Patent Application
20080319097
All patent and non-patent references cited in the application are hereby incorporated by reference in their entirety.
The present invention relates to polymer resins, methods for their generation and uses thereof. In one aspect the present invention is directed to a resin obtainable by aminolysis of a precursor resin, wherein the precursor resin is obtainable by polymerisation of i) polydisperse di- or oligofunctional vinyl or cyclic ether compounds and ii) aminolytically sensitive, mono-functional vinyl or cyclic ether compounds.
Traditionally, polystyrene-divinylbenzene (PS-DVB) has been used as a support for solid phase chemistry because of its high thermal stability, chemical inertness, and mechanical robustness. However, the limited swelling of PS-DVB supports in polar media can limit reagent accessibility and prevent chemical applications in which complete solvation of the polymer matrix is essential for reactivity.
Although increased swelling in polar solvents can be achieved by grafting polyethylene glycol (PEG) to chloromethylated PS-DVB, the resulting PEG-grafted PS-DVB supports such as TentaGel™ (Rapp Polymere GmbH; Tubingen, Germany) and ArgoGel™ (Argonault Technologies; San Carlos, Calif.) have limitations for use in aqueous solvents and for enzymatic chemistry.
Several PEG-based resins exhibit high swelling volumes in both non-polar solvents and water. These resins include, for example, polyoxyethylene-polyoxypropylene (POEPOP), SPOCC (Superior Polymer for Organic Combinatorial Chemistry, a polymer formed by cationic polymerization of a mixture of mono- and bis-oxetanylated PEG macromonomers), and polyoxyethylene-polystyrene (POEPS).
There is a need for improved and cost effective resins for e.g. chromatography and for solid phase organic synthesis reactions in both aqueous and organic media.
In one aspect of the invention there is provided a resin comprising a polymer matrix comprising a plurality of functional groups, wherein the functional polymer matrix is obtainable by aminolysis of a precursor resin using an functional amine comprising a functional moiety, wherein the precursor resin is obtainable by polymerisation of a well defined mixture of i) cross-link monomers having two or more polymerizable groups such as vinyl or cyclic ether groups and ii) aminolytically sensitive monomer, comprising of one polymerizable group such as a vinyl or a cyclic ether group and an aminolytical sensitive group.
There is also provided a method for the synthesis of the above-mentioned resin, as well as uses thereof.
The drawing in
‘Cross-link monomers’ are defined as macromonomers having two or more polymerizable groups such as vinyl or strained cyclic ether groups. ‘Aminolytically sensitive monomers’ are defined as monomers having a group sensitive to aminolytical substitution and one polymerizable group such as a vinyl or a strained cyclic ether group. ‘Functional amines’ are defined as substituted, primary or secondary amines comprising one or more reactive chemical functional groups.
In one aspect of the invention there is provided a resin comprising a polymer matrix comprising a plurality of functional groups, wherein the functional polymer matrix is obtainable by aminolysis of a precursor resin using ‘functional amines’, wherein the precursor resin is obtainable by polymerisation of a well defined mixture of i) ‘cross-link monomers’ comprising of two or more polymerizable groups, such as vinyl or cyclic ether compounds and ii) ‘aminolytically sensitive monomers’. comprising of one polymerizable group, such as a vinyl or a cyclic ether group, and an aminolytical sensitive group.
The polymerisation of the cross-link monomers and the aminolytical sensitive monomers can occur in the presence or absence of an extension monomer. Preferably, in some embodiments, the chain extension monomer is present during the above-mentioned polymerisation.
The chain extension monomer can comprise or consist of a reactive vinyl compound, such as e.g. a methacrylate ester, an acrylamide, a styrene, a vinyl chloride, a vinyl acetate, a N-vinylpyrrolidone, a N-vinylcaprolactone, a vinyl ether, an allyl ether or an acrylonitrile or a strained cyclic ether such as a substituted oxirane or a substituted oxethane.
Apart from a chain extension monomer, the polymerisation can also occur in the presence of a radical or an ionic initiator. The polymerization can further occur in the presence of an oligofunctional starter molecule, such as glycerol, trimethylolethane, trimethylolpropane, pentaerythritol di-trimethylolpropane, di-pentaerythritol.
The cross-link monomers can comprise or consist of polyalkylene glycols substituted with vinyl compounds or strained cyclic ethers, such as di- or oligofunctional polyalkylene glycols vinyl compounds comprising an amide, such as a diamide, or a polyamide, or mixtures thereof.
The cross-link monomers are preferably selected from vinyl-substituted terminally aminated polyalkylene glycols based on ethylene oxide or propylene oxide, or mixtures thereof. In another preferred embodiment the cross-link monomers selected from cyclic ether substituted polyalkylene glycols based on ethylene oxide or propylene oxide, or mixtures thereof.
When the vinyl substituted cross-link monomers comprise an amide, the amide can be e.g. a 1,ω-diamide oligomer or polymer derived from a diamine and a dicarboxylic acid, or derived from a diamine and an amino acid, or an oligoaminoacid, or a polyaminoacid.
The diamine of the vinyl substituted cross-link monomers can be e.g. ethylendiamine, propylenediamine, butylenediamine, pentylenediamine, hexylenediamine, diaminododecane, piperazine, ethyleneoxide derived amines such as 1,5-diamino-3-oxapentane, 1,8-diamino-3,6-dioxaoctane, 1,11-diamino-3,6,9-trioxaundecane, polyamines such as polyethyleneimes for example triethyleneimine; piperazinoethylamine, spermine, spermidine; or a Jeffamine D-230, D-400, D-2000, XTJ-510, XTJ-502, HK-511, XTJ-500, T-403, XTJ-509, T-5000 or a diprimary amine (DPA) such as DPA-3PG, or DPA-425, DPA-725, DPA-1000, DPA-1200, DPA-2000, DPA-4000, DPA-300E, DPA-400E, and DPA-1000E, including any mixture thereof.
The dicarboxylic acid can be e.g. oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, dodecanoic acid, diglycolic acid, tartaric acid, citric acid, phthalic acid, or trimellitic acid.
Examples of suitable aminoacids, oligoaminoacids, and polyaminoacids are glycine, alanine, 4-aminobutanoic acid, 6-aminobutanoic acid, 12-aminododecanoic acid, and 4-aminobenzoic acid, including oligomers and polymers thereof.
The vinyl compounds can in some embodiments comprise an acrylamide function, or a methacrylamide function, or an ethacrylamide function.
The molecular weight of the cross-link monomers are preferably in the range of from 200 to 10000, such as from 200 to 1000, for example from 1000 to 4000, such as from 4000 to 10000.
The cross-link monomers can comprise allyl ethers of polymers of ethylene oxide or propylene oxide, including mixtures thereof. The allyl ethers can be e.g. polydisperse polyethyleneoxide diallyl ethers having a molecular weight of from 200 to 10000, such as from 200 to 1000, for example from 1000 to 4000, such as from 4000 to 10000.
Examples of allyl ethers include, but are not limited to, PEG200 diallyl ethers, PEG400 diallyl ethers, PEG600 diallyl ethers, PEG800 diallyl ethers, ethoxylated trimethylolpropane allyl ethers, and ethoxylated pentaerythritol allyl ethers, including any combination thereof.
The cross-link monomers can comprise oxirane substituted polymers of ethylene oxide or propylene oxide, including mixtures thereof. The substituted polymers can be e.g. polydisperse polyethyleneoxide diglycidyl ethers having a molecular weight of from 200 to 10000, such as from 200 to 1000, for example from 1000 to 4000, such as from 4000 to 10000.
Examples of diglycidyl ethers include, but is not limited to, PEG200 diglycidyl ether, PEG400 diglycidyl ether, PEG800 diglycidyl ether, PEG1000 diglycidyl ether, ethoxylated trimethylolpropane glycidyl ether, and ethoxylated pentaerythritol glycidyl ether, including any combination thereof.
The cross-link monomers can comprise oxetane substituted polymers of ethylene oxide or propylene oxide, including mixtures thereof. The substituted polymers can be e.g. polydisperse polyethyleneoxide di 3-methyl-oxetane-3-methanoyl-ethers having a molecular weight of from 200 to 10000, such as from 200 to 1000, for example from 1000 to 4000, such as from 4000 to 10000.
Examples of polyalkylene oxide dioxetanes include, but are not limited to, PEG200 di 3-methyl-oxetane-3-methanoyl-ethers ether, PEG400 di 3-methyl-oxetane-3-methanoyl-ethers ether, PEG800 di 3-methyl-oxetane-3-methanoyl-ethers ether, PEG2000 di 3-methyl-oxetane-3-methanoyl-ethers ether, PEG-PPG-PEG2000 copolymer di 3-methyl-oxetane-3-methanoyl-ethers ether, including any combination thereof.
The ‘Aminolytically sensitive monomers’ can be selected from the group consisting of acrylate esters, maleate esters, fumarate esters, maleic anhydride, acrylamides and chloromethyl styrene, including any combination thereof or glycidyl or oxetane esters comprising esterfunctionalities. The acrylamides can be e.g. acrylamide, methyl acrylamidoacetate or acrylonitrile, including combinations thereof. The acrylate esters can comprise or consist of an acrylate selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, hydroxylethyl acrylate, hydroxypropyl acrylate, glycerol acrylate, a PEG acrylate such as diethylene glycol acrylate, triethyleneglycol acrylate, tetraethylenglycol acrylate, pentaethyleneglycol acrylate, hexaethyleneglycol acrylate, heptaethyleneglycol acrylate, octaethyleneglycol acrylate, nonaethylenglycol acrylate, and decaethyleneglycol acrylate, including any combination thereof. The maleate esters can comprise or consist of a maleate selected from the group consisting of methyl maleate or ethyl maleate, and butyl maleate, including any combination thereof. The fumarate esters can comprise or consist of a fumarate selected from the group consisting of methyl fumarate or ethyl fumarate, or a combination thereof.
The reactive vinyl compound of the chain extension monomer can comprise or consist of a reactive vinyl compound, such as e.g. methacrylate esters, such as methyl methacrylate or ethyl methacrylate, or comprise or consist of an acrylamide, such as N-methylacrylamide or N,N-dimethylacrylamide, or comprise or consist of styrene, or comprise or consist of vinyl chloride, or comprise or consist of vinyl acetate, or comprise or consist of N-vinylformamide, or comprise or consist of N-vinylpyrrolidone, or comprise or consist of N-vinylcaprolactone, or comprises or consists of a vinyl ether, or comprises or consists of an allyl ether, or comprise or consist of acrylonitrile.
The functional amine used in the aminolysis of the precursor resin can be a primary amine or a secondary amine, or a mixture thereof.
The functional amine can be illustrated by the general formula RR′NH, wherein R and R′ can be identical or non-identical. In one embodiment, R and R′ are preferably independently selected from the group consisting of hydrogen, aliphatic radicals, aromatic radicals, wherein said radicals are optionally substituted with one or more heteroatoms such as nitrogen, oxygen and sulphur. In another embodiment, R and R′ are independently selected from methyl, ethyl, propyl, cyclohexyl, benzyl or substituted benzyl such as p-methoxybenzyl or p-nitrobenzyl, phenyl or substituted phenyl such as p-methoxyphenyl or p-nitrophenyl.
In a further embodiment, RR′NH is selected from the group consisting of amino acids and amino acid derivatives, such as glycine, lysine or phenylalanine; carbohydrate amines or derivatives thereof such as glucosamine, galactosamine; chiral amines such as amphetamine, alkaloids, diamines such as ethylendiamine, propylenediamine, butylenediamine, pentylenediamine, hexylenediamine, diaminododecane, piperazine, aminopyridine, ethyleneoxide or propyleneoxide derived amines such as 1,5-diamino-3-oxapentane, 1,8-diamino-3,6-dioxaoctane, 1,11-diamino-3,6,9-trioxaundecane, polyamines such as polyalkyleneimines for example triethyleneimine; piperazinoethylamine, spermine, spermidine; aminocrown ethers, hydrazines such as hydrazine, hydroxylamines such as hydroxylamine, oligoamines such as 1,4,7-triamino heptane, 1,4,7,10-tetramino decane, 1,4,7,10,13-pentamino tridecane, including any combination thereof.
In one embodiment the ethyleneoxide or propyleneoxide based amines are commercially available alkylglycol amines such as DPA-PG, DPA-2PG, DPA-3PG, NDPA-10, DPA-DEG, DPA-PEG200, NDPA-11, DPA-12, IDPA-12, NDPA12, APDEA, APDIPA from Tomah, or Jeffamines HK511, EDR-148, D230, and T-403.
There is also provided a method for generating a precursor resin for a polymer matrix obtainable by aminolysis of said precursor resin, wherein said precursor resin is obtainable by polymerisation of i) polydisperse di- or oligofunctional vinyl compounds and ii) aminolytically sensitive, mono-functional vinyl compounds, said method comprising the steps of
providing at least one polydisperse cross-link monomer,
providing at least one aminolytically sensitive, monomer,
optionally providing a chain extension monomer,
further optionally providing an initiator of polymerization and/or a surface active agent,
polymerizing the provided monomer compounds under radical or ionic polymerisation conditions,
optionally beading the polymerized vinyl compounds in a batch or continuous process, wherein said beading is catalysed by a radiation initiator or a thermally cured initiator, and
obtaining a cross-linked and optionally beaded precursor resin of the polymer matrix according to the invention.
The reaction temperature can be anything suitable, typically it is in the range of from −20° C. to 150° C., such as from 20° C. to 100° C., preferably from 40° C. to 80° C.
The reaction can be run in the presence of a solvent such as water, methanol, ethanol, ethylene glycol, N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, or acetonitrile, or a polyethyleneglycol, such as diethylene glycol, triethylene glycol, tetraethylene glycol, an ethyleneglycol ether such as ethyleneglycol dimethyl ether, diethyleneglycol dimethyl ether, triethyleneglycol dimethyl ether, tetraethyleneglycol dimethyl ether, or an ester such as methyl formate or dimethyl carbonate.
The concentration of the reactants in the reaction solution is typically from about 5% (v/v) to 100% (v/v), such as from 10 to 80%, for example from 20 to 60%.
The stirring frequency can be anything suitable, such as e.g. from 10 to 2000 rpm, for example from 50 to 1000 rpm, such as from 100 to 600 rpm.
The method can comprise the further step of providing a surface active agent, and/or a solvent, and/or a non-miscible phase to the reaction mixture, and reacting the reaction mixture under stirring or ultrasonification conditions allowing bead formation and cross-linking.
The non-miscible liquid is a petroleum fraction, an aliphatic oil, a natural fat or triglyceride, an aromatic solvent such as toluene or xylene, a halogenated solvent such as methylene chloride, chloroform, carbon tetrachloride, dichloroethane, trichloroethylene, chlorobenzene, a fluorinated solvent, or mixtures thereof.
The ratio of the reactive phase and the non-miscible liquid can be from 2:1 to 1:100, such as from 4:5 to 1:75, for example from 1:2 to 1:30.
The initiator for the polymerization of vinyl or oxirane polymerizable groups can comprise or consist of a radical polymerization initiator selected from the group consisting of a peroxide, such as ammonium peroxodisulfate or tetrabutylammonium peroxodisulfate, a hydroperoxide, such as t-butylhydroperoxide, an azo compound, such as azoisobutyronitrile, a mixed initiator system, such as a mixture of ammonium peroxidisulphate and sodium disulfite; or ammonium peroxodisulfite and N,N,N N′-tetramethyldiaminoethane; or ammonium peroxodisulfate, N,N,N N′-tetramethyldiaminoethane, and sodium disulfite; or potassium bromate, ethylenetetraacetic acid, and copper sulfate. The initiator for the polymerization of oxethane or oxirane polymerizable groups can comprise or consist of Lewis acids, such as BF3etherates, BF3, TiCl4 or a photogenerated cationic initiator. In addition the initiator for the oxirane polymers can comprise or consist of an anionic initiator such as sodium methoxide, sodium ethoxide, potassium butoxide, and potassium tert-butoxide.
The surface active agent can comprise or consist of an agent selected from the group consisting of
negatively charged surface active agents such as sodium laurate, sodium laurylsulfate, sodium laurylsulfonate, sodium decylbenzenesulfonate,
neutral surface active agents such as ethoxylated aliphatic alcohols, ethoxylated alkylphenols, alkylphenols, ethoxylated fattyacid derivaties, carbohydrate derived esters, e.g., sorbitan laurate, amphiphilic polymers such as copolymers of polyethylene glycol methacrylate and lauryl acrylare or silylalkyl methacrylate or copolymers of ethylene oxide and propylene oxide, and
positively charged surface active agents such as hexadecyltrimethylammonium bromide, tetraheptylammonium chloride, or tetrabutylammonium bromid.
There is also provided a method for aminolysis of a precursor resin, said method comprising the steps of
providing a cross-linked precursor resin with aminolytically active sites,
reacting said precursor resin under aminolytical conditions, optionally in the presence of a solvent and further optionally in the presence of a catalyst, and
obtaining a cross-linked and functionalised polymer matrix according to the invention.
In addition, the treatment of the precursor resin under aminolytical conditions may result in a reinforced cross-linked polymer network structure, possessing improved mechanical strength properties.
The precursor resin can be treated with functional amine at a molar ratio of amine:aminolytically active groups of from 1000 to 0.01, such as from 100 to 1, for example from 10 to 2.
The temperature for the reaction is typically in the range of from minus 20° C. to 200° C., such as from 20° C. to 150° C., for example from 40° C. to 120° C.
The aminolysis can occur in the presence of a catalyst, such as a basic salt, for example sodium methoxide, potassium tert-butoxide, sodium hydroxide, potassium hydroxide, sodium carbonate, caesium hydroxide, or nuclephilic salts such as sodium cyanide, or a tertiary amine such as dimethylaminopyridin, diazobicyclononen or diazobicycloundecen.
The aminolysis can occur in a solvent, such as water; or an alcohol, such as methanol, ethanol, propanol, ethylene glycol or ethoxyethanol; or an amide, such as dimethylformamide; or a sulfoxide, such a DMSO, or an aromatic solvent such as toluene or anisole; or a nitrile, such as acetonitrile, or mixtures thereof.
There is provided the following uses of the present invention:
Use of the polymer matrix according to the invention for scavenging undesirable chemical compounds, preferably carbonyl and/or sulfonyl compounds, from a composition comprising a mixture of chemical entities. The carbonyl or sulfonyl compounds can be selected from the group of compounds consisting of organic acids, acid chlorides, sulfonyl chlorides, ketones, aldehydes, and derivatives thereof. Alternatively, the polymer matrix find use in brewing processes for improving products by preventing haze formation.
There is also provided:
Use of the polymer matrix according to the invention as support for the synthesis of an organic molecule.
Use of the polymer matrix according to the invention as support when generating a combinatorial chemistry library.
Use of the polymer matrix according to the invention as a support for the synthesis of a drug molecule, a peptide, a protein, DNA, or RNA.
Use of the polymer matrix according to the invention as support for solid phase enzyme reactions.
Use of the polymer matrix according to the invention for immobilisation of biomolecules, such as proteins, enzymes, or other biochemically active entities.
Use of the polymer matrix according to the invention for chromatographic separation or purification of desirable target compounds including affinity purification and desalting.
Use of the polymer matrix according to the invention as a pharmacologically active macromolecule.
Use of the polymer matrix according to the invention as a depot for physiologically active molecules.
Use of the polymer matrix according to the invention as an in vivo degradable entity.
The beaded polymer resin was prepared by an inverse suspension polymerization method. To a flask containing 10 g of water, 0.81 g bisacrylolated Jeffamine ED-900 having a molecular weight of ˜1100 g/mol and 4.19 g Bisomer PEA6 (Mn=336 g/mol) were added. The reaction mixture was subjected to N2 for 15 minutes, whereafter 0.30 g ammonium persulfate was dissolved into the solution. To a three-necked baffled flask, equipped with a mechanical stirrer, 100 ml of paraffin oil and 0.050 g of a surfactant were added and heated to 70° C. The reaction mixture was then added to the oil forming a suspension of beads. After approximately 1 minute of reaction time, 0.569 ml of 1,2-Di-(dimethylamino)-ethane was injected to suspension mixture. The chemical synthesis, i.e. network formation, was performed at 70° C. for 20 h. After the synthesis, the resulting beads were filtrated from the oil phase. The beads were then sequentially washed with dichloromethane, tetrahydrofurane, methanol and water to remove by-products and oil. The degree of hydroxyl functionality (hydroxyl capacity, loading) was analysed to 2.1 mol/kg. The swelling performance in water was determined to 5.7 ml/g.
To 2.5 g resin (swelled in water), produced according to example 1, 5 ml of triethyleneglycol diamine was added at room temperature, followed by the addition of 0.0046 g of potassium tert-butoxide. The reaction mixture was stirred for 20 h at a temperature of 120° C. The resin was then washed with water and ethanol to remove residuals. The degree of amine functionality (amine capacity, loading) was analyzed to 2.2 mol/kg. The swelling performance in water was determined to 10.8 ml/g.
The beaded polymer resin was prepared by an inverse suspension polymerization method. To a flask containing 15 g of water, 1.2 g bisacrylolated Jeffamine ED-2003 having a molecular weight of ˜2050 g/mol and 3.76 g Bisomer PEA6 (Mn=336 g/mol) were added. The reaction mixture was subjected to N2 for 15 minutes, whereafter 0.328 g ammonium persulfate was dissolved into the solution. To a three-necked baffled flask, equipped with a mechanical stirrer, 100 ml of paraffin oil and 0.050 g of a surfactant were added and heated to 70° C. The reaction mixture was then added to the oil forming a suspension of beads. After approximately 1 minute of reaction time, 0.621 ml of 1,2-Di-(dimethylamino)-ethane was injected to suspension mixture. The chemical synthesis, i.e. network formation, was performed at 70° C. for 20 h. After the synthesis, the resulting beads were filtrated from the oil phase. The beads were then sequentially washed with dichloromethane, tetrahydrofurane, methanol and water to remove restproducts and oil. The degree of hydroxyl functionality (hydroxyl capacity, loading) was analyzed to 2.0 mol/kg. The swelling performance in water was determined to 7.3 ml/g.
To 22 g resin (swelled in water), produced according to example 3, 108 ml of triethyleneglycol diamine was added at room temperature, followed by the addition of 0.066 g of potassium tert-butoxide. The reaction mixture was stirred for 20 h at a temperature of 120° C. The resin was then washed with water and ethanol to remove residuals. The degree of amine functionality (amine capacity, loading) was analyzed to 1.8 mol/kg. The swelling performance in water was determined to 12.1 ml/g.
The beaded polymer resin was prepared by an inverse suspension polymerization method. To a flask containing 60 g of water, 21 g bisacrylolated Jeffamine ED-900 having a molecular weight of ˜1100 g/mol and 9 g Bisomer PEA6 (Mn=336 g/mol) were added. The reaction mixture was subjected to N2 for 15 minutes, whereafter 1.67 g ammonium persulfate was dissolved into the solution. To a three-necked baffled flask, equipped with a mechanical stirrer, 600 ml of paraffin oil and 0.30 g of a surfactant were added and heated to 70° C. The reaction mixture was then added to the oil forming a suspension of beads. After approximately 1 minute of reaction time, 3.16 ml of 1,2-Di-(dimethylamino)-ethane was injected to suspension mixture, followed by the addition of 1.24 g sodium bisulfite dissolved in water. The chemical synthesis, i.e. network formation, was performed at 70° C. for 24 h. After the synthesis, the resulting beads were filtrated from the oil phase. The beads were then sequentially washed with dichloromethane, tetrahydrofurane, methanol and water to remove rest products and oil. The degree of hydroxyl functionality (hydroxyl capacity, loading) was analyzed to 0.9 mol/kg. The swelling performance in water was determined to 4.9 ml/g.
To 2.5 g resin (swelled in water), produced according to example 5, 3 ml of ethylene diamine was added at room temperature, followed by the addition of 0.0042 g of potassium tert-butoxide. The reaction mixture was refluxed for 20 h. The resin was then washed with water and ethanol to remove residuals. The degree of amine functionality (amine capacity, loading) was analyzed to 1.0 mol/kg. The swelling performance in water was determined to 5.1 ml/g.
A hydroxyester resin prepared according to example 3 was treated with a 20-fold excess of short bis-aminopropyl-propyleneglycol, Jeffamine D-230 (Huntsmann corporation) at 120° C. for 16 hours. The product was rinsed 5 times with each of the following solvents water, ethanol, dichloromethane and was subsequently dried. Judged from IR, approximately 25% of the ester groups were converted to functional amides.
The swelling of the formed resin were measured by measuring the compacted bed of 100 mg dry resin after swelling in the appropriate solution.
Similar swelling behaviours were obtained when using Jeffamine EDR 148 for the aminolysis.
| Number | Date | Country | Kind |
|---|---|---|---|
| PA 2004 01298 | Aug 2004 | DK | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/DK05/00546 | 8/26/2005 | WO | 00 | 5/30/2008 |
