CA2481435C - Use of hydrophobically modified copolymers based on n-vinyl monomers for the production of membranes - Google Patents

Use of hydrophobically modified copolymers based on n-vinyl monomers for the production of membranes Download PDF

Info

Publication number
CA2481435C
CA2481435C CA2481435A CA2481435A CA2481435C CA 2481435 C CA2481435 C CA 2481435C CA 2481435 A CA2481435 A CA 2481435A CA 2481435 A CA2481435 A CA 2481435A CA 2481435 C CA2481435 C CA 2481435C
Authority
CA
Canada
Prior art keywords
carboxylic acids
weight
monoethylenically unsaturated
alkyl
polymers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA2481435A
Other languages
French (fr)
Other versions
CA2481435A1 (en
Inventor
Tanja Schneider
Frank Dietsche
Axel Sanner
Stefan Stein
Karin Neubecker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of CA2481435A1 publication Critical patent/CA2481435A1/en
Application granted granted Critical
Publication of CA2481435C publication Critical patent/CA2481435C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F226/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
    • C08F226/06—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a heterocyclic ring containing nitrogen
    • 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
    • B01D67/0002—Organic membrane manufacture
    • B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
    • B01D67/0011—Casting solutions therefor
    • 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
    • B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
    • B01D71/401—Polymers based on the polymerisation of acrylic acid, e.g. polyacrylate
    • 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
    • B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
    • B01D71/402—Polymers based on the polymerisation of fumaric acid or derivatives thereof
    • 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
    • B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
    • B01D71/403—Polymers based on the polymerisation of maleic acid or derivatives thereof
    • 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
    • B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
    • B01D71/404—Polymers based on the polymerisation of crotonic acid
    • 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
    • B01D71/44—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of groups B01D71/26-B01D71/42
    • B01D71/441—Polyvinylpyrrolidone
    • 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
    • B01D71/76—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/04—Hydrophobization
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/12—Specific ratios of components used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2325/00—Details relating to properties of membranes
    • B01D2325/02—Details relating to pores or porosity of the membranes
    • B01D2325/022—Asymmetric membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2325/00—Details relating to properties of membranes
    • B01D2325/38—Hydrophobic membranes
    • 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
    • B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
    • 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
    • B01D71/44—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of groups B01D71/26-B01D71/42
    • 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
    • B01D71/56—Polyamides, e.g. polyester-amides
    • 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

Abstract

The invention relates to the use of A copolymers containing a) 50 to 99 percent by weight of at least one N-vinyl lactam or N-vinyl amine, selected among the group comprising N-vinyl pyrrolidone, N-vinyl piperidone, N-vinyl caprolactam, N-vinyl imidazole, methylized N-vinyl imidazole, and N-vinyl formamide, and b) 1 to 50 percent by weight of at least one monomer, selected among one of the groups comprising b1) C8-C30 alkyl ester of monoethylenically unsaturated C3-C8 carboxylic acids; b2) N-C8-C30 alkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids; b3) N,N-C8-C30 dialkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids; b4) vinyl ester of aliphatic C8-C30 carboxylic acids; b5) C8-C30 alkyl vinyl ether, for the production of membranes.

Description

USE OF HYDROPHOBICALLY MODIFIED COPOLYMERS BASED ON
N VINYL MONOMERS FOR THE PRODUCTION OF MEMBRANES
The present invention relates to the use of copolymers A
containing a) from 50 to 99% by weight of at least one N-vinyllactam or N-vinylamine selected from the group consisting of N-vinylpyrrolidone, N-vinylpiperidone, N-vinylcaprolactam, N-vinylimidazole, methylated N-vinylimidazole, and N-vinylformamide, and b) from 1 to 50% by weight of at least one monomer selected from the group consisting of bl) Ce-C3o-alkyl esters of monoethylenically unsaturated C3-Ce carboxylic acids;
b2) N-C8-C3o-alkyl-substituted amides of monoethylenically unsaturated C~-CS carboxylic acids;
b3) N,N-C$-C3o-dialkyl-substituted~amides of monoethylenically unsaturated C3-Cg carboxylic acids;
b4) vinyl esters of aliphatic CB-C3o carboxylic acids; and b5) Ce-C3o-alkyl vinyl ethers to produce membranes.
The present invention further provides a semipermeable membrane comprising, as well as the copolymers described above, one or more hyrophobic polymers and also one or more hydrophilic polymers.
For a multiplicity of industrial applications use is nowadays made of membranes. For instance, membranes can be used to convert salt water into drinking water by reverse osmosis. Membranes are additionally suitable for cleaning industrial wastewaters or for recovering substances of value: for example, for recovering coating materials by ultrafiltration from electrocoating baths.
In the sectors of food technology, medicine and pharmacy, as well, membranes are increasingly finding application. For example, solutions of different macromolecules can be fractionated using membranes, or urea and toxins can be removed from the bloodstream in hemodialysis. For skin-controlled delivery of drugs, too, membranes can be used.

1a It is known that the morphology of a membrane is a critical determinant of its field of use. Selectivity and permeability are defined by the surface structure and surface coverage of a porous membrane, while the internal structure influences the mechanical properties of a membrane. In the manufacture of a membrane, therefore, attempts are made to tailor both the surface and the internal structure by an appropriate combination of the parameters which are set during the production process. Important influencing variables, such as the nature and composition of the polymers and solvents used to form the membranes, have been described in detail in EP-A 0 168 783.
EP-A 0 168 783 describes asymmetric microporous hollow fiber membranes for blood treatment which are composed of more than 90%
by weight of a hydrophobic polysulfone matrix polymer and also from 1 to 10% by weight of hydrophilic polyvinylpyrrolidone, which are readily wettable by water, and which exhibit excellent biocompatibility; that is, the substances of the body's own defence system which are present in the blood do not respond to the surface of the membranes. The incompatible hydrophilic polymers serve as pore formers and are washed out of the membrane following its solidification, although a certain fraction is to remain in order to render the otherwise hydrophobic membrane hydrophilic.
Causing part of the hydrophilic PVP to remain in the polysulfone matrix is achieved in accordance with EP-A 0 168 783 by extruding the solution of the two polymers within a narrowly confined viscosity range, thereby ensuring that the structure of the extruded hollow-fibrous formation is maintained until the fiber-forming polymer is precipitated and that, although the majority of the PVP used is washed from the spinning composition during precipitation, a fraction nevertheless remains in the membrane.
DE-A 19817364 describes producing membranes with predetermined hydrophilicity and porosity. To this end a hydrophilic polymer with bimodal molecular weight distribution is used. The low molecular weight fraction which can be washed out more readily following precipitation serves here to tailor the porosity. The high molecular weight fraction on the other hand, which is less readily washed out, determines the hydrophilicity of the membrane.
From EP-A 0 550 798 it is known that in membranes, like those obtained, for example, in accordance with EP-A 0 168 783, water-soluble PVP is still present. Accordingly, it is impossible to avoid minimal amounts being given off from these membranes to the medium under filtration when these membranes are used repeatedly a large number of times. As a result there is a change in (among other things) the retention properties of such membranes to more indistinct cutoff limits. Possibilities for making the PVP present in polysulfone membranes insoluble in water are described, for example, in EP-A 0 OB2 433 and EP-A 0 550 798. They describe formation of a three-dimensional network by means of chemical crosslinking and, respectively, crosslinking by means of ionizing radiation.
EP-A 0 876 819 and EP-A 0 953 358 disclose the use of copolymers of N-vinyllactams or N-vinylamine compounds and hydrophobically modified monomers as matrix components for producing solid pharmaceutical administration forms or cosmetic presentation forms.
It is an object of the present invention to reduce or suppress entirely the propensity of the hydrophilicizing component to be washed out of the membrane while retaining the membrane porosity.
We have found that this object is achieved by the use of the above-defined copolymers A in the production of semipermeable membranes and by the corresponding membranes.
Components a) of the copolymers A include the following polymerizable hydrophilic comonomers:

N-vinyllactams and N-vinylamines, especially N-vinylpyrrolidone, N-vinylpiperidone, N-vinylcaprolactam, N-vinylimidazole, N-vinyl-2-methylimidazole, N-vinyl-4-methylimidazole, and N-vinylformamide.
Preferred hydrophilic components are N-vinylpyrrolidone, N-vinylimidazole and N-vinylcaprolactam, with particular preference N-vinylpyrrolidone.
The fraction of the hydrophilic monomer units a) in the copolymer is in the range from 50 to 99% by weight, preferably from 60 to 99% by weight, with particular preference from 65 to 98% by weight.
Components b) include the following polymerizable hydrophobic comonomers:
bl) esters of monoethylenically unsaturated C3-Ce carboxylic acids with a C8-C3o alcohol, preferably a C12-C22 alcohol.
By monoethylenically unsaturated carboxylic acids having from 3 to 8 carbon atoms are meant, for example, acrylic acid, methacrylic acid, dimethacrylic acid, ethacrylic acid, malefic acid, citraconic acid, methylenemalonic acid, allylacetic acid, vinylacetic acid, crotonic acid, fumaric acid, mesaconic acid, and itaconic acid.
From this group of carboxylic acids use is made preferably of acrylic acid, methacrylic acid, malefic acid or mixtures of said carboxylic acids, with particular preference methacrylic acid.
Particular importance here is attached to the esters of acrylic and/or methacrylic acid with fatty alcohols having a chain length of from 12 to 22 carbon atoms.
Mention may be made here preferably of the following: myristyl acrylate, cetyl acrylate, stearyl acrylate, oleyl acrylate, behenyl acrylate, myristyl methacrylate, cetyl methacrylate, stearyl methacrylate, oleyl methacrylate, and behenyl methacrylate, particular preference being given, from this group, to the C12-C22-alkyl esters of methacrylic acid.
As further hydrophobic comonomers it is possible to use b2) N-Cg-C3o-alkyl-substituted or b3) N,N-Ce-C3o-dialkyl-substituted amides of monoethylenically unsaturated C3-CB carboxylic acids, the alkyl radicals being aliphatic or cycloaliphatic alkyl radicals having from 8 to 30, preferably from 8 to 22, with particular preference from 12 to 18 carbon atoms.
The amidated monoethylenically unsaturated carboxylic acids having from 3 to 8 carbon atoms may, as already mentioned above, stand, for example, for acrylic acid, methacrylic acid, dimethacrylic acid, ethacrylic acid, malefic acid, citraconic acid, methylenemalonic acid, allylacetic acid, vinylacetic acid, crotonic acid, fumaric acid, mesaconic acid, and itaconic acid.
From this group of carboxylic acids preference is likewise given to using acrylic acid, methacrylic acid, malefic acid or mixtures of said carboxylic acids.
Examples of preferred amidated comonomers are N-octylacrylamide, N-(2-ethylhexyl)acrylamide, N-nonylacrylamide, N-decylacrylamide, N-laurylacrylamide, N-myristylacrylamide, N-cetylacrylamide, N-stearylacrylamide, N-oleylacrylamide, N-behenylacrylamide, N-octylmethacrylamide, N-(2-ethylhexyl)methacrylamide, N-nonylmethacrylamide, N-decylmethacrylamide, N-laurylmethacrylamide, N-myristylmethacrylamide, N-cetylmethacrylamide, N-stearylmethacrylamide, N-oleylmethacrylamide, and N-behenylmethacrylamide, particular emphasis being placed, from this group, on the Clz-Cls-alkylamides.
As a further, additional component b) it is possible to use vinyl esters of long-chain aliphatic, saturated or unsaturated C8-C3o carboxylic acids, such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachic acid, behenic acid, lignoceric acid, cerotinic acid, and melissic acid.
Vinyl esters of the abovementioned C8-C1$ carboxylic acids find preferred use.
Furthermore, C8-C3o-alkyl vinyl ethers, preferably C8-Czz-alkyl vinyl ethers, can be copolymerized as comonomers b5).
Preferred C8-Czz-alkyl radicals of the vinyl ethers include unbranched alkyl chains such as n-octyl, 2-ethylhexyl, n-nonyl, n-~iecyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, n-heptadecyl, and n-octadecyl.
The fraction of the hydrophobic monomer units b) in the copolymer A is in the range from 1 to 50% by weight, preferably from 1 to 40% by weight, with particular preference from 2 to 35% by weight.
It will be appreciated that mixtures of two or more carboxylic acids, carboxamides, alkyl vinyl ethers or vinyl esters can be used as long as the sum of the fractions of these comonomers does not exceed 50% by weight.
Where appropriate it may be sensible to use, for the polymerization, not only the abovementioned monomers units a) and b) but also the comonomers c) listed below:
monoethylenically unsaturated carboxylic acids having from 3 to 8 carbon atoms such as acrylic acid, methacrylic acid, dimethacrylic acid, ethacrylic acid, malefic acid, citraconic acid, methylenemalonic acid, allylacetic acid, vinylacetic acid, crotonic acid, fumaric acid, mesaconic acid, and itaconic acid.
From this group of monomers it is preferred to use acrylic acid, methacrylic acid, malefic acid or mixtures of said carboxylic acids.
The monoethylenically unsaturated carboxylic acids can be used in the form of the free acids and - where available - the anhydrides or in partly or fully neutralized form for the copolymerization.
For neutralization it is preferred to use alkali metal or alkaline earth metal bases, ammonia or amines, e.g., sodium hydroxide solution, potassium hydroxide solution, sodium carbonate, potash, sodium hydrogen carbonate, magnesium oxide, calcium hydroxide, calcium oxide, gaseous or aqueous ammonia, triethylamine, ethanolamine, diethanolamine, triethanolamine, morpholine, diethylenetriamine or tetraethylenepentamine.
Examples of further suitable comonomers c) are the C1-C4-alkyl or hydroxyalkyl esters, amides, and nitriles of the abovementioned carboxylic acids, e.g., methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyisobutyl acrylate, hydroxyisobutyl methacrylate, monomethyl maleate, dimethyl maleate, monoethyl maleate, diethyl maleate, acrylamide, methacrylamide, N,N-dimethylacrylamide, N-tert-butylacrylamide, acrylonitrile, methacrylonitrile, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate, and the salts of the last-mentioned monomers with carboxylic acids or mineral acids, and also the quaternized products.
Also suitable as other, copolymerizable monomers are acrylamidoglycolic acid, vinylsulfonic acid, allylsulfonic acid, methallylsulfonic acid, styrenesulfonic acid, 3-sulfopropyl acrylate, 3-sulfopropyl methacrylate, and acrylamidomethylpropanesulfonic acid, and also monomers containing phosphonic acid groups, such as vinylphosphonic acid, allylphosphonic acid, and acrylamidomethylpropanephosphonic acid.
30' The fraction of the monomer units-c) in the copolymer can be in the range from 0 to 30% by weight, preferably from 0 to 20% by weight, with particular preference from 0 to 10% by weight, the percentages by weight for components a) to c) adding up to 100%.
Used preferably are water-insoluble copolymers A containing a) from 60 to 99% by weight of N-vinylpyrrolidone and b) from 1 to 40% by weight of at least one monomer selected from the group consisting of bl) CB-C3p-alkyl esters of monoethylenically unsaturated C3-C8 carboxylic acids;
b2) N-C8-C3o-alkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b3) N,N-CB-C3o-dialkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b4) vinyl esters of aliphatic C8-C3o carboxylic acids; and bs) Ca-C3o-alkyl vinyl ethers.
L3se is made with particular preference of water-insoluble copolymers A containing a) from 60 to 99% by weight of N-vinylpyrrolidone and b) from 1 to 40% by weight of at least one monomer selected from the group consisting of bl) Ci2-C22-alkyl esters of monoethylenically unsaturated C3-Ca carboxylic acids;
b2) N-C12-Cis-alkyl-substituted amides of monoethylenically unsaturated C3-Ca carboxylic acids;
b3) N,N-C12-C1$-dialkyl-substituted amides of monoethylenically unsaturated C3-Ca carboxylic acids;
b4) vinyl esters of aliphatic Ca-C1a carboxylic acids; and b5) CB-C2z-alkyl vinyl ethers.
Particularly suitable are copolymers A including as monomer units b) the monomers bl) with an alkyl radical of chain length C14 to Cis.
The copolymers are prepared by known processes, e.g., solution, precipitation, emulsion or inverted suspension polymerization, using compounds which form free radicals under the polymerization conditions.
The temperatures of polymerization are usually in the range from 30 to 200~C, preferably from 40 to 110~C.
Examples of suitable initiators are azo compounds and peroxy compounds and also the customary redox initiator systems, such as combinations of hydrogen peroxide and compounds having a reducing action, e.g., sodium sulfite, sodium bisulfate, sodium formaldehyde-sulfoxylate, and hydrazine.
The copolymers A possess K values of at least 20, preferably from 25 to 100, with particular preference from 30 to 80. The K values are determined by the method of H. Fikentscher, Cellulose-Chemie, Volume 13, 58 to 64 and 71 to 74 (1932) in aqueous or alcoholic solution at 25~C, at concentrations of between 0.1% and 5%
depending on the K value range.
The average molecular weight of the polymers A used in accordance with the invention is in the range from 30 000 to 10 000 000, preferably from 35 000 to 2 000 000, with particular preference from 40 000 to 1 500 000.
The polymer dispersions or solutions obtained can be converted into powder form by various drying processes such as, for example, spray drying, fluidized spray drying, roller drying or freeze drying, and an aqueous dispersion can be produced from this powder form by redispersing it in water.
Besides the copolymers A for use in accordance with the invention the membranes comprise, as a further component, component B, one or more polymers selected from the group consisting of polysulfones such as polyaryl ether sulfones, polycarbonates, polyamides, polyvinyl chloride, hydrophobically modified acrylic acid polymers, polyethers, polyurethanes, polyurethane copolymers, water-insoluble cellulose derivatives such as cellulose acetates, cellulose nitrates, and mixtures thereof. The preparation of these polymers is common knowledge. In production of the membranes they can be used in amounts of from 50 to 90.9%
by weight, preferably from 60 to 90% by weight. It is preferred to use polysulfones, polyamides or blends of polysulfones and polyamides.
The membranes may further comprise one or more hydrophilic polymers C selected from the group consisting of polyvinylpyrrolidones, polyethylene glycols, polyglycol monoesters, polyethylene glycol-propylene glycol copolymers, water-soluble cellulose derivates, and polysorbates. These hydrophilic polymers C may be used in amounts of from 0 to 50% by weight, preferably from 10 to 40% by weight, in the production of the membranes. As polymers C it is preferred to use polyvinylpyrrolidones, with particular preference in combination with polysulfones, polyamides or blends of polysulfones and polyamides.
In principle the copolymers A used in accordance with the invention are suitable for producing any of a very wide variety of wettable membrane types such as microporous membranes, examples being microporous hollow fiber membranes, homogeneous membranes, symmetrical membranes, and asymmetrical membranes.
With preference, microporous or asymmetrical membranes can be produced. The production of the various types of membrane is known to the skilled worker from the prior art.
Generally, the various components are converted into a solution which is then shaped appropriately, by casting or spinning for example.
The membranes are produced conventionally, for example, by a phase inversion process, such as is described in EP-A 082 433, hereby incorporated by reference.
Furthermore, it is also possible to obtain hollow fiber membranes by extrusion and precipitation of a polymer-containing spinning solution. A process of this kind is described, for example, in EP-A 168 783, likewise incorporated by reference.
Surprisingly it has been found that when the copolymers A of the invention are used the fraction of water-soluble polymer component which can be washed out of a membrane is reduced. With no change in the hydrophilicity of the membrane surface and with partial or complete replacement of the water-soluble polymers by the copolymers, the surface of the membrane was found to be permanent in respect of pore size and pore distribution.
The following examples are intended to illustrate but not restrict the process of the invention.
Examples Example 1 A polymer solution composed of 16% by weight of polysulfone (Ultrason E 6020P, BASF), 1% by weight of polyvinylpyrrolidone having a K value of 90, 7% by weight of polyvinylpyrrolidone having a K value of 30 and 1% by weight of a vinylpyrrolidone-stearyl methacrylate copolymer (VP:StMA=70:30) in N-methylpyrrolidone was applied in a 200 Eun film using a casting apparatus to a PVC carrier web and was coagulated in water for 10 minutes at 20°C. The membrane was dried at 40°C for 24 hours.
The dry membrane was weighed, after which water was passed through it for 30 minutes. The weight loss was determined after the membrane had been dried again at 40°C fvr 24 hours. In order to assess the washout of the hydrophilic polymer components, this procedure was repeated twice after 20 hours and 36 hours of water passage.

Examples 2 to 6 The membranes were obtained from polymer solutions differing in composition in analogy to the production instructions from Example 1. The weight loss of membranes in the following examples was determined in analogy to example 1.
Ex-B C C Copolymer A Weight loss am-_ PVP PVP [wt. %] [%]
poly K30 K90 ple~~ ~ [wt. [wt. Composition VP/5MA 0.5 ~ %J %] 70:30 h h h 1 64 28 4 4 14.7 22.624.5 2 64 28 0 8 11.8 21.423.1 3 64 28 8 0 11.4 26.128.3 4 53.3 33.3 6.6 6.6 21.2 35.235.9 5 53.3 33.3 0 13.3 17.9 34.435.3 6 53.3 33.3 13.3 0 27.2 43.444.4 The percentages by weight indicated in~the table refer to the theoretical content which is to be expected in the membrane in its dry state.
Examples 7 to 12 The membranes obtained in accordance with examples 1 to 6 were subjected to contact angle measurements using a contact angle measuring instrument of the type OCAH200 from Data Physics.

Example Membrane from exampleContact [degrees) angle (dist.
water) O.ls is lOs

Claims (11)

We claim:
1. The use of a copolymer A containing a) from 50 to 99% by weight of at least one N-vinyllactam or N-vinylamine selected from the group consisting of N-vinylpyrrolidone, N-vinylpiperidone, N-vinylcaprolactam, N-vinylimidazole, methylated N-vinylimidazole, and N-vinylformamide, and b) from 1 to 50% by weight of at least one monomer selected from the group consisting of b1) C8-C30-alkyl esters of monoethylenically unsaturated C3-C8 carboxylic acids;
b2) N-C8-C30-alkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b3) N,N-C8-C30-dialkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b4) vinyl esters of aliphatic C8-C30 carboxylic acids;
and b5) C8-C30-alkyl vinyl ethers to produce a membrane, the membrane comprising, as further component, hydrophobic polymers B selected from the group consisting of polysulfones, polycarbonates, polyamides, polyvinyl chloride, hydrophobically modified acrylic polymers, polyethers, polyurethanes, polyurethane copolymers, water-insoluble cellulose derivatives, and mixtures of such polymers.
2. The use as claimed in claim 1 of a copolymer A containing a) from 60 to 99% by weight of N-vinylpyrrolidone and b) from 1 to 40% by weight of at least one monomer selected from the group consisting of b1) C8-C30-alkyl esters of monoethylenically unsaturated C3-C8 carboxylic acids;
b2) N-C8-C30-alkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b3) N,N-C8-C30-dialkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b4) vinyl esters of aliphatic C8-C30 carboxylic acids;
and b5) C8-C30-alkyl vinyl ethers.
3. The use as claimed in claim 1 or 2 of copolymer A containing a) from 60 to 99% by weight of N-vinylpyrrolidone and b) from 1 to 40% by weight of at least one monomer selected from the group consisting of b1) C12-C22-alkyl esters of monoethylenically unsaturated C3-C8 carboxylic acids;
b2) N-C12-C18-alkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b3) N,N-C12-C18-dialkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b4) vinyl esters of aliphatic C8-C18 carboxylic acids;
and b5) C8-C22-alkyl vinyl ethers.
4. The use as claimed in any of claims 1 to 4, wherein the copolymer A is used in amounts of from 0.1 to 25% by weight, based on the total amount of polymers used.
5. The use as claimed in any of claims 1 to 4, wherein the copolymer A is used in combination with one or more further polymers.
6. The use as claimed in any of claims 1 to 5, wherein the hydrophobic polymers B are used in amounts of from 50 to 99.9 by weight, based on the total amount of polymers used.
7. The use as claimed in any of claims 1 to 6, wherein the membrane further comprises, as polymers C, hydrophilic polymers selected from the group consisting of polyvinylpyrrolidones, polyethylene glycols, polyethylene glycol monoesters, polyethylene glycol-propylene glycol copolymers, water-soluble cellulose derivatives, polysorbates, and mixtures of such polymers.
8. The use as claimed in claim 7, wherein the hydrophilic polymers C are used in amounts of from 10 to 40% by weight, based on the total amount of polymers used.
9. A semipermeable, water-wettable membrane comprising at least one copolymer A formed from a) from 50 to 99% by weight of at least one N-vinyllactam or N-vinylamine selected from the group consisting of N-vinylpyrrolidone, N-vinylpiperidone, N-vinylcaprolactam, N-vinylimidazole, methylated N-vinylimidazole, and N-vinylformamide, and b) from 1 to 50% by weight of at least one monomer selected from the group consisting of b1) C8-C30-alkyl esters of monoethylenically unsaturated C3-C8 carboxylic acids;
b2) N-C8-C30-alkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b3) N,N-C8-C30-dialkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
b4) vinyl esters of aliphatic C8-C30 carboxylic acids;
and b5) C8-C30-alkyl vinyl ethers, and, as hydrophobic polymer component B, a polymer selected from the group consisting of polysulfones, polycarbonates, polyamides, polyvinyl chloride, hydrophobically modified acrylic polymers, polyethers, polyurethanes, polyurethane copolymers, cellulose acetates, cellulose nitrates, and mixtures thereof.
10. A membrane as claimed in claim 9, obtainable using a copolymer A in amounts of from 0.1 to 25% by weight.
11. A membrane as claimed in claim 9 or 10 comprising in addition a hydrophilic polymer C selected from the group consisting of polyvinylpyrrolidones, polyethylene glycols, polyglycol monoesters, copolymers of polyethylene glycol with propylene glycol, water-soluble derivatives of cellulose, polysorbates, and mixtures thereof.
CA2481435A 2002-04-18 2003-04-11 Use of hydrophobically modified copolymers based on n-vinyl monomers for the production of membranes Expired - Fee Related CA2481435C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10217440A DE10217440A1 (en) 2002-04-18 2002-04-18 Use of hydrophobically modified copolymers based on N-vinyl monomers for the production of membranes
DE10217440.7 2002-04-18
PCT/EP2003/003764 WO2003086594A1 (en) 2002-04-18 2003-04-11 Use of hydrophobically modified copolymers based on n-vinyl monomers for the production of membranes

Publications (2)

Publication Number Publication Date
CA2481435A1 CA2481435A1 (en) 2003-10-23
CA2481435C true CA2481435C (en) 2011-02-01

Family

ID=28798565

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2481435A Expired - Fee Related CA2481435C (en) 2002-04-18 2003-04-11 Use of hydrophobically modified copolymers based on n-vinyl monomers for the production of membranes

Country Status (8)

Country Link
US (1) US7347938B2 (en)
EP (1) EP1499426B1 (en)
JP (1) JP4443231B2 (en)
AT (1) ATE321602T1 (en)
AU (1) AU2003229642A1 (en)
CA (1) CA2481435C (en)
DE (2) DE10217440A1 (en)
WO (1) WO2003086594A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10343901A1 (en) * 2003-09-19 2005-04-14 Basf Ag Amide group-containing ethylene terpolymers and their use
DE102004058952A1 (en) * 2004-12-07 2006-06-14 Basf Ag Process for preparing aqueous secondary dispersions of water-insoluble polymers
DE102009006586B4 (en) * 2009-01-29 2013-02-28 Neenah Gessner Gmbh Filter medium and filter element for the liquid filtration
AU2011221917B2 (en) * 2010-03-04 2015-12-24 Sekisui Chemical Co., Ltd. Macromolecular water-treatment membrane and manufacturing method therefor
WO2015164234A1 (en) 2014-04-25 2015-10-29 Carbon3D, Inc. Continuous three dimensional fabrication from immiscible liquids
JP6939547B2 (en) * 2016-02-29 2021-09-22 東レ株式会社 Laminated semipermeable membrane
WO2018198679A1 (en) * 2017-04-28 2018-11-01 東レ株式会社 Semipermeable composite membrane and method for producing same
CN110860211B (en) * 2019-11-29 2021-10-19 绿邦膜分离技术（江苏）有限公司 Preparation method of homogeneous phase PVC-based anion exchange membrane
CN112870980B (en) * 2021-01-11 2022-10-21 宁波方太厨具有限公司 Preparation method of nanofiltration membrane with adjustable desalination rate

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4304591A (en) * 1978-01-25 1981-12-08 Ciba-Geigy Corporation Water-insoluble hydrophilic copolymers used as carriers for medicaments and pesticides
US4268641A (en) * 1979-04-24 1981-05-19 Union Carbide Corporation Acrylic acid-acrylate copolymer thickening agents
DE3149976A1 (en) 1981-12-17 1983-06-30 Hoechst Ag, 6230 Frankfurt MACROPOROUS ASYMMETRIC HYDROPHILE MEMBRANE MADE OF SYNTHETIC POLYMER
EP0082355B1 (en) * 1981-12-21 1986-06-11 Aligena Ag Semipermeable membranes of modified polystyrene, process for their manufacture and their use
CH660852A5 (en) * 1982-11-23 1987-05-29 Aligena Ag DYNAMIC MEMBRANES THAT ARE THIN THIN POLYMER LAYERS ON POROUS, POLYMER CARRIER MATERIALS.
DE3426331A1 (en) 1984-07-17 1986-01-30 6380 Bad Homburg Fresenius AG ASYMMETRIC MICROPOROUS HOLLOW FIBER FOR HAEMODIALYSIS AND METHOD FOR THE PRODUCTION THEREOF
DE3434822A1 (en) * 1984-09-22 1986-04-03 Bayer Ag, 5090 Leverkusen MEMBRANE FOR REAGENT CARRIER LAYERS, METHOD FOR THE PRODUCTION THEREOF, AND THEIR USE IN ANALYTICAL AGENTS AND ANALYZING METHOD
US4976897A (en) * 1987-12-16 1990-12-11 Hoechst Celanese Corporation Composite porous membranes and methods of making the same
DE4123602A1 (en) * 1991-07-17 1993-01-21 Bayer Ag MEMBRANES OF AROMATIC HETEROCYCLIC POLYAMIDES, METHOD FOR THE PRODUCTION THEREOF AND THEIR USE
US5411580A (en) * 1991-07-31 1995-05-02 Praxair Technology, Inc. Oxygen-separating porous membranes
EP0550798A1 (en) 1991-10-04 1993-07-14 Kawasumi Laboratories, Inc. Polysulfone hollow fibre membrane
US5407581A (en) * 1992-03-17 1995-04-18 Asahi Medical Co., Ltd. Filter medium having a limited surface negative charge for treating a blood material
DE59405007D1 (en) * 1993-07-30 1998-02-19 Bayer Ag Membranes made from acrylonitrile copolymers, process for their preparation and their use
US6113785A (en) * 1995-10-09 2000-09-05 Asahi Kasei Kogyo Kabushiki Kaisha Polysulfone membrane for purifying blood
DE19627204A1 (en) * 1996-07-05 1998-01-08 Basf Ag Cosmetic or pharmaceutical compositions for use on the skin
DE19719187A1 (en) 1997-05-07 1998-11-12 Basf Ag Use of copolymers of N-vinyl-pyrrolidone in preparations of water-insoluble substances
US5942120A (en) * 1997-12-04 1999-08-24 Wilkinson; Kenneth Composite microporous ultrafiltration membrane, method of making thereof, and separation methods
DE19814730A1 (en) 1998-04-02 1999-10-07 Basf Ag Pharmaceutical and cosmetic compositions with matrix containing N-vinyllactam or N-vinylamine based copolymer
DE19817364C1 (en) 1998-04-18 1999-07-08 Fresenius Medical Care De Gmbh Hydrophilic asymmetric membrane used in ultrafiltration and reverse osmosis
DE19829397A1 (en) * 1998-07-01 2000-01-05 Basf Ag Use of micro-phase separated polymer mixtures for the production of permeable membranes
WO2001088025A1 (en) * 2000-05-16 2001-11-22 Biocure, Inc. Membranes formed from amphiphilic copolymers
EP1306121B1 (en) 2000-07-27 2010-01-06 Nof Corporation Modified hollow-fiber membrane
FR2820057A1 (en) * 2001-01-30 2002-08-02 Ct De Transfert De Technologie MEMBRANE FOR ENCAPSULATING CHAMBER OF CELLS PRODUCING AT LEAST ONE BIOLOGICALLY ACTIVE SUBSTANCE AND BIO-ARTIFICIAL ORGAN COMPRISING SUCH A MEMBRANE
US6596167B2 (en) * 2001-03-26 2003-07-22 Koch Membrane Systems, Inc. Hydrophilic hollow fiber ultrafiltration membranes that include a hydrophobic polymer and a method of making these membranes

Also Published As

Publication number Publication date
CA2481435A1 (en) 2003-10-23
DE10217440A1 (en) 2003-11-06
EP1499426B1 (en) 2006-03-29
WO2003086594A1 (en) 2003-10-23
US20050126987A1 (en) 2005-06-16
JP2005527351A (en) 2005-09-15
ATE321602T1 (en) 2006-04-15
US7347938B2 (en) 2008-03-25
AU2003229642A1 (en) 2003-10-27
JP4443231B2 (en) 2010-03-31
EP1499426A1 (en) 2005-01-26
DE50302817D1 (en) 2006-05-18

Similar Documents

Publication Publication Date Title
US5605970A (en) Synthesis of high molecular weight anionic dispersion polymers
KR102204007B1 (en) Membranes Having Antibiotic and Hydrophilic Properties and Preparing Method Thereof
CA2481435C (en) Use of hydrophobically modified copolymers based on n-vinyl monomers for the production of membranes
JP3378606B2 (en) Water-soluble polymer monodispersion
US6103820A (en) Preparation of water-soluble copolymers of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer
KR102069080B1 (en) Polymer composition and porous membrane
US20070056900A1 (en) Use of copolymers containing n-vinyl lactam for producing functionalized membranes
EP0061610A1 (en) Semipermeable membranes from acrylonitrile-based polymers, process for their preparation and their use
EP0953358A1 (en) Use of coplymers comprising N-Vinyllactam and/or N-Vinylamine as matrix for preparing solid pharmaceutical and/or application forms
WO1992003215A1 (en) Hydrophilic semipermeable membranes based on copolymers of acrylonitrile and hydroxyalkyl esters of (meth) acrylic acid
WO2004069888A3 (en) Block copolymers
KR102083155B1 (en) Method for producing aqueous solutions of vinyl lactam polymers and powders thereof
CA2626572C (en) Aqueous dispersions of water-soluble polymers with comblike stabilizers
DE10139003B4 (en) Process for the preparation of an N-vinyl compound polymer
CA2203175A1 (en) Use of a polymer based on basic vinyl heterocycles for coating printable materials
ES2241304T3 (en) WATER SOLUBLE OR AVAILABLE IN WATER COPOLYMERS.
EP0636404B1 (en) Membranes made from acrylonitrile copolymers, process for their manufacture and their use
CN110709156A (en) Porous membrane for water treatment
JP7459068B2 (en) Peroxide-stable polymer compositions and methods of production thereof, and uses thereof
JP3305778B2 (en) Hydrophilized polysulfone-based resin hollow fiber membrane and method for producing the same
KR101072977B1 (en) Method for manufacturing sponge-type hollow fiber membrane made of polyacrylonitrile
Siriwatwechakul et al. Thermo-sensitive hydrogel: control of hydrophilic-hydrophobic transition
Abbas et al. Surface Modification of RO Membrane by Grafting Hydrophilic Switchable Polymer Brushes
Barik et al. Synthesis and Characterisation of PVA/PVOH Based Super Porous Hydrogel
DE4341601A1 (en) Membranes based on copolymers of acrylonitrile

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20160411