. It is particularly preferred that the permeability of the treatment is reduced by not more than 90%, more preferably not more than 50%, and most preferably not more than 10%.
• permeability is understood to mean the volume flow of water at 20 ° C. normalized by differential pressure and membrane area, which is expressed in liters / (hour * square meter). bar).
• the impregnating solution contains from 0.01 to 20% by weight of the polymer. Particularly preferably, the impregnating solution contains from 0.2 to 5% by weight of the polymer.
• the impregnation is usually carried out for a time sufficient to cover the substantially complete surface of the starting membrane.
• the impregnation is carried out for a period of 0.05 to 10 minutes, more preferably from 0.1 to 1 minute.
• the impregnation time is preferably less than one minute, and in the case of diffusive impregnation, the impregnation time is preferably in the range from two to 10 minutes.
• the rate-determining step is then determined virtually only by the association constant between the starting membrane and the polymer in the impregnating solution.
• diffusive impregnation an impregnation is to be understood below, in which a diffusion limitation of the mass transfer of the polymer present in the impregnating solution into the pores of the starting membrane occurs. Diffusion limitation is that the rate of the adsorption process is determined by the rate of diffusion of the polymer into the pores. The diffusion rate is in turn determined by the diffusion coefficient of the polymer, which depends very much on its size, or its molecular weight.
• the polymer used for impregnation can be selected according to the respective desired surface properties of the microporous membrane to be obtained. If a hydrophilized membrane surface is desired, then a hydrophilic polymer should be used for modification. Becomes whereas a hydrophobized membrane surface is desired, a hydrophobic polymer should be used for modification.
• the hydrophilicity or hydrophobicity of the polymer also depends on the choice of solvent.
• the modification polymers which either already carry charges or have functional groups which can be converted chemically or physically into cationic or anionic groups.
• these polymers contain, for example, amine functions of different degrees of substitution, carboxyl or sulfonic acid groups or ester or amide functions.
• a polymer is understood as meaning an organic substance which has an average molar mass of at least 500 g / mol and can be prepared from at least one kind of organic starting monomer.
• a polymer selected from the group consisting of a copolymer, a homopolymer, and mixtures thereof is used for the impregnation.
• Particular preference is given to using a polymer which consists of the group consisting of poly (2-ethyloxazoline), polyethylene oxide (PEO), polypropylene oxide (PPO), hydroxyethylcellulose, dextran, hydroxymethylcellulose, PEO-PPO-PEO triblock copolymers, and
• PEO-PPO-PEO triblock copolymer is especially PLURONICS ® from BASF AG, CAS-No. 9003-11-6, with the general composition (PEO) b - (PPO) a - (PEO) b being preferred, the indices a and b being in the range from 3-80.
• a polymer derived from the group of perfluorinated hydrocarbons, charged polymers or chelating polymers is used to modify the starting membrane.
• step c) of the method according to the invention the irradiation of the impregnated membrane is then carried out with electron radiation, around a microporous membrane, on the surface of which by electron radiation crosslinked polymer is fixed to provide.
• Irradiation according to the process of the present invention produces a crosslinked reaction product which is a three-dimensional network formed from the starting membrane and the polymer and which forms on substantially the entire inner and outer surfaces of the resulting membrane. This reaction product is permanently fixed on the membrane obtainable by the process according to the invention.
• fixation means any covalent and noncovalent attachment of the crosslinked polymer over the entire membrane surface, such as the grafting or application of a polymer layer, which lines the entire membrane surface as a coherent network, without the polymer layer in turn must be grafted onto the membrane surface.
• the irradiation is usually carried out with an absorbed dose, which is sufficient to fix the polymer on the surface of the membrane.
• the kinetic energy of the electrons used for the modification can be adjusted via the acceleration voltage of the electron beam source so that the energy dose of the radiation is homogeneously distributed over the permeated membrane or that a gradient is produced in the cross section of the membrane.
• the electron irradiation is carried out at a dose of 1 to 300 kGy, more preferably with an absorbed dose of 5 to 200 kGy.
• electron irradiation occurs at a dose of 25 to 150 kGy. It has been shown that, when the parameters of the electron beam are adapted to the individual material properties of the starting membrane, a permanent modification is possible without any prior decomposition of the starting membrane. It has thus surprisingly been found that it is possible, contrary to the findings of US Patent 5,629,084, a permanent modification of a microporous To achieve output membrane by a producible by electron radiation reaction product of a polymer without a prior decomposition of the output membrane by the electron beam occurs.
• the reaction process during the irradiation can be influenced by the presence of reactive substances, such as oxygen.
• reactive substances such as oxygen.
• nitrogen or noble gases and reactive gases, such as oxygen the composition of the ambient atmosphere during the irradiation can be adjusted.
• Another way to adjust the atmospheric conditions during irradiation is to cover the membrane with suitable films that severely limit the diffusion of gases in the process zone into the impregnated membrane.
• the irradiation can be carried out with a single layer or with a multi-layered package of membranes, wherein the penetration depth of the electrons can be adjusted by the acceleration voltage used.
• the process of the invention may further comprise the step of d) pre-treating the microporous starting membrane with a pre-wetting medium.
• a pre-wetting medium is selected from the group consisting of alcohols, ketones, hydrofluoroethers, hydrocarbons, and combinations thereof.
• Suitable alcohols are, for example, methanol, ethanol, propanol, so-propanol and butanol.
• a suitable ketone is, for example, acetone.
• the method further comprises the steps e) of extracting the microporous membrane, on the surface of which an electron beam crosslinked polymer is fixed, with an extractant, to provide an extracted membrane, and f) drying the extracted membrane.
• the extractant does not dissolve the material of the finished membrane, whereas the unreacted polymer, cross-linked polymer not fixed on the membrane and solvent residues from step b) are dissolved by the extractant.
• the swelling behavior of the membrane present in step c) in the extractant should be taken into account in the selection of the extractant.
• the extractant is selected from the group consisting of water, aqueous acids, aqueous alkalis, alcohols, ketones, and combinations thereof.
• Suitable alcohols are, for example, methanol, ethanol, propanol, so-propanol and butanol.
• a suitable ketone is, for example, acetone.
• the drying of the extracted membrane is preferably carried out for a period of 6 seconds to 120 minutes at a temperature in the range of 60 to 19O 0 C. In this way it is possible to remove the solvent from the membrane in a relatively short time and so a usable to obtain modified membrane.
• the substantially entire surface of the porous starting membrane ie including the pore inner wall surfaces
• the polymer used for the modification is coated with the polymer used for the modification.
• the inner and outer surfaces of the membrane are modified so that the permeability is not reduced more than 90%, preferably not more than 50%, and most preferably not more than 10%.
• the polymer used for the modification is not formed in situ, that is not applied in the form of monomer units on the surface of the starting membrane and polymerized by the electron beam irradiation. Rather, the polymer is contacted in solution with the starting membrane and then exposed to electron radiation. Thus, the polymer is the educt for the on the output membrane by electron radiation permanently fixed and crosslinked reaction product, alone or in synergy with the starting membrane, the hydrophilic or hydrophobic properties of the inventive Process prepared membrane determined.
• the inventive method has the further advantage that only the impregnation and a single-stage irradiation are necessary to obtain a modified membrane.
• the present invention further relates to a microporous membrane on the surface of which a polymer crosslinked by electron beam radiation is fixed, and which is produced by the method according to the invention shown above.
• the present invention relates to the use of this microporous membrane as a membrane filter in hemodialysis, virus filtration and / or in the sterile filtration of gases and liquids.
• the permeability of the membrane is the normalized to differential pressure and area flow through the membrane.
• the permeability of water at 20 ° C. through the membrane in liters / (hour • square meter * bar) is given.
• BCA Reagent Use Solution from BCA Reagent A (0.886% by weight 2,2'-biquinoline-4,4 1 -dicarboxylic acid (bicinchoninic acid), 0.16% by weight disodium tartrate, 2% by weight % Of sodium carbonate [anhydrous] 0.95% by weight of sodium hydrogencarbonate in reverse osmosis water) and BCA reagent B (4% by weight of CuSO 4 solution in reverse osmosis water) in the ratio of 50: 1 immediately before Use mixed, treated.
• the intensity of discoloration of the solution standing above the die was evaluated as absorbance at 595 nm with a photometer.
• the concentration of membrane-bound ⁇ ⁇ globulin was determined as an interpolation of a standard series according to D. Burns, A. Zydney, "Effect of Solution pH on Protein Transport through UF Membranes", Biotechnology and Bioengineering, Vol. 64, No. 1, 1999, p. 27-37, determined.
• the starting membrane having a thickness in the range of 5 to 500 microns was wetted with a solution of the polymer used for the modification by impregnation for 0.05 to 10 minutes, wherein the concentration of the polymer in the solution in the range of 0.01 to 20 weight percent , If the membrane material was not spontaneously wetted by this impregnation solution, pre-wetting was optionally carried out with a suitable solution which spontaneously wet the starting membrane material. Subsequently, the replacement of this Vorbeetzungsmediums took place by the impregnation solution.
• the membrane After contacting the membrane with the impregnating solution, the membrane was placed between two polyethene (PE) films and excess impregnating solution was displaced with a roller from the membrane or squeezed between two rubberized rollers. Subsequently, the impregnated membrane was exposed to electron beam radiation (ESI Electrocurtain) using acceleration voltages between 150 to 240 kV and doses of 1 to 300 kGy. The transport speed at which the material to be irradiated was conveyed through the irradiation zone ranged from 1 to 100 m / min. The irradiation zone was rendered inert with nitrogen. After irradiation, the membrane was extracted with appropriate solvents to dissolve unreacted molecules of the polymer used for modification. Subsequently, the modified membrane was dried in a drying oven and examined for their properties.
• PE polyethene
• the properties of the modified membranes were investigated after different impregnations ("impregnation”) and after exposure to different doses of irradiation (dose in kGy).
• Membrane properties were measured by drop wicking time (TASZ in s), drop wicking time after Soxhlet extraction (TASZsox in s), permeability of water at 20 C C (flow in l (liter) per m 2 membrane area in 1 hour (h ) at 1 bar differential pressure) and by the non-specific protein binding of y-globulin ("Prot.Bind” in ⁇ g protein per cm 2 membrane area).
• the nonspecific protein binding and the surface tension were determined as described under "Methods of Characterization”.
• the permanent fixation in the membranes obtained by the process of the invention was detected by Soxhlet extraction.
• the reaction product fixed on the microporous membrane is crosslinked by treating the membrane obtained by the method of the present invention with dichloromethane.
• the insoluble residue obtained as the gel phase functional units of the polymer used for the modification were detected by means of NMR and IR spectroscopy.
• the starting membranes were completely soluble in dichloromethane.
• polymer poly (2-ethyl oxazoline) (Aquazol ® 5) was used, which is a hydrophilic homopolymer from Polymer Chemistry Innovations having a molecular weight of 5000 g / mol and a polydispersity 3 to 4
• the impregnation was carried out with a solution of Aquazol ® 5 in reverse osmosis (RO) water containing 0.5 weight percent of the homopolymer.
• RO reverse osmosis
• the membrane of type 15407 was prepared according to the procedure described above under "General description of the procedure" (dose 75 kGy (equivalent to 75 kJ / kg)) modified and exhibited the properties listed in Table 1 after extraction with isopropanol (IPA) and water.
• the reference membrane was extracted with only IPA and water without first being treated with impregnating solution and / or electron beam radiation; Another reference membrane was irradiated with water after impregnation and then extracted with IPA and water:
• the modified membrane has a significantly reduced TASZ compared to the reference membranes, especially after 72-hour Soxhlet extraction with ethanol.
• the electron-beam-induced modification of the starting membrane permanently hydrophilizes it after impregnation with an aqueous solution of poly (2-ethyloxazoline), without any previous decomposition of the starting membrane.
• the non-specific protein binding of the membrane is drastically reduced by this modification. The flow is only slightly changed by the modification.
• the impregnation of the starting membrane of the type 15407 was performed with a solution of Pluriol ® 4000, available (from BASF polyethylene glycol having an average molecular weight of 4000 g / mol) in reverse osmosis (RO) water containing 1.0 percent by weight of the homopolymer.
• the membrane was modified according to the procedure described above under "General Description of Procedure" (dose 75 kGy (equivalent to 75 kJ / kg) and, after extraction with isopropanol (IPA) and water, had the properties listed in Table 2.
• the reference membrane only became extracted with IPA and water without first being treated with impregnating solution and / or electron beam radiation, another reference membrane was impregnated with water after impregnation and then extracted with IPA and water:
• the modified membrane has a significantly increased surface tension compared to the reference membranes, especially after a 72-hour Soxhlet extraction with ethanol. Consequently, the starting membrane is permanently hydrophilized by the electron beam induced modification by impregnation with an aqueous solution of Pluriol ® 4000, without prior decomposition of the starting membrane occurs. Furthermore, the nonspecific protein binding of the membrane is drastically reduced by this modification and at the same time the surface tension is drastically increased. The flow is reduced by the modification by 35% or 39% compared to the starting or reference membrane. 3) hydroxyethylcellulose 4000
• the impregnation of the starting membrane of the type 15407 was performed with a solution of hydroxyethyl cellulose, viscosity 4000 uPA * s than 1 -issprozentige solution in water at 2O 0 C, in reverse osmosis (RO) water containing 0.5 weight percent of the homopolymer contained.
• the membrane was modified according to the procedure described above under "General Description of Procedure" (dose 75 kGy (equivalent to 75 kJ / kg) and, after extraction with isopropanol (IPA) and water, exhibited the properties listed in Table 3.
• the reference membrane only became extracted with IPA and water without first being treated with impregnating solution and / or electron beam radiation, another reference membrane was impregnated with water after impregnation and then extracted with IPA and water.
• the modified membrane has a significantly reduced TASZ compared to the reference membranes, especially after 72-hour Soxhlet extraction with ethanol. Consequently, the Output membrane permanently hydrophilized by the electron beam induced modification after impregnation with an aqueous solution of hydroxyethyl cellulose 4000, without any previous decomposition of the starting membrane occurs. Furthermore, the surface tension of the membrane is slightly increased. The flow is only slightly changed by the modification.
• the protein binding of the membranes according to the invention is comparable to the protein binding of the reference membranes.
• the modified membrane has a reduced TASZ compared to the reference membrane which has not been impregnated, especially after 72-hour Soxhlet extraction with ethanol. Consequently, the electron-beam-induced modification of the starting membrane permanently hydrophilizes it after impregnation with an aqueous solution of dextran, without any previous decomposition of the starting membrane. Furthermore, the surface tension of the membrane is slightly increased. The flow is reduced by the modification by 28% and 33%.
• the modified membrane has a significantly reduced TASZ compared to the reference membranes, especially after 72-hour Soxhlet extraction with ethanol. Consequently, the starting membrane is permanently hydrophilized by the electron beam induced modification by impregnation with an aqueous solution of Pluronics ® PE 3500, without prior decomposition of the starting membrane occurs. Furthermore, the non-specific protein binding of the membrane is significantly reduced by this modification. The flow is only slightly changed by the modification.
• the impregnation of the starting membrane of polyether type 15407 was expelled with a preparation under the trade name Novec ® EGC-1700 "Electronic fluid” 3M AG, a solution of a perfluorinated aliphatic polymer in Methylnonafluor (iso) butyl ethers, which has a solids content of 2% contains.
• the membrane was impregnated with the preparation Novec EGC-1700 ® "Electronic fluid” and modified with a radiation dose of 150 kGy and exhibited after extraction with IPA and water, the properties listed in Table 6.
• the reference membrane was impregnated with Novec EGC ® 1700 "Electronic fluid", but not irradiated and extracted analogous to the modified membrane.
• hydrophilic starting membrane type 15407 is characterized by the combination of the
• Irradiation and impregnation with Novec ® EGC-1700 is hydrophobic and has a significantly reduced surface tension of 21 mN / m, which is achieved neither by impregnation with Novec ® EGC-1700 without irradiation nor by impregnation with water and subsequent irradiation.
• the impregnation of the hydrophobic starting membrane of type 14907 was carried out with a solution of hydroxyethyl cellulose, viscosity 4000 ⁇ Pa * s in reverse osmosis (RO) water containing 1, 0 weight percent of the homopolymer.
• the membrane was modified according to the procedure described above under "General Description of Procedure" (dose 100 kGy (corresponds to 100 kJ / kg)) and had the properties listed in Table 7 after extraction with isopropanol (IPA) and water.
• the reference membrane was extracted with only IPA and water without first being treated with impregnating solution and / or electron beam radiation; Another reference membrane was irradiated with water after impregnation and then extracted with IPA and water.
• the hydrophobic starting membrane of type 14907 exhibits hydrophilic properties after the modification, the surface tension is markedly increased at 82 mN / m and the membrane wets spontaneously with water.
• the membrane was permanently hydrophilized without degradation of the membrane due to the irradiation.
• the impregnation of the hydrophobic starting membrane of the type 14907 was performed with a solution of polyvinylpyrrolidone-vinyl acetate (PVP-VA) under the trade name Luviskol ® VA 37 E by BASF SE, in reverse osmosis (RO) water containing 2.0 weight percent of the copolymer.
• PVP-VA polyvinylpyrrolidone-vinyl acetate
• RO reverse osmosis
• the hydrophobic starting membrane wets spontaneously with water after impregnation and irradiation; the surface tension is markedly increased at 80 mN / m without first causing decomposition of the membrane.
• the modified membrane has an increased surface tension compared to the reference membranes. Consequently, the electron-beam-induced modification of the starting membrane permanently hydrophilizes it after impregnation with an aqueous solution of polyethyloxazoline, without any previous decomposition of the starting membrane. Furthermore, the non-specific protein binding of the membrane is significantly reduced by this modification.
• the impregnation of the starting membrane of the type 15404 was performed with a solution of Pluriol ® 4000, available from BASF (polyethylene glycol having a mean molar mass 4000 g / mol), in reverse osmosis (RO) water, which is 1, 0 weight percent of the Homopolymers contained.
• the membrane was modified according to the procedure described above under "General Description of Procedure" (dose 75 kGy (equivalent to 75 kJ / kg)) and had the properties listed in Table 10 after extraction with isopropanol (IPA) and water.
• the reference membrane was extracted with only IPA and water without first being treated with impregnating solution and / or electron beam radiation; another reference membrane was irradiated with water after impregnation followed by IPA and water extracted:
• the membrane modified according to the invention has a significantly increased surface tension in comparison to the reference membranes, in particular even after a 72-hour Soxhlet extraction with ethanol. Consequently, the starting membrane is permanently hydrophilized by the electron beam induced modification by impregnation with an aqueous solution of Pluriol ® 4000, without prior decomposition of the starting membrane occurs. Furthermore, the surface tension is simultaneously increased drastically. The flow is not significantly reduced by the modification compared to the starting or reference membrane.

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