WO2013011272A1 - Curable compositions and membranes - Google Patents
Curable compositions and membranes Download PDFInfo
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- WO2013011272A1 WO2013011272A1 PCT/GB2012/051568 GB2012051568W WO2013011272A1 WO 2013011272 A1 WO2013011272 A1 WO 2013011272A1 GB 2012051568 W GB2012051568 W GB 2012051568W WO 2013011272 A1 WO2013011272 A1 WO 2013011272A1
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- WIPO (PCT)
- Prior art keywords
- composition
- membrane
- meth
- curable
- curable compound
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- 239000012528 membrane Substances 0.000 title claims abstract description 160
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D2053/221—Devices
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- 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
- B01D2323/345—UV-treatment
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/34—Molecular weight or degree of polymerisation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/42—Ion-exchange membranes
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- 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
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/24—Homopolymers or copolymers of amides or imides
-
- 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
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/24—Homopolymers or copolymers of amides or imides
- C08J2333/26—Homopolymers or copolymers of acrylamide or methacrylamide
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- 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
- C08J2335/00—Characterised by the use of homopolymers or 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 carboxyl radical, and containing at least one other carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Derivatives of such polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0082—Organic polymers
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- This invention relates to curable compositions, to their use in the preparation of membranes and to the use of such membranes in ion exchange processes.
- Ion exchange membranes are useful in a number of applications, including electrodeionisation (EDI), continuous electrodeionisation (CEDI), electrodialysis (ED), electrodialysis reversal (EDR) and capacitive deionisation used in e.g. flow through capacitors (FTC) for the purification of water, Donnan or diffusion dialysis (DD) for e.g. fluoride removal or the recovery of acids, pervaporation for dehydration of organic solvents, fuel cells, electrolysis (EL) of water or for chlor- alkali production, and reverse electrodialysis (RED) where electricity is generated from two streams differing in salt concentration separated by an ion-permeable membrane.
- EDI electrodeionisation
- CEDI continuous electrodeionisation
- ED electrodialysis
- EDR electrodialysis reversal
- FTC flow through capacitors
- DD diffusion dialysis
- EL electrolysis
- RED reverse electrodialysis
- EDI is a water treatment process wherein ions are removed from aqueous liquids using a membrane and an electrical potential to effect ion transport. It differs from other water purification technologies, such as conventional ion exchange, in that it is does not require the use of chemicals such as acids or caustic soda. EDI can be used to produce ultra pure water.
- ED and EDR are electrochemical separation processes that remove ions and other charged species from water and other fluids. ED and EDR use small quantities of electricity to transport these species through membranes composed of ion exchange material to create separate purified and concentrated streams. Ions are transferred through the membranes by means of direct current (DC) voltage and are removed from the feed water as the current drives the ions through the membranes to desalinate the process stream. ED and EDR are suitable techniques for producing drinking water. Ion exchange membranes are also used in Zero Liquid Discharge (ZLD) and Zero Discharge Desalination (ZDD).
- ZLD Zero Liquid Discharge
- ZDD Zero Discharge Desalination
- MEA membrane electrode assembly
- the membranes have good permselectivity and low electrical resistance. Additionally the membranes are desired to be strong, while at the same time being flexible. Flexibility is required for membranes which are to be wound into tight circumferential structures. The membranes also need to retain their physical integrity over an extended period of time. Desirably the method used to prepare the membranes does not result in excessive curl. It is also desirable for the membranes to be resistant to the chemicals that they can come into contact with, e.g. resistant to hydrolysis. Low swelling on contact with water can also be useful for membranes intended for use in aqueous environments.
- Membrane users require the lowest prices available, which means production processes for the membranes are ideally inexpensive and the membranes should be easily capable of mass production.
- US2007/0196721 describes high molecular weight crosslinkable sulfonated copolymers for use in fuel cells.
- the present invention seeks to provide compositions suitable for use in the preparation of membranes, in addition to rapid processes for preparing the membranes and the membranes prepared by the processes.
- a membrane obtainable from curing a composition comprising:
- MW is the molecular weight of the said curable compound
- n has a value of 1 , 2, 3 or 4 and is the number of sulphonic acid groups present in the said curable compound
- curable compound having one ethylenically unsaturated group optionally (ii) a curable compound having one ethylenically unsaturated group; wherein the molar fraction of curable compounds comprising at least two (meth)acrylic groups, relative to the total number of moles of curable compounds present in the composition, is at least 0.25.
- MF (Mpoly/(Mtotal)
- Mpoiy is the number of moles of curable compounds comprising at least two (meth)acrylic groups present in the composition.
- Mtotai is the total number of moles of curable compounds present in the composition.
- the at least two (meth)acrylic groups may be the identical to each other, different from each other or some may be the same as each other and others different.
- the at least two (meth)acrylic groups may all be acrylic groups (e.g. all are acrylate groups or all are acrylamide groups and so are identical to each other) or they may comprise one methacrylic group and one acrylic group (i.e. they are different from each other).
- the at least two (meth)acrylic groups comprise one or more (meth)acrylate groups and one or more (meth)acrylamide groups, i.e. at least two are different from each other. Further permutations of the (meth)acrylate and (meth)acrylamide groups are also possible.
- the at least two (meth)acrylic groups comprise one or two acrylamide groups and in another embodiment the at least two (meth)acrylic groups are all (meth)acrylate groups, especially all acrylate groups.
- Component (i) comprises one or more sulphonic acid group(s) which are in the free acid form or, preferably, partially or wholly in salt form.
- the preferred salts are lithium, ammonium, sodium and potassium salts and mixtures comprising two or more thereof.
- Component (i) preferably has two, three or four (meth)acrylic groups, more preferably two, three or four acrylic groups, especially two acrylic groups.
- the preferred (meth)acrylic groups are acrylic groups because they are more reactive than methacrylic groups and therefore one may obtain a membrane more quickly when using acrylic groups.
- Preferred acrylic groups are acrylamide groups because they are particularly stable against hydrolysis.
- component (i) When the composition is free from component (ii) it is possible that component (i) will be the only curable component present in the composition. Under such circumstances MF has a value of 1 .
- Component (i) may comprise one or more than one curable compound comprising at least two (meth)acrylic groups and a sulphonic acid group.
- Curable compounds having a molecular weight which satisfies the equation set out above can provide membranes having particularly good permselectivity and low electrical resistance.
- the MW of component (i) is ⁇ (200 + 200n), more preferably ⁇ (150 + 150n), wherein MW and n are as hereinbefore defined.
- a low MW is preferred because a higher charge density (ion exchange capacity) can then be achieved in the resultant membrane.
- the curable compound comprising at least two (meth)acrylic groups and a sulphonic acid group is preferably a compound of the Formula (1 ):
- Ri and F1 ⁇ 2 are each independently H or methyl
- R3 and R 4 are each independently H or alkyl, or R 3 and R 4 together with the N atoms to which they are attached and Y form an optionally substituted 6- or 7-membered ring;
- Y is an optionally substituted and optionally interrupted
- the compound of Formula (1 ) has 1 , 2, 3 or 4 sulphonic acid groups; and provided that the compound of Formula (1 ) has a molecular weight which satisfies the equation:
- Mw is the molecular weight of the compound of Formula (1 ); and n has a value of 1 , 2, 3 or 4 and is the number of sulphonic acid groups present in the compound of Formula (1 ).
- R 3 or R is alkyl it is preferably Ci -4 -alkyl.
- R 3 and R 4 together with the N atoms to which they are attached and Y form an optionally substituted 6- or 7-membered ring they preferably form an optionally substituted piperazine, homopiperazine or triazine ring, especially such a ring having one or more groups selected from sulphonic acid groups and salts thereof.
- the optional interruptions which may be present in Y are preferably ether or, more preferably, amino groups.
- Y is an optionally substituted alkylene group it is preferably of the formula C n H 2n - m (SO3H) m or a salt thereof, wherein n is 3 to 8 (especially 3 to 6) and m is 1 to 4.
- Y is an optionally substituted arylene group it is preferably phenylene having one, two, three or four sulphonic acid substituents and optionally one or more further substituents (e.g. Ci -4 -alkyl groups).
- the sulphonic acid group(s) are typically part of the group represented by Y or part of the optionally substituted 6- or 7-membered ring which can be formed from -R 3 -N-Y-N-R - (wherein Y, R 3 and R 4 are as hereinbefore defined).
- component (i) consists of one or more than one (e.g. two to five) compounds of Formula (1 ).
- the curable compounds of Formula (1 ) may be obtained commercially or by any suitable method, for example by condensing an acryloyi halide at pH >8 with a compound having a sulphonic acid group and two or more nucleophilic groups, e.g. hydroxy and/or amino groups.
- curable compounds of Formula (1 ) include the following and salts thereof:
- component (i) in the compositions has the advantage over using conventional curable compounds having at least two (meth)acrylic groups and lacking sulphonic acid groups in that component (i) may be used to prepare membranes without diluting the membrane's ionic charge density or ion exchange capacity.
- Component (i) is preferably present in the composition in an amount of 2 to 80 wt%, more preferably 4 to 70 wt% and especially 5 to 68 wt%.
- wt% figures are relative to the total weight of the composition (e.g. (weight of component/weight of composition) x 100%)).
- composition comprises both components (i) and (ii)
- relatively high ratios of components (i):(ii) can be used to achieve a highly crosslinked, low swelling membrane without adversely affecting the membrane's permselectivity and electrical resistance.
- At least 60wt%, more preferably at least 75wt%, especially at least 90wt%, more especially substantially all of the curable components present in the composition carry anionic groups, especially sulphonic acid groups in free acid or salt form.
- the ethylenically unsaturated group present in component (ii) is a (meth)acrylic group.
- suitable (meth)acrylic groups are as discussed above in relation to component (i).
- the ethylenically unsaturated group is a (meth)acrylamide group because this can result in membranes having particularly good resistance to hydrolysis.
- curable compounds having one ethylenically unsaturated group include (meth)acrylic acid, beta carboxy ethyl acrylate, maleic acid, maleic acid anhydride, vinyl sulphonic acid, phosphonomethylated acrylamide, (2- carboxyethyl)acrylamide, 2-(meth)acrylamido-2-methylpropanesulfonic acid and esters and amides of the foregoing, especially Ci -4 -alkyl esters, unsubstituted amides and amides having one or two Ci -4 -alkyl groups.
- the curable compound having one ethylenically unsaturated group comprises an acidic group (e.g.
- Component (ii) may comprise more than one compound, e.g. 1 to 5 compounds.
- component (ii) optionally comprises a curable compound having one ethylenically unsaturated group and an acidic group and a curable compound having one ethylenically unsaturated group which is free from acidic groups (e.g. it may be one of the aforementioned esters and amides).
- the most preferred component (ii) is 2-acrylamido-2-methylpropanesulfonic acid and salts thereof.
- Component (ii) can provide the resultant composite membrane with a desirable degree of flexibility, which is particularly useful in applications requiring tightly wound membranes.
- component (ii) has an anionic group it also assists the composite membrane in distinguishing between ions of different charges.
- component (ii) comprises an anionic group, especially an anionic sulphonic acid group.
- Component (ii) is preferably present in the composition in an amount of 1 to
- 70wt% more preferably 10 to 60wt%, especially 20 to 50wt%.
- the molar ratio of component (i) to (ii) (when present) is at least 0.05, more preferably at least 0.15, especially at least 0.2, more especially at least 0.25.
- the molar ratio of component (i) to (ii) may also be at least 0.5, e.g. at least 1 .
- the total wt% of components (i) + (ii) relative to the total weight of the composition is preferably 30 to 90 wt%, more preferably 40 to 80 wt%, especially 50 to 75 wt%, more especially 58 to 70 wt%, e.g. about 61 wt% or about 65 wt%
- the composition further comprises a solvent.
- a solvent can lower the viscosity of the composition and make it more suitable for curing in high-speed, continuous manufacturing processes.
- the solvent is not curable and instead acts as a non-reactive diluent for the other components of the composition.
- Polar solvents especially aqueous solvents, are preferred because these are particularly good at dissolving the component (i) and any other components having ionic groups.
- at least half of the solvent is water, with the balance comprising organic solvent.
- the organic solvent can be useful for providing a homogenous solution of all the components of the composition.
- the inclusion of an organic solvent is also useful for reducing the viscosity and/or surface tension of the composition, making the manufacture of membranes easier in some respects.
- the solvent comprises at least 60wt% water, more preferably at least 80wt% water.
- the composition comprises 15 to 70wt%, more preferably 20 to 65wt%, especially 25 to 60 wt%, more especially 25 to 45wt% solvent, particularly 25 to 40wt%.
- the solvent is preferably water or a mixture comprising water and a water- miscible organic solvent. Due to the presence of a water-miscible organic solvent, water-immiscible solvents may also be tolerated in small amounts such that the overall solvent mixture is miscible.
- the weight ratio of water:organic solvent is preferably between 10:1 and 1 :2, more preferably between 4:1 and 1 :1 and especially between 3:1 and 2:1 .
- the organic solvent is optionally a single organic solvent or a combination of two or more organic solvents.
- Preferred organic solvents include Ci- 4 -alcohols (e.g. methanol, ethanol and propan-2-ol), diols (e.g. ethylene glycol and propylene glycol), triols (e.g. glycerol), carbonates (e.g. ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, di-t-butyl dicarbonate and glycerin carbonate), dimethyl formamide, acetone, N-methyl-2-pyrrolidinone and mixtures comprising two or more thereof.
- a particularly preferred organic solvent is propan-2-ol.
- the optimum solvent content for the curable composition can be determined for each combination by simple experimentation.
- the composition further comprises a curable compound comprising at least two (meth)acrylic groups and being free from sulphonic acid groups.
- a curable compound comprising at least two (meth)acrylic groups and being free from sulphonic acid groups.
- component (iii) Compounds which may be used as component (iii) include isophoronediacrylamide, N,N'-(1 ,2-dihydroxyethylene) bis-acrylamide, N,N- methylene-bis-acrylamide, N,N'-ethylenebis(acrylamide), N,N'-propylene bis(meth)acrylamide, ⁇ , ⁇ '-butylene bis(meth)acrylamide, bis(aminopropyl)methylamine diacrylamide.
- component (iii) Particularly preferred compounds which may be used as component (iii) include 1 ,4-diacryoyl piperazine and 1 ,4- bis(acryloyl)homopiperazine.
- the molecular weight of component (iii) is lower than 500 Dalton, more preferably lower than 250 Dalton.
- the composition preferably comprises 0 to 40 wt% of component (iii), more preferably 0 to 30wt%. In one embodiment the composition comprises 2 to 30 wt%, more preferably 5 to 20wt% of component (iii). In another embodiment the composition is free from component (iii). In a further embodiment, the composition comprises up to 50wt% of component (iii) with the proviso that component (iii) comprises an anionic group and is free from sulphonic acid groups.
- component (iii) When component (iii) is free from anionic groups it dilutes the amount of charge which is present in the resultant membrane.
- the composition is free from such compounds (i.e. curable compounds comprising at least two (meth)acrylic groups and being free from anionic groups) or such compounds are present in only small amounts, e.g. in a weight ratio of less than about 50wt%, more preferably less than 30%, especially less than 20% relative to the weight of component (i).
- component (iii) may be present in a relatively high amount e.g. a higher wt% than that of component (i) but preferably in this situation a high amount of component (ii) is present wherein component (ii) comprises an anionic group.
- Components (i) and (iii) (when present) each comprise at least two (meth)acrylic groups and therefore the amount of both are taken into account when determining the value of M p0 i y .
- Component (ii) is able to react with component (i) (and component (iii) when present) and can provide the resultant membrane with a desirable degree of flexibility, which is particularly useful in applications requiring tightly wound membranes.
- component (ii) has an ionic group, as is preferred, this can also help the membrane to distinguish between ions of different charges.
- the composition comprises less than 10wt%, more preferably less than 5wt%, of ethylenically unsaturated compounds other than components (i) and (ii). In a preferred embodiment the composition is free from ethylenically unsaturated compounds other than components (i) and (ii).
- component (i) (and component (iii) when present) provide strength to the membrane, while potentially reducing flexibility.
- MF is at least 0.30, more preferably at least 0.35.
- MF is below 0.95, more preferably below 0.85.
- the composition preferably has an MF of 0.30 to 0.95, more preferably 0.35 to 0.85.
- the composition has a pH of 0 to 1 1 .
- the pH of the composition depends to some extent on whether the sulphonic acid group is in the free acid or salt form.
- the composition preferably has a pH of 0.2 to 5, more preferably 0.5 to 2.5, especially about 1 .5.
- the sulphonic acid group is at least 95% in the salt form the composition preferably has a pH of 1 to 10, more preferably 1 .5 to 7.
- composition is free from radical initiators.
- composition comprises a radical initiator, for example a photoinitiator.
- the composition When the composition contains 0% radical initiator it may be cured using electron beam radiation. Preferably, however, the composition comprises 0.01 to 10 wt%, more preferably 0.05 to 5 wt%, especially 0.1 to 2wt% radical initiator.
- the preferred radical initiator is a photoinitiator.
- the radical initiator is often referred to as component (iv) in this specification.
- the curable composition may comprise one or more than one radical initiator as component.
- type I photoinitiators are preferred.
- type I photoinitiators are as described in WO 2007/01 8425, page 14, line 23 to page 1 5, line 26, which are incorporated herein by reference thereto.
- Especially preferred photoinitiators include alpha-hydroxyalkylphenones, e.g. 2-hydroxy-2-methyl-1 -phenyl propan-1 - one and 2-hydroxy-2-methyl-1 -(4-tert-butyl-) phenylpropan-1 -one, and acylphosphine oxides, e.g. 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.
- a radical initiator is present in the composition
- a polymerization inhibitor is also included (e.g. in an amount of below 2wt%). This is useful to prevent premature curing of the composition during, for example, storage.
- Suitable inhibitors include hydroquinone, hydroquinone mono methyl ether, 2,6-di-t-butyl-4-methylphenol, 4-t-butyl-catechol, phenothiazine, 4-oxo- 2,2,6,6-tetramethyl-1 -piperidinoloxy, free radical, 4-hydroxy-2,2,6,6-tetramethyl-1 - piperidinoloxy, free radical, 2,6-dinitro-sec-butylphenol, tris(N-nitroso-N- phenylhydroxylamine) aluminum salt, OmnistabTM IN 510, GenoradTM polymerisation inhibitors and mixtures comprising two or more of the foregoing.
- the curable composition may contain other components, for example acids, pH controllers, preservatives, viscosity modifiers, stabilisers, dispersing agents, antifoam agents, organic/inorganic salts, anionic, cationic, non-ionic and/or amphoteric surfactants and the like.
- the curable composition may of course contain further components not specifically mentioned or excluded above.
- Curing rates may be increased by including an amine synergist in the curable composition.
- Suitable amine synergists are, for example, free alkyl amines, e.g. triethylamine or triethanol amine; aromatic amines, e.g. 2-ethylhexyl- 4-dimethylaminobenzoate, ethyl-4-dimethylaminobenzoate and also polymeric amines as polyallylamine and its derivatives.
- Curable amine synergists such as ethylenically unsaturated amines (e.g. acrylated amines) are preferable since their use will give less odour due to their ability to be incorporated into the membrane by curing.
- the amount of amine synergists is preferably from 0.1 to 10wt.% based on the total weight of polymerisable components in the composition, more preferably from 0.3 to 3wt%.
- the composition preferably has an MF of at least 0.25 and comprises:
- MW is the molecular weight of the said curable compound
- n has a value of 1 , 2, 3 or 4 and is the number of sulphonic acid groups present in the said curable compound
- composition preferably has an MF of at least 0.25 and comprises:
- MW is the molecular weight of the said curable compound
- n has a value of 1 , 2, 3 or 4 and is the number of sulphonic acid groups present in the said curable compound
- composition has an MF of at least 0.35 and comprises:
- MW is the molecular weight of the said curable compound
- n has a value of 1 , 2, 3 or 4 and is the number of sulphonic acid groups present in the said curable compound
- component (I) preferably comprises a compound of the
- compositions form a further feature of the present invention.
- the composition is free from, or substantially free from, methacrylic compounds (e.g. methacrylate and methacrylamide compounds), i.e. the composition comprises at most 10 wt% of compounds comprising one or more methacrylic groups.
- methacrylic compounds e.g. methacrylate and methacrylamide compounds
- the composition comprises at most 10 wt% of compounds comprising one or more methacrylic groups.
- composition is free from, or substantially free from, divinyl benzene and derivatives thereof.
- composition is free from, or substantially free from, styrene and derivatives thereof.
- the composition is free from, or substantially free from, dyes and pigments. This is because there is no need to include dyes or pigments in the composition.
- the preferred composition is free from, or substantially free from, divinyl benzene, dyes, pigments, styrene, methacrylic compounds and compounds having tetralkyl-substituted quaternary ammonium groups.
- Membranes comprising the above structural unit form a further feature of the present invention.
- concentration of such units in the membrane will depend on the concentration of the compound of Formula (1 ) used to make the membrane relative to the amount of any other curable components in the aforementioned composition.
- Such membranes preferably further comprise structural units obtained from curing component (ii).
- composition is the composition defined in the first aspect of the present invention.
- Hitherto membranes have often been made in slow and energy intensive processes, often having many stages.
- the present invention enables the manufacture of membranes in a simple process that may be run continuously for long periods of time to mass produce membranes relatively cheaply.
- the process comprises the further step of separating the cured composition and support.
- this further step may be omitted and thereby a composite membrane is produced comprising the cured composition and a porous support.
- the thickness of the membrane, including the support, when present, is preferably less than 250 ⁇ , more preferably between 10 and 20 ⁇ , most preferably between 20 and 150 ⁇ .
- the membrane has a calculated ion exchange capacity ("IEC") of at least 0.1 meq/g, more preferably of at least 0.3meq/g, especially more than 0.6meq/g, more especially more than 1 .0meq/g, particularly more than 3.5meq/g of total dry weight of the composition. lEC's towards the upper end of these ranges are preferred in order to reduce the electrical resistance of the resultant membrane.
- the resultant IEC is expressed as milli-equivalents per gram of dry (i.e. solvent-free) composition (meq/g). Any solvents present in the composition, including any non-curable diluents or waters of crystallisation present in any ingredient used to make the composition, are therefore excluded from the calculation of IEC.
- the membrane has a high calculated crosslink density ("CD") in order to improve the strength and robustness of the resultant membrane.
- CD calculated crosslink density
- CD ( (xrl J-Mi/MWiVMtota,
- Mi is the amount of compound i having x, curable groups in grams
- MW is the molecular weight of compound i in g per mmol.
- Mtotai is the total amount of curable compounds in grams.
- the CD is at least 1 .3 mmol/g, more preferably at least 1 .5 mmol/g, especially at least 1 .75 mmol/g.
- the membrane has a permselectivity for small cations (e.g. Na + ) of more than 80%, more preferably more than 85%, especially more than 90% and more especially more than 95%.
- small cations e.g. Na +
- the membrane has an electrical resistance less than 5ohm.cm 2 , most preferably less than 3ohm.cm 2 .
- the electrical resistance may be determined by the method described below in the examples section.
- the membrane exhibits a % weight loss when ultrasonicated for
- the % weight loss can be controlled by, for example, selecting appropriate amounts of components (ii) and (iii) and by adjusting appropriate parameters in the curing step. Electrical resistance and permselectivity may be measured by the methods described by Djugolecki et al, J. of Membrane Science, 319 (2008) on pages 217- 218.
- the ion exchange membrane is substantially non-porous e.g. the pores are smaller than the detection limit of a standard Scanning Electron Microscope (SEM).
- SEM Scanning Electron Microscope
- Jeol JSM-6335F Field Emission SEM applying an accelerating voltage of 2kV, working distance 4 mm, aperture 4, sample coated with Pt with a thickness of 1 .5nm, magnification 100,000x, 3° tilted view
- the average pore size is generally smaller than 5nm, preferably smaller than 2 nm.
- the resultant membrane preferably has a low water permeability so that ions may pass through the membrane and water molecules do not pas through the membrane.
- the membrane's water permeability is lower than 1 x 10 "7 m 3 /m 2 .s.kPa, more preferably lower than 1 x 10 "8 m 3 /m 2 .s.kPa, most preferably lower than 1 x 10 "9 m 3 /m 2 .s.kPa, especially lower than 1 x 10 "10 m 3 /m 2 .s.kPa.
- the requirements for water permeability depend on the intended use of the membrane.
- a surfactant or combination of surfactants may be included in the composition as a wetting agent or to adjust surface tension.
- Commercially available surfactants may be utilized, including radiation-curable surfactants.
- Surfactants suitable for use in the composition include non-ionic surfactants, ionic surfactants, amphoteric surfactants and combinations thereof.
- Preferred surfactants are as described in WO 2007/018425, page 20, line 15 to page 22, line 6, which are incorporated herein by reference thereto. Fluorosurfactants are particularly preferred, especially Zonyl ® FSN (produced by E.I. Du Pont).
- the components of the composition are selected such that no phase separation occurs during the curing step. In this way, the likelihood of a porous structure in the resultant membrane is reduced.
- the network structure of the membrane is determined to a large extent by the identity of the crosslinking agent(s) and the curable compound and their functionality, e.g. the number of crosslinkable groups they contain per molecule.
- the composition may form a layer on top of the support, or it may permeate wholly or partially into the pores of the support thereby forming an impregnated composite membrane after curing.
- the composition may also be applied to both sides of the support to achieve a symmetrical composite membrane.
- the support is saturated with the composition and the saturated support is cured by EB or UV irradiation.
- the process of the present invention may contain further steps if desired, for example washing and/or drying the resultant membrane.
- the support Before applying the composition to the surface of the support, the support may be subjected to a corona discharge treatment, plasma glow discharge treatment, flame treatment, ultraviolet light irradiation treatment, chemical treatment or the like, e.g. for the purpose of improving its wettability and the adhesiveness.
- the support may also be treated to modify its surface energy, e.g. to values above 70 mlM/m.
- the support may be in the form of a roll which is unwound continuously or the support may rest on a continuously driven belt (or a combination of these methods). Using such techniques the composition can be applied to the support on a continuous basis or it can be applied on a large batch basis.
- the composition may be applied to the support by any suitable method, for example by curtain coating, blade coating, air-knife coating, knife-over-roll coating, slide coating, nip roll coating, forward roll coating, reverse roll coating, micro-roll coating, dip coating, foulard coating, kiss coating, rod bar coating or spray coating.
- the coating of multiple layers can be done simultaneously or consecutively.
- curtain coating, slide coating and slot die coating are preferred.
- the composition may be applied to one side of the support or to both sides of the support.
- At least two of the compositions are applied to the support, e.g. simultaneously or consecutively.
- the compositions may be applied to the same side of the support or to different sides.
- the application step may be performed more than once, either with or without curing being performed between each application.
- the resultant composite membrane may be symmetrical or asymmetrical and the layers of the composition may have the same or different thicknesses.
- a composite membrane may be formed comprising at least one top layer and at least one bottom layer that is closer to the support than the top layer.
- the top layer and bottom layer, together with any intervening layers, constitute the membrane and the porous support provides strength to the resultant composite membrane.
- the composition is applied continuously to a moving support, more preferably by means of a manufacturing unit comprising one or more composition application station(s), one or more irradiation source(s) for curing the composition, a membrane collecting station and a means for moving the support from the composition application station(s) to the irradiation source(s) and to the membrane collecting station.
- a manufacturing unit comprising one or more composition application station(s), one or more irradiation source(s) for curing the composition, a membrane collecting station and a means for moving the support from the composition application station(s) to the irradiation source(s) and to the membrane collecting station.
- composition application station(s) may be located at an upstream position relative to the irradiation source(s) and the irradiation source(s) is/are located at an upstream position relative to the membrane collecting station.
- the composition has a viscosity below 5000mPa.s when measured at 35°C, more preferably from 1 to 1500mPa.s when measured at 35°C. Most preferably the viscosity of the composition is from 2 to 500mPa.s when measured at 35°C. For coating methods such as slide bead coating the preferred viscosity is from 2 to 150mPa.s when measured at 35°C.
- the composition may be applied to a support moving at a speed of over 5m/min, preferably over 10m/min, more preferably over 15m/min, e.g. more than 20m/min, or even higher speeds, such as 60m/min, 120m/min or up to 400m/min can be reached.
- Curing is preferably performed by radical polymerisation, preferably using electromagnetic radiation.
- the source of radiation may be any source which provides the wavelength and intensity of radiation necessary to cure the composition.
- a typical example of a UV light source for curing is a D-bulb with an output of 600 Watts/inch (240 W/cm) as supplied by Fusion UV Systems.
- Alternatives are the V-bulb and the H-bulb from the same supplier.
- the composition can be cured by electron-beam exposure, e.g. using an exposure of 50 to 300 keV. Curing can also be achieved by plasma or corona exposure.
- the components (i) and (ii) (when present) polymerise to form a polymeric membrane.
- the curing may be brought about by any suitable means, e.g. by irradiation and/or heating.
- curing occurs sufficiently rapidly to form a membrane within 30 seconds. If desired further curing may be applied subsequently to finish off, although generally this is not necessary.
- the curing is preferably achieved thermally (e.g. by irradiating with infrared light) or, more preferably, by irradiating the composition with ultraviolet light or an electron beam.
- the composition preferably comprises one or more thermally reactive free radical initiators, preferably being present in an amount of 0.01 to 5 parts per 100 parts of curable composition, wherein all parts are by weight.
- thermally reactive free radical initiators include organic peroxides, e.g. ethyl peroxide and/or benzyl peroxide; hydroperoxides, e.g. methyl hydroperoxide, acyloins, e.g. benzoin; certain azo compounds, e.g. ⁇ , ⁇ '- azobisisobutyronitrile and/or y,y'-azobis(y-cyanovaleric acid); persulfates; peracetates, e.g. methyl peracetate and/or tert-butyl peracetate; peroxalates, e.g.
- dimethyl peroxalate and/or di(tert-butyl) peroxalate e.g. dimethyl peroxalate and/or di(tert-butyl) peroxalate
- disulfides e.g. dimethyl thiuramdisulfide
- ketone peroxides e.g. methyl ethyl ketone peroxide.
- Temperatures in the range of from about 30°C to about 150°C are generally employed for infrared curing. More often, temperatures in the range of from about 40°C to about 1 10°C are used.
- Preferably curing of the composition begins within 3 minutes, more preferably within 60 seconds, after the composition has been applied to the support.
- the curing is achieved by irradiating the composition for less than 30 seconds, more preferably less than 10 seconds, especially less than 3 seconds, more especially less than 2 seconds.
- the irradiation occurs continuously and the speed at which the composition moves through the beam of irradiation is mainly what determines the time period of curing.
- the curing uses ultraviolet light. Suitable wavelengths are for instance UV-A (390 to 320nm), UV-B (320 to 280nm), UV-C (280 to 200nm) and UV-V (445 to 395nm), provided the wavelength matches with the absorbing wavelength of any photo-initiator included in the curable composition.
- Suitable sources of ultraviolet light are mercury arc lamps, carbon arc lamps, low pressure mercury lamps, medium pressure mercury lamps, high pressure mercury lamps, swirlflow plasma arc lamps, metal halide lamps, xenon lamps, tungsten lamps, halogen lamps, lasers and ultraviolet light emitting diodes.
- Particularly preferred are ultraviolet light emitting lamps of the medium or high pressure mercury vapour type. In most cases lamps with emission maxima between 200 and 450nm are particularly suitable.
- the energy output of the irradiation source is preferably from 20 to 1000 W/cm, preferably from 40 to 500 W/cm but may be higher or lower as long as the desired exposure dose can be realized.
- the exposure intensity is one of the parameters that can be used to control the extent of curing which influences the final structure of the membrane.
- the exposure dose is at least 40mJ/cm 2 , more preferably between 40 and 1500mJ/cm 2 , most preferably between 70 and 900mJ/cm 2 as measured by a High Energy UV Radiometer (UV PowerMapTM from EIT, Inc) in the UV-A and UV-B range indicated by the apparatus.
- Exposure times can be chosen freely but preferably are short and are typically less than 10 seconds, more preferably less than 5 seconds, especially less than 3 seconds, more especially less than 2 seconds, e.g. between 0.1 and 1 second.
- more than one UV lamp may be used, so that the composition is irradiated more than once.
- all lamps may give an equal dose or each lamp may have an individual setting.
- the first lamp may give a higher dose than the second and following lamps or the exposure intensity of the first lamp may be lower. Varying the exposure dose of each lamp may influence the polymer matrix structure and the final crosslink density.
- the composition is cured by simultaneous irradiation from opposite sides using two or more irradiation sources, e.g. two lamps (one at each side).
- the two or more irradiation sources preferably irradiate the composition with the same intensity as each other.
- Photoinitiators may be included in the composition, as mentioned above, and are usually required when curing uses UV or visible light radiation. Suitable photoinitiators are those known in the art.
- Curing is preferably performed at between 20 and 60°C. While higher temperatures may be used, these are not preferred because they can lead to higher manufacturing costs.
- Preferred supports are porous, e.g. they may be a woven or non-woven synthetic fabric, e.g. polyethylene, polypropylene, polyacrylonitrile, polyvinyl chloride, polyester, polyamide, and copolymers thereof, or porous membranes based on e.g.
- porous supports are available from a number of sources, e.g. from Freudenberg Filtration Technologies (Novatexx materials) and Sefar AG.
- the present process allows the preparation of membranes having a desirable degree of flexibility, without being overly flexible or too rigid.
- the compositions can provide thin membranes with low numbers of defects, low tendency to curl while retaining good durability in use.
- a membrane obtained by a process according to the second aspect of the present invention.
- the membranes according to the third aspect of the present invention may also be put to other uses requiring membranes having anionic groups.
- the membranes according to the third aspect of the present invention preferably have the properties described above in relation to the second aspect of the present invention.
- a membrane according to the first or third aspect of the present invention for the separation or purification of liquids, vapours or gases.
- the membranes of the invention are particularly useful for water purification, the generation of electricity etc. for example in ED, (C)EDI, EDR, FTC, ZLD, ZDD or RED, although they may also be used for other purposes.
- an electrodialysis or reverse electrodialysis unit a flow through capacitor device, an electrodeionization module, a continuous electrodeionization module, a fuel cell, a diffusion dialysis apparatus, a membrane distillation module or a membrane electrode assembly comprising one or more polymeric membranes according to the present invention.
- the electrodialysis or reverse electrodialysis unit or the electrodeionization module or the flow through capacitor comprises at least one anode, at least one cathode and one or more membranes according to the first or third aspect of the present invention.
- the unit preferably comprises an inlet for providing a flow of water having a relatively high salt content along a first side of a membrane according to the present invention and an inlet for providing a flow of water having a relatively low salt content along a second side of the membrane such that ions pass from the first side to the second side of the membrane.
- the one or more membranes of the unit comprise a membrane according to the first or third aspect of the present invention having anionic groups and a further membrane having cationic groups.
- the unit comprises at least 3, more preferably at least 5, e.g. 36, 64 or up to 500 or even 1000, membranes according to the first or third aspect of the present invention, the number of membranes being dependent on the application.
- the membrane may for instance be used in a plate-and-frame or stacked-disk configuration or in a spiral-wound design.
- a continuous first membrane according to the present invention having anionic groups may be folded in a concertina (or zigzag) manner and a second membrane having cationic groups (i.e. of opposite charge to the first membrane) may be inserted between the folds to form a plurality of channels along which fluid may pass and having alternate anionic and cationic membranes as side walls.
- PS Permselectivity
- Two cells were separated by the membrane under investigation. Prior to the measurement the membrane was equilibrated in a 0.1 M NaCI solution for at least 12 hours. Two streams having different NaCI concentrations were passed through cells on opposite sides of the membranes under investigation. One stream had a concentration of 0.1 M NaCI (from Sigma Aldrich, min. 99.5% purity) and the other stream was 0.5 M NaCI. The flow rate of both streams was 0.90dm 3 /min.
- Two Calomel reference electrodes (from Metrohm AG, Switzerland) were connected to Haber-Luggin capillary tubes that were inserted in each cell and were used to measure the potential difference over the membrane. The effective membrane area was 3.14 cm 2 and the temperature was 21 °C.
- a (%) AV meas / AVtheor * 100%.
- the theoretical membrane potential (AVtheor) is the potential for a 100% permselective membrane as calculated using the Nernst equation.
- ER Electrical resistance
- auxiliary membranes were CMX and AMX from Tokuyama Soda, Japan;
- the effective area of the membrane was 3.14 cm 2 .
- the membrane strength was determined by the following method which measured the amount of membrane which broke off as a result of an ultrasonic treatment.
- a dry 0.45 ⁇ filter from Millipore was acclimatised to ambient conditions for 1 hour and then weighed accurately (W1 ).
- the dry membrane under test (800 cm 2 ) was acclimatised to ambient conditions for 1 hour and then weighed to give W mem brane, cut into pieces, placed in a beaker containing water (200cm 3 ) and the beaker was placed in a Branson 8210 ultrasonic bath for 99 minutes. After this treatment the water was decanted off the pieces and filtered through the abovementioned filter.
- the pieces were carefully rinsed with water at 40°C to remove any pieces of membrane broken off by the ultrasonic treatment, and the washings were also filtered, taking care to retain intact membrane in the beaker.
- the filter (including any broken off pieces of membrane) was dried at 30°C in a vacuum oven overnight and then weighed after acclimatizing it for an hour under the same conditions as the filter had been acclimatized prior to the filtration (W2).
- the % weight loss (which is inversely proportional to membrane strength) arising from ultrasonic treatment was calculated as follows:
- % Weight lOSS 100% X (W2-W1 )/W me mbrane A low weight loss indicates a strong membrane and a high weight loss indicates a weak membrane.
- pH measurements were performed using a Metrohm 691 pH meter equipped with a Metrohm 6.0228.000 electrode, calibrated at 20 °C with standard buffers of pH 4 and 7.
- CD is the calculated crosslink density in mmol/g and IEC is the calculated ion exchange capacity in meq/g (both calculated as described above).
- MF is the molar fraction of curable compounds comprising at least two (meth)acrylic groups, relative to the total number of moles of curable compounds present in the composition (calculated as described above),
- BAMPS - is 1 ,1 -bis(acryloylamido)-2-methylpropane-2-sulphonic acid, synthesized as described in US 4,034,001 (a curable compound comprising at least two (meth)acrylic groups and a sulphonic acid group), having a molecular weight of 276.3.
- MBA - is ⁇ , ⁇ '-methylene bisacrylamide from Sigma Aldrich (a curable compound comprising at least two (meth)acrylic groups and being free from sulphonic acid groups), having a molecular weight of 154.2.
- AMPS - is 2-Acryloylamido-2-nnethylpropanesulfonic acid from Hang-Zhou (China) (a curable compound having one ethylenically unsaturated group), having a molecular weight of 207.2.
- BAHP - is 1 ,4-bis(acryloyl) homopiperazine, synthesized as described in WO2010/106356 (a curable compound comprising at least two (meth)acrylic groups and being free from sulphonic acid groups), having a molecular weight of 208.
- IPA- is 2-propanol from Shell.
- GenoradTM - is a polymerization inhibitor.
- DarocurTM 1 173 - is a photoinitiator.
- NovatexxTM 2226-14E - is a nonwoven polypropylene/polyethylene material from Freudenberg Filtration Technologies.
- compositions Ex 1 to Ex 7 and comparative compositions CE1 to CE7 were prepared by mixing the ingredients expressed as wt% shown in Tables 1 and 2.
- compositions were applied to an aluminium underground carrier using a 150 m wire wound bar, at a speed of approximately 5 m/min, by hand, followed by application to a non-woven support (NovatexxTM 2226-14E) levelled using a 4 micrometer wire wound rod coater.
- the temperature of the compositions was 20-60°C.
- a membrane was prepared by curing the coated support using a Light
- the membrane was stored in a 0.1 M NaCI solution for at least 12 hours.
- ER value higher than 10 is considered too high for most applications; the ER is preferably below 5 ohm.cm 2 .
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Abstract
Description
Claims
Priority Applications (10)
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ES12738586T ES2697608T3 (en) | 2011-07-19 | 2012-07-05 | Membranes manufactured from curable compositions |
CA2842115A CA2842115C (en) | 2011-07-19 | 2012-07-05 | Curable compositions and membranes |
KR1020147003935A KR101950500B1 (en) | 2011-07-19 | 2012-07-05 | Curable compositions and memebranes |
CN201280035834.5A CN103687664B (en) | 2011-07-19 | 2012-07-05 | Curable compositions and film |
EP12738586.2A EP2734291B1 (en) | 2011-07-19 | 2012-07-05 | Membranes made from curable compositions |
AU2012285539A AU2012285539B9 (en) | 2011-07-19 | 2012-07-05 | Curable compositions and membranes |
JP2014520715A JP5977823B2 (en) | 2011-07-19 | 2012-07-05 | Curable composition and film |
US14/233,166 US9675940B2 (en) | 2011-07-19 | 2012-07-05 | Curable compositions and membranes |
IL230469A IL230469A0 (en) | 2011-07-19 | 2014-01-15 | Curable compositions and membranes |
US15/595,203 US10279319B2 (en) | 2011-07-19 | 2017-05-15 | Curable compositions and membranes |
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GBGB1112382.5A GB201112382D0 (en) | 2011-07-19 | 2011-07-19 | Curable compositions and membranes |
GB1112382.5 | 2011-07-19 |
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US15/595,203 Continuation US10279319B2 (en) | 2011-07-19 | 2017-05-15 | Curable compositions and membranes |
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EP (1) | EP2734291B1 (en) |
JP (1) | JP5977823B2 (en) |
KR (1) | KR101950500B1 (en) |
CN (1) | CN103687664B (en) |
AU (1) | AU2012285539B9 (en) |
CA (1) | CA2842115C (en) |
ES (1) | ES2697608T3 (en) |
GB (1) | GB201112382D0 (en) |
IL (1) | IL230469A0 (en) |
WO (1) | WO2013011272A1 (en) |
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-
2011
- 2011-07-19 GB GBGB1112382.5A patent/GB201112382D0/en not_active Ceased
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2012
- 2012-07-05 JP JP2014520715A patent/JP5977823B2/en active Active
- 2012-07-05 AU AU2012285539A patent/AU2012285539B9/en not_active Ceased
- 2012-07-05 CA CA2842115A patent/CA2842115C/en active Active
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Also Published As
Publication number | Publication date |
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CA2842115C (en) | 2020-11-10 |
KR20140059780A (en) | 2014-05-16 |
CN103687664A (en) | 2014-03-26 |
CN103687664B (en) | 2016-05-11 |
IL230469A0 (en) | 2014-03-31 |
JP5977823B2 (en) | 2016-08-24 |
US10279319B2 (en) | 2019-05-07 |
US9675940B2 (en) | 2017-06-13 |
AU2012285539B2 (en) | 2017-03-09 |
ES2697608T3 (en) | 2019-01-25 |
CA2842115A1 (en) | 2013-01-24 |
EP2734291B1 (en) | 2018-09-19 |
AU2012285539B9 (en) | 2017-04-06 |
KR101950500B1 (en) | 2019-04-22 |
US20170246594A1 (en) | 2017-08-31 |
GB201112382D0 (en) | 2011-08-31 |
EP2734291A1 (en) | 2014-05-28 |
JP2014526959A (en) | 2014-10-09 |
US20150290594A1 (en) | 2015-10-15 |
AU2012285539A1 (en) | 2014-02-06 |
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