WO2012083536A1 - 超支化型聚羧酸类共聚物水泥分散剂的制备方法 - Google Patents
超支化型聚羧酸类共聚物水泥分散剂的制备方法 Download PDFInfo
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- WO2012083536A1 WO2012083536A1 PCT/CN2010/080133 CN2010080133W WO2012083536A1 WO 2012083536 A1 WO2012083536 A1 WO 2012083536A1 CN 2010080133 W CN2010080133 W CN 2010080133W WO 2012083536 A1 WO2012083536 A1 WO 2012083536A1
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- polycarboxylic acid
- cement dispersant
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Classifications
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- 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
- C08F228/00—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 bond to sulfur or by a heterocyclic ring containing sulfur
- C08F228/02—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 bond to sulfur or by a heterocyclic ring containing sulfur by a bond to sulfur
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
- C04B24/2647—Polyacrylates; Polymethacrylates containing polyether side chains
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/40—Surface-active agents, dispersants
- C04B2103/408—Dispersants
Definitions
- the invention relates to a preparation method of a hyperbranched polycarboxylic acid copolymer cement dispersant, belonging to the technical field of concrete admixtures. Background technique
- the cement dispersant (water reducing agent) has a function of adsorbing on the cement particles to suppress aggregation of the cement particles and to improve the dispersibility of the concrete during use.
- cement dispersion There are many substances used for cement dispersion, including lignosulfonate, naphthalenesulfonate/formaldehyde polycondensate, phenol/p-aminobenzenesulfonic acid/formaldehyde polycondensate, melamine sulfonate/formaldehyde polycondensate, polycarboxylic acid. Comb-like copolymers and the like.
- the former cement dispersants mainly use sulfonic acid groups as adsorption groups, lacking effective side chains providing steric hindrance, single molecular structure, poor adjustability, limited dispersion of cement, and blending. High volume and low water reduction rate.
- the polycarboxylic acid comb copolymer has the adsorption provided by the main chain rich in carboxyl group adsorption groups, and has the steric hindrance provided by the hydrophilic side chain, which greatly improves the dispersion of cement. .
- polycarboxylate comb copolymers have greatly improved the comonomer and copolymerization technology, but still can not meet the requirements of modern construction engineering for high-performance cement dispersants.
- the development of new structure polycarboxylate copolymers has become a direction to improve the performance of polycarboxylate cement dispersants, such as star structures, hyperbranched structures, dendritic structures, etc. These new structures greatly increase the molecular structure of the polymer.
- the number of adsorbing groups while taking into account the steric hindrance provided by the hydrophilic side chains in the comb structure, thus increasing the dispersion of cement.
- Patent CN101580353 reports a hyperbranched polycarboxylate superplasticizer and a preparation method thereof.
- the preparation method is divided into two steps: First step, using hydrazine, hydrazine-dimethylformamide as a solvent, acrylate, A Sodium propylene sulfonate and allyl polyoxyethylene ether are copolymerized into a polymer backbone.
- azobiscyanovaleric acid is used as an initiator, and a carboxyl group is introduced at the end of the polymer chain.
- the second step the second step is utilized.
- the invention provides a preparation method of a hyperbranched polycarboxylic acid copolymer cement dispersant, which has the advantages of low dosage, good dispersibility, high water reduction rate and small slump loss. The advantages.
- the researchers of the present invention have found through a large number of experiments that the macromonomer containing a mercapto group can act as a chain transfer agent while participating in the copolymerization, and the chain transfer effect causes cross-linking between different polycarboxylic acid comb-shaped chains, thereby forming Hyperbranched structure.
- the hyperbranched structure of the polycarboxylic acid copolymer has a stronger adsorption capacity on the surface of the cement particles than the polycarboxylic acid comb copolymer, providing a better dispersion effect.
- the inventors of the present invention have found that the use of an RCI species containing both an ester group and a mercapto group as a comonomer is formed.
- the ester group in the hyperbranched structure is easily hydrolyzed under alkaline conditions and slowly released into the water-cement system.
- the function of the lower molecular weight copolymer complements the dispersant consumed by the hydration of the cement, so that the dispersant in the system is always maintained in the critical micelle state, so that the slump does not lose or the loss is small.
- the preparation method of the hyperbranched polycarboxylic acid copolymer cement dispersant of the present invention the radical copolymerization reaction of the monomers A, B and C in an aqueous medium, the monomer A, the monomer B and the monomer C
- Monomer A is represented by the general formula (1): (1) where is a hydrogen atom or a methyl group; X CK CH 2 0, CH 2 CH 2 0 ; m is the average addition mole number of ethylene oxide, which is an integer from 5 to 200;
- Monomer B is represented by the general formula (2):
- R 2 represents H or COOM
- R 3 represents H or CH 3
- M represents H, Na, K or NH 4
- monomer C is represented by the formula (3):
- R4 is a hydrogen atom or a methyl group
- X 2 0, CH 2 0, CH 2 CH 2 0
- Y CH 2 , CH 2 CH 2 , CH (CH 3 ), CH 2 CH 2 CH 2 , CH (CH 3 ) CH 2 , C (CH 3 ) 2
- n is the average addition mole number of ethylene oxide, which is 5 ⁇ An integer of 200.
- Monomer c is a macromonomer containing a mercapto group. While participating in the polymerization, the mercapto group in the molecular structure acts as a chain transfer to the polymerization reaction, and the chain transfer causes the mercapto group side of a comb polymer chain. The chain is attached to the end of the main chain of another comb polymer chain, and this cross-linking occurs multiple times to form a hyperbranched structure.
- the monomer A mainly provides a steric hindrance effect, thereby imparting excellent dispersibility and slump retention properties to the hyperbranched copolymer.
- the unsaturated macromonomer represented by the formula (1) includes: vinyl polyethylene glycol ether, allyl polyethylene glycol ether, methallyl polyglycol ether, 3-methyl-3-butyl En-1-ol-based polyglycol ether. These monomers are either commercially available or can be prepared according to the methods disclosed in the published patents or literature. These monomers are used singly or in combination of one or more of them in any ratio.
- monomer B mainly provides an adsorption group.
- the monomer represented by the formula (2) includes: acrylic acid, methacrylic acid, maleic acid or acrylic acid, methacrylic acid, sodium salt, potassium salt or ammonium salt of maleic acid. These monomers are commercially available and used alone or in a mixture of one or more of any ratio.
- the monomer C is a novel monomer compound, which is a macromonomer containing a mercapto group, and while participating in the polymerization, the mercapto group in the molecular structure acts as a chain transfer to the polymerization reaction. Chain transfer causes cross-linking between different polymer chains to form a hyperbranched structure.
- the monomer C represented by the formula (3) can be produced by esterification of the compound D represented by the formula (4) and the compound E represented by the formula (5).
- Compound D is represented by (4):
- R4 is a hydrogen atom or a methyl group
- X 2 0, CH 2 0, CH 2 CH 2 0
- n is an average addition mole number of ethylene oxide, which is an integer of 5 to 200 ;
- Compound E is represented by the general formula (5):
- the compound D represented by the formula (4) is selected from the group consisting of vinyl polyethylene glycol ether, allyl polyethylene glycol ether, methallyl polyglycol ether, 3-methyl-3- One of the buten-1-ol based polyethylene glycol ethers. These compounds are either commercially available or can be prepared according to the methods disclosed in the published patents or literature. In the present invention, monomer C is obtained by esterification of compound D and compound E.
- esterification reaction process has been reported in the prior art. Such esterification reactions are generally known to those skilled in the art.
- the preparation method can be obtained by esterification reaction of the compound D and the compound E under a small amount of a solvent medium, an acid catalyst and a little polymerization inhibitor.
- the polymerization inhibitor is p-hydroxyanisole, hydroquinone or phenothiazine, and the polymerization inhibitor is used in the reaction system in an amount of 0.02 to 0.1% by weight of the compound D; the catalyst is concentrated sulfuric acid or p-toluenesulfonic acid or solid super Strong acid, the amount of the catalyst in the reaction system is 2 to 5% of the total weight of the compound D and the compound E.
- the esterification reaction temperature is controlled at 100 to 120 ° C for 12 to 30 hours.
- the polymerization reaction of the present invention is carried out in an aqueous system using a redox system as a polymerization initiator, and the redox system oxidant is hydrogen peroxide, and the amount thereof is calculated as 100% concentration of hydrogen peroxide in the monomer A+B+C.
- the total mole number is 1 ⁇ 4; the reducing agent of the redox system is selected from alkali metal sulfite, L-ascorbic acid or sodium formaldehyde sulfoxylate, and the amount is 0.5 ⁇ 2% of the total moles of monomer A+B+C.
- an aqueous solution of the oxidizing agent in the monomer A and the redox initiating system is added to the reaction vessel before the start of the polymerization.
- the aqueous solution of the reducing agent in the monomer B, the monomer C and the redox initiation system is added to the reaction vessel by dropwise addition after the start of the reaction.
- the control is carried out at a higher polymerization concentration of 30 to 60% and a lower polymerization temperature of 30 to 60 ° C, and an aqueous solution of a reducing agent in the monomer B, the monomer C and the redox initiation system.
- the drip time is controlled in 1 ⁇ 4 hours.
- the reaction time was controlled for 2 to 4 hours.
- a basic compound is added to the reactant to adjust the pH to 6.0 to 7.0 to improve the storage stability of the product.
- the basic compound is selected from the group consisting of alkali metal hydroxides, ammonia water, organic amines or a mixture of one or more.
- the weight average molecular weight of the hyperbranched polycarboxylic acid copolymer cement dispersant is controlled to 50,000 140,000. If the molecular weight is too small or too large, its ability to disperse or disperse the cement will decrease.
- the comb copolymer cement dispersant of the present invention When used, the comb copolymer cement dispersant of the present invention is conventionally added in an amount of 0.08% to 0.50% of the total gum. If the amount added is less than 0.08%, the dispersion property is unsatisfactory. On the contrary, if the amount added exceeds 0.5%, the excessive addition proves to be only an economic waste because it does not bring about a corresponding increase in effect.
- the comb copolymer cement dispersant of the present invention may also be combined with at least one selected from the group consisting of sulfamic acid-based water reducing agents, lignin-based ordinary water reducing agents, and existing polycarboxylates. The liquid phase is mixed.
- an air entraining agent a swelling agent, a retarder, an early strength agent, a tackifier, a shrinkage reducing agent, an antifoaming agent and the like may be added.
- the hyperbranched polycarboxylic acid copolymer cement dispersant prepared by the method of the invention has good dispersibility to cement at a lower dosage, high water reduction rate and good slump retention ability.
- the molecular weight of all polymers was determined using aqueous gel permeation chromatography (GPC).
- the experimental conditions are as follows:
- the cement used is Onoda 52.5RR II cement
- the stone is continuous gravel with particle size of 5 ⁇ 20 mm.
- the cement paste fluidity test was carried out according to the GB/T8077-2000 standard. The water addition amount was 87 g. After stirring for 3 minutes, the cement paste fluidity was measured on the flat glass.
- the slump and slump loss shall be implemented in accordance with the relevant provisions of JC473-2001 Concrete Pumping Agent.
- esterification Example C-2 In order to remove the E-1 which is not esterified, the esterified material is first neutralized with a saturated sodium carbonate solution to pH ⁇ 8, E-1 is converted into a salt insoluble in ethyl acetate, and then the esterified product is extracted with ethyl acetate to collect organic After the phase, ethyl acetate was distilled off under reduced pressure, and the obtained solid was dried at 50 ° C for 10 hr in a vacuum oven to obtain a monomer. Esterification Example C-2
- the esterified material is first neutralized with a saturated sodium carbonate solution to pH ⁇ 8, E-2 is converted into a salt insoluble in ethyl acetate, and then the esterified product is extracted with ethyl acetate to collect organic After the phases, ethyl acetate was distilled off under reduced pressure, and the obtained solid was dried at 50 ° C for 10 hr in a vacuum oven to obtain a monomer C-2.
- the esterified material is first neutralized with a saturated sodium carbonate solution to pH ⁇ 8, E-3 is converted into a salt insoluble in ethyl acetate, and then the esterified product is extracted with ethyl acetate to collect organic After the phases, ethyl acetate was distilled off under reduced pressure, and the obtained solid was dried at 50 ° C for 10 hr in a vacuum oven to obtain a monomer C-3.
- Table 2 Synthesis Example and Comparative Example Monomer Code Allyl polyglycol ether
- the reaction was cooled to room temperature and the reaction was neutralized by adding 33.3 g of 30% NaOH solution to pH.
- the polymer was composed of an aqueous polymer solution having a weight average molecular weight of 80,600 and a polymer weight concentration of 39.8%.
- the reaction was cooled to room temperature and the reaction was neutralized by adding 58.4 g of 30% NaOH solution to pH.
- the polymer was composed of an aqueous polymer solution having a weight average molecular weight of 90,500 and a polymer concentration of 49.8% by weight.
- the reaction was cooled to room temperature and the reaction was neutralized with a solution of 13.0 g of 30% NaOH and 16.7 g of triethanolamine to pH.
- the polymer was composed of an aqueous polymer solution having a weight average molecular weight of 108000 and a polymer concentration of 49.5% by weight.
- the reaction was cooled to room temperature and the reaction was neutralized with a solution of 21.6 g of 30% NaOH to pH.
- the polymer was composed of an aqueous polymer solution having a weight average molecular weight of 135,000 and a polymer concentration of 49.3% by weight. Comparative example 1
- This comparative example is directed to Synthesis Example 2, replacing the monomer C with an equimolar amount of 3-mercaptopropionic acid: 100 g of A-2 (0.05 mol), 0.46 g of a glass flask equipped with a thermometer, a stirrer, and a nitrogen inlet tube. Hydrogen peroxide (0.004 mol) and 80.0 g of water were heated to 45 ° C under nitrogen, and dissolved by stirring. A mixture containing 10.8 g of Bl (0.15 mol), 0.77 g of 3-mercaptopropionic acid (0.0073 mol), 0.17 g of L-ascorbic acid (0.01 mol) and 40.0 g of water was added dropwise, and the dropwise addition time was 2 hours.
- the reaction was kept at this temperature for 2 hours.
- the reaction was cooled to room temperature and the reaction was neutralized with a solution of 18.0 g 30% NaOH to pH 7.
- the polymer was composed of an aqueous polymer solution having a weight average molecular weight of 32,000 and a polymer concentration of 49.5% by weight. Comparative example 2
- This comparative example is directed to Synthesis Example 2, changing the molar ratio of monomer C to all monomers to be 0.01 ( ⁇ 0.02): 100 g of A-2 (0.05 mol) was placed in a glass flask equipped with a thermometer, a stirrer, and a nitrogen inlet tube. ), 0.46 g of 30% hydrogen peroxide (0.004 mol) and 80.0 g of water were heated to 45 ° C under nitrogen, and stirred to dissolve. A mixture containing 10.8 g of Bl (0.15 mol), 4.2 g of C-2 (0.002 mol), 0.17 g of L-ascorbic acid (0.01 mol) and 40.0 g of water was added dropwise, and the dropping time was 2 hours.
- the reaction was kept at this temperature for 2 hours.
- the reaction was cooled to room temperature and the reaction was neutralized by adding 18.0 g of 30% NaOH solution to pH.
- the polymer is water soluble td from a polymer having a weight average molecular weight of 58,000.
- Liquid composition polymer weight concentration is 47.2%
- the reaction was kept at this temperature for 2 hours.
- the reaction was cooled to room temperature and the reaction was neutralized to pH 7 with 18.0 g of 30% NaOH.
- the polymer consists of an aqueous polymer solution having a weight average molecular weight of 178,000 and a polymer concentration of 48.7% by weight.
- Example 1 A-1 Bl Cl 2 0.026 47.5 51000 Example 2 A-2 Bl C-2 3 0.035 49.2 88000 Example 3 A-3 Bl C-3 3 0.020 34.7 101000 Example 4 A-2 B-2 C -2 5 0.020 39.8 80600 Example 5 A-2 B-2 Cl 10 0.020 49.8 90500 Example 6 A-2 B-3 C-3 3 0.020 57.9 82500 Example 7 A-1, A-2 Bl C-2 3 0.041 49.5 108000 Example 8 A-1, A-3 C-2 3 0.077 49.3 135000 Comparative Example 1 A-2 Bl 1 3 1 49.5 32000 Comparative Example 2 A-2 Bl C-2 3 0.010 47.2 58000 Comparative Example 3 A-2 Bl C-2 3 0.150 48.7 178000 Application Embodiment Application Example 1
- the cement paste fluidity test was carried out according to the GB/T8077-2000 standard, 300 g of cement, 87 g of water added, and stirred.
- the data in Table 4 shows that the hyperbranched polycarboxylic acid copolymer prepared by the present invention has a good dispersibility and dispersion retention ability for cement at a lower dosage.
- Example 2 By comparing Example 2 and Comparative Examples 2 and 3, it can be seen that when the ratio of monomer C is too low, an effective hyperbranched structure cannot be formed, and at this time, the liquidity retention ability of the slurry is poor; when the ratio of monomer C is too high The molecular weight of the hyperbranched copolymer is too large, which affects its adsorption on the surface of the cement particles. Therefore, a higher dosage is required to achieve the same initial slurry fluidity as in Example 2, but it still has a good fluidity. Maintain ability. From the above comparison, it was found that the hyperbranched polycarboxylic acid copolymer cement dispersant prepared by the present invention can obtain better cement dispersibility at a lower dosage and has better dispersion retention properties.
- Example 1 0.15 225 235
- Example 2 0.15 255 275
- Example 3 0.15 235 295
- Example 4 0.15 240 260
- Example 5 0.15 245 275
- Example 6 0.15 235 290
- Example 7 0.15 265 280
- Example 8 0.15 230 250 Comparative Example 1 0.20 255 205 Comparative Example 2 0.18 250 215 Comparative Example 3 0.30 255 280
- This application example selects the hyperbranched polymer synthesized in Example 2 as an example to investigate the high temperature retention properties of the hyperbranched polymer. It is relatively easy to maintain the slump of high fluidity concrete, while the medium and low flow concrete has high requirements for slump retention performance. Therefore, it is of great practical significance to investigate the preservation performance of medium and low flow concrete at high temperature. .
- the test results are shown in Table 5.
- Example 2 0.15 14.2 15.5 14.8 Comparative Example 1 0.20 14.5 9.2 6.5 Comparative Example 2 0.18 14.8 10.9 8.6 Comparative Example 3 0.30 14.2 15.5 16.0 Experimental results show that the polymer of the polymer prepared in Comparative Example 1 was prolonged with time. The slump loss is very high in high temperature environment, and it has lost more than 50% in 60 minutes. The concrete prepared by the polymer obtained in Comparative Example 2 had a large loss of slump in a high temperature environment with a prolonged time, and lost more than 40% in 60 minutes. The polymer of the polymer prepared in Comparative Example 3 has a higher slump retention ability in the high temperature environment over time, but the required amount of the concrete is higher.
- the concrete prepared by using the polymer obtained in Example 2 has a good slump retention ability in a high temperature environment and a low blending amount. It can be seen that the hyperbranched polymer produced by the present invention allows the disposed concrete to have a longer slump retention capability at a lower dosage.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2013545001A JP5594708B2 (ja) | 2010-12-22 | 2010-12-22 | ハイパーブランチ型ポリカルボン酸系ポリマー・セメント分散剤の調製方法 |
US13/807,723 US9175122B2 (en) | 2010-12-22 | 2010-12-22 | Preparation method of hyperbranched polycarboxylic acid containing copolymer cement dispersant |
PCT/CN2010/080133 WO2012083536A1 (zh) | 2010-12-22 | 2010-12-22 | 超支化型聚羧酸类共聚物水泥分散剂的制备方法 |
EP10861094.0A EP2657264B1 (en) | 2010-12-22 | 2010-12-22 | Preparation method of hyperbranched polycarboxylic acid type copolymer cement dispersant |
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PCT/CN2010/080133 WO2012083536A1 (zh) | 2010-12-22 | 2010-12-22 | 超支化型聚羧酸类共聚物水泥分散剂的制备方法 |
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EP2937321A4 (en) * | 2012-12-05 | 2016-11-16 | Sobute New Materials Co Ltd | SUPERPLASTIFIANT POLY (CARBOXYLIC ACID) NOW BREAKING |
CN112175148A (zh) * | 2020-09-22 | 2021-01-05 | 德州中科新材料有限公司 | 一种交联型早强羧酸减水剂、其制备方法及其应用 |
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CN116333231B (zh) * | 2023-05-25 | 2023-08-18 | 中建材中岩科技有限公司 | 一种超高分散型减水剂及其制备方法 |
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US9175122B2 (en) | 2015-11-03 |
US20130102749A1 (en) | 2013-04-25 |
JP5594708B2 (ja) | 2014-09-24 |
EP2657264A1 (en) | 2013-10-30 |
JP2014501690A (ja) | 2014-01-23 |
EP2657264A4 (en) | 2014-10-08 |
EP2657264B1 (en) | 2016-03-02 |
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